Row Echelon Form Calculator
Convert a 2x3 or 3x4 augmented matrix to row echelon form using Gaussian elimination with step-by-step operations.
New Calculators
Our 200 most recently added calculators, organized by category.
Math32 calculators
Percentage, fraction, algebra, and statistics calculators for students and professionals.
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Vertex Form Calculator
Convert y = ax² + bx + c to vertex form y = a(x-h)² + k. Find the vertex, axis of symmetry, and direction of the parabola.
Perimeter Calculator
Calculate the perimeter of common shapes: rectangle, triangle, circle (circumference), and regular polygon. Also shows the area as a bonus.
Partial Fraction Calculator
Decompose a rational expression into partial fractions. Handles distinct linear factors for degree-2 denominators of the form (x - a)(x - b).
Law of Sines Calculator
Solve triangles using the law of sines. Find unknown sides and angles from one side, its opposite angle, and another angle.
Distance Between Points Calculator
Calculate the distance between two points in 2D or 3D space using the Euclidean distance formula.
Centroid Calculator
Calculate the centroid (center of mass) of a triangle from three vertex coordinates. Shows the average of x and y values.
Triangular Prism Surface Area Calculator
Calculate the total surface area of a triangular prism with detailed breakdown of lateral area, base area, and each individual face.
Triangular Pyramid Volume Calculator
Calculate the volume of a triangular pyramid (tetrahedron) from base area and height, or from base triangle dimensions.
Surface Area Rectangular Prism Calculator
Calculate the total and lateral surface area of a rectangular prism (box) from length, width, and height.
Ratio of 3 Numbers Calculator
Simplify a three-part ratio to its lowest terms, find percentages, and scale to any total.
Rectangular Prism Calculator
Calculate the volume, surface area, and space diagonal of a rectangular prism (box) from its length, width, and height.
Rhombus Calculator
Calculate the area, perimeter, diagonals, angles, and side length of a rhombus from the inputs you have.
Prime Number Calculator
Check if a number is prime and find its prime factorization. Also shows the nearest primes and divisor count.
Secant Cosecant Calculator
Calculate sec, csc, and cot for any angle. Supports degrees and radians with full reciprocal trig values.
FOIL Calculator
Multiply two binomials using the FOIL method. Shows First, Outer, Inner, Last terms and the simplified result.
XOR Calculator
Perform bitwise XOR on two numbers. Supports decimal, binary, and hexadecimal input and output.
Half Angle Calculator
Calculate sin(θ/2), cos(θ/2), and tan(θ/2) using half-angle identities. Supports degrees and radians.
Diagonal of Rectangle Calculator
Calculate the diagonal length of a rectangle from its width and height using the Pythagorean theorem.
Unit Rate Calculator
Calculate the unit rate from any ratio. Find price per unit, speed per hour, or any rate with denominator of 1.
Null Space Calculator
Find the null space (kernel) of a 2x2 or 3x3 matrix. Determines the set of vectors x where Ax = 0.
Square Diagonal Calculator
Calculate the diagonal of a square from its side length, or find the side length from the diagonal.
Eigenvalue Calculator
Calculate eigenvalues and eigenvectors of a 2x2 or 3x3 matrix. Shows the characteristic polynomial and step-by-step solution.
LU Decomposition Calculator
Decompose a 2x2 or 3x3 matrix into lower (L) and upper (U) triangular matrices using Doolittle's method.
Root Mean Square Calculator
Calculate the RMS (root mean square) value from a set of numbers. Used in statistics, physics, and electrical engineering.
Reference Angle Calculator
Find the reference angle for any angle in degrees or radians. Shows the quadrant and all coterminal trig values.
Gradient Calculator
Calculate the gradient (slope) between two points on a line. Find rise, run, angle, and percentage gradient.
Two's Complement Calculator
Convert between decimal and two's complement binary representation for 8-bit, 16-bit, or 32-bit integers.
Finance34 calculators
Mortgage, loan, interest, investment, and salary calculators for personal finance.
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Opportunity Cost Calculator
Calculate the opportunity cost of a financial decision by comparing the return you could earn on an alternative investment over time.
Current Ratio Calculator
Calculate the current ratio to measure a company's ability to pay short-term obligations. A standard liquidity metric with a healthy range of 1.5-3.0.
Life Insurance Calculator
Estimate how much life insurance coverage you need using the DIME method. Factor in debt, income replacement, mortgage, and education costs.
Net to Gross Calculator
Reverse-engineer the gross pay needed to achieve a desired net (take-home) pay after taxes and deductions.
Sales Tax Calculator
Calculate sales tax amount, total price with tax, or determine the pre-tax price from a total.
Net Debt Calculator
Calculate net debt by subtracting cash and cash equivalents from total debt. A key metric for evaluating company financial health.
Price-to-Sales Ratio Calculator
Calculate the P/S ratio to value a stock relative to its revenue. Enter market cap and annual revenue, or use per-share figures for the same result.
Hourly to Salary Calculator
Convert your hourly wage to an equivalent annual salary, monthly, biweekly, and weekly income based on your work schedule.
RMD Calculator
Calculate your Required Minimum Distribution from retirement accounts using IRS Uniform Lifetime Table factors.
CD Rate Calculator
Calculate certificate of deposit returns using the compound interest formula. Compare CD terms and rates, and see total interest earned over the deposit period.
Discount Calculator
Calculate the final price after a discount. See your savings amount, final price, and price per unit after single or stacked discounts.
DCF Calculator
Calculate enterprise value using the Discounted Cash Flow model. Project future cash flows, estimate terminal value, and find the present value of a business.
Capital Gains Tax Calculator
Estimate your capital gains tax on investments, real estate, or other assets.
Post-Judgment Interest Calculator
Calculate post-judgment interest on court awards. Enter the judgment amount, interest rate, and dates to find total interest owed.
PPP Calculator
Calculate Purchasing Power Parity to compare how far your money goes in different countries. Convert costs using PPP exchange rates.
NPS Calculator
Calculate your Net Promoter Score from survey responses. Enter the number of promoters, passives, and detractors to see your NPS instantly.
Mega Millions Payout Calculator
Calculate your Mega Millions after-tax payout for lump sum and annuity options. See federal and state tax impact on any jackpot.
Vendor Markup Calculator
Calculate vendor markup percentage and compare wholesale to retail pricing. Find the markup, margin, and profit on products you resell.
Blended Rate Calculator
Calculate the weighted average interest rate across multiple loans. See your combined blended rate and total monthly payment.
Prorated Salary Calculator
Calculate prorated salary for partial pay periods. Enter your annual salary, start or end date, and pay period to find the adjusted amount.
Lottery Annuity Calculator
Compare lottery lump sum vs annuity payments over 30 years. See the after-tax value of each option to make a smarter decision.
Florida Sales Tax Calculator
Calculate Florida sales tax including the 6% state rate plus county discretionary surtax. Enter your county to get the exact combined rate.
Mileage Reimbursement Calculator
Calculate IRS mileage reimbursement for business, medical, or charity driving. Uses the 2025 rate of $0.70/mile for business.
Savings Withdrawal Calculator
Calculate how long your savings will last with regular withdrawals, accounting for interest earned on the remaining balance.
Year Over Year Growth Calculator
Calculate YoY growth rate between two periods. Enter this year's and last year's values to find the percentage change.
California Sales Tax Calculator
Calculate California sales tax with the 7.25% base rate plus district taxes. See the total tax and final price for purchases in any CA location.
Money Counter Calculator
Count your bills and coins to get a total dollar amount. Enter the quantity of each denomination and see the grand total instantly.
California Tax Calculator
Estimate your California state income tax with 2025 brackets. See your CA tax owed, effective rate, and marginal bracket by filing status.
Health & Fitness39 calculators
BMI, calorie, body fat, and nutrition calculators for health-conscious individuals.
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Cardiac Output Calculator
Calculate cardiac output from heart rate and stroke volume. Also shows cardiac index when body surface area is provided.
Dunk Calculator
Find out if you can dunk a basketball. Enter your height and arm length to calculate your standing reach and the vertical jump you need to throw it down.
Alcohol Dilution Calculator
Calculate how much water to add to dilute spirits or high-proof alcohol to a target ABV using the standard dilution formula.
Anion Gap Calculator
Calculate the serum anion gap and albumin-corrected anion gap from sodium, chloride, bicarbonate, and albumin lab values.
BMI Prime Calculator
Calculate your BMI Prime, the ratio of your BMI to the upper limit of normal BMI (25), for a quick assessment of weight status.
Peptide Dosage Calculator
Calculate reconstitution volume and injection dosing for research peptides. Given vial amount, water volume, and desired dose, find the injection volume in units and mL.
Rowing Calorie Calculator
Estimate calories burned rowing based on intensity, body weight, and duration. Includes MET-based and watts-based calculations.
ANC Calculator
Calculate Absolute Neutrophil Count from white blood cell count and neutrophil differential to assess immune function and neutropenia risk.
HOMA-IR Calculator
Calculate Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) from fasting insulin and fasting glucose levels.
Pace Converter
Convert between running/walking pace formats: min/km, min/mile, km/h, and mph with race time predictions for common distances.
BUN/Creatinine Ratio Calculator
Calculate the BUN-to-creatinine ratio to help distinguish prerenal azotemia from intrinsic renal causes of kidney injury.
AST/ALT Ratio Calculator
Calculate the De Ritis ratio (AST/ALT) for liver disease differential diagnosis. Helps distinguish between alcoholic and non-alcoholic liver conditions.
Berg Balance Test Calculator
Score the Berg Balance Scale (BBS) with all 14 items. Total score from 0 to 56 assesses fall risk in older adults and neurological patients.
Dog Chocolate Toxicity Calculator
Calculate theobromine dose and toxicity risk when your dog eats chocolate. Covers milk, dark, baker's, and white chocolate types.
Earned Run Average Calculator
Calculate a baseball pitcher's ERA from earned runs and innings pitched using the official MLB formula.
Wedding Alcohol Calculator
Estimate how much beer, wine, and liquor to buy for your wedding reception based on guest count, event duration, and drinking habits.
REM Sleep Calculator
Calculate ideal bedtime and wake-up times to maximize REM sleep cycles. REM sleep increases in later cycles, typically peaking in the 4th and 5th 90-minute cycles.
Dog Size Calculator
Estimate your puppy's adult weight based on current weight, age, and breed size category. Uses growth curve multipliers for small, medium, large, and giant breeds.
RCRI Calculator
Calculate Revised Cardiac Risk Index (Lee Index) to estimate perioperative cardiac risk for patients undergoing non-cardiac surgery.
Turkey Cooking Time Calculator
Calculate turkey roasting time and temperature from weight. Covers unstuffed and stuffed turkeys with rest time included.
Tree Value Calculator
Estimate tree value using the trunk formula method based on species, trunk diameter, condition, and location.
Batting Average Calculator
Calculate a baseball player's batting average from hits and at-bats. Includes OBP estimate, hit breakdown, and historical context.
Tinetti Calculator
Score the Tinetti Balance and Gait Assessment (POMA) to evaluate fall risk in older adults. Scores range from 0-28.
Free Testosterone Calculator
Estimate free and bioavailable testosterone from total testosterone, SHBG, and albumin using the Vermeulen method.
MCA Calculator
Calculate middle cerebral artery peak systolic velocity (MCA-PSV) multiples of the median (MoM) for fetal anemia screening by gestational age.
Implantation Calculator
Estimate when embryo implantation is most likely to occur based on your ovulation date or last menstrual period.
Sourdough Calculator
Calculate sourdough bread ingredient amounts from flour weight, hydration percentage, starter percentage, and salt percentage.
Swine Gestation Calculator
Calculate the expected farrowing date from a sow's breeding date. Average swine gestation is 114 days (3 months, 3 weeks, 3 days).
Physics24 calculators
Mechanics, energy, electricity, and motion calculators for physics students.
Angular Velocity Calculator
Convert between rad/s, RPM, and deg/s. Calculate linear velocity from angular velocity and radius.
Rotational Kinetic Energy Calculator
Calculate rotational kinetic energy using KE = 1/2 I omega squared. Convert between RPM and rad/s for angular velocity.
Specific Gravity Calculator
Calculate specific gravity from substance density and reference density (water at 4°C).
Sun Angle Calculator
Calculate solar elevation and azimuth angle from latitude, day of year, and time of day.
Air Density Calculator
Calculate air density from temperature, atmospheric pressure, and relative humidity using the ideal gas law.
Thermal Resistance Calculator
Calculate thermal resistance for heat sinks and material layers. Find junction temperature from power dissipation.
KVA Calculator
Calculate kilovolt-amperes (kVA) from voltage and current for single-phase and three-phase electrical systems. Convert between kVA, kW, and amps.
Spring Rate Calculator
Calculate coil spring rate from wire diameter, coil diameter, number of active coils, and material shear modulus.
Friction Loss Calculator
Calculate friction loss in pipes using the Hazen-Williams formula. Enter flow rate, pipe diameter, length, and material for pressure drop in PSI.
Crossover Calculator
Calculate audio crossover component values (capacitor and inductor) for first and second-order speaker crossover networks.
Relative Humidity Calculator
Calculate relative humidity from air temperature and dew point temperature using the Magnus formula.
Magnetic Declination Calculator
Calculate approximate magnetic declination from geographic coordinates using a simplified dipole model.
Contact Lens Vertex Calculator
Calculate contact lens power from spectacle prescription using vertex distance correction. Essential for prescriptions over +/-4.00 diopters.
Low Pass Filter Calculator
Design passive RC or RL low-pass filters. Calculate cutoff frequency, component values, and attenuation.
True Airspeed Calculator
Calculate true airspeed (TAS) from indicated airspeed (IAS), pressure altitude, and outside air temperature for aviation flight planning.
Quarter Mile Calculator
Estimate quarter-mile elapsed time and trap speed from vehicle horsepower and weight using the Brock Yates / Roger Huntington formula.
G-Force Calculator
Calculate g-force from velocity change and time, or from circular motion radius and speed.
Wet Bulb Calculator
Calculate wet-bulb temperature from dry-bulb temperature and relative humidity. Assess heat stress risk and human survivability limits.
Dipole Calculator
Calculate half-wave dipole antenna length from frequency. Find total length and each leg for common ham and commercial bands.
Watt Hours Calculator
Calculate energy in watt-hours from power (watts) and time. Convert to kilowatt-hours and estimate electricity cost.
Belt Length Calculator
Calculate V-belt or flat belt length from pulley diameters and center distance.
Foot Pounds of Energy Calculator
Calculate kinetic energy in foot-pounds from projectile weight (grains) and velocity (fps). Also shows Joules and momentum.
Sunrise Sunset Calculator
Calculate sunrise and sunset times from latitude, longitude, and date using solar position equations.
Earth Curvature Calculator
Calculate how much the Earth curves over a given distance and how much of a distant object is hidden below the horizon.
Everyday Life24 calculators
Age, date, time, fuel, cooking, and grade calculators for daily use.
Graduation Year Calculator
Find your expected high school or college graduation year based on current grade level and school year.
Meeting Cost Calculator
Calculate the true cost of meetings based on attendees, hourly rates, and duration.
eDPI Calculator
Calculate your effective DPI for gaming. Compare mouse sensitivity setups and find your cm/360.
Fuel Cost Calculator
Calculate the fuel cost of a trip based on distance, fuel efficiency, and fuel price.
RPM Calculator
Calculate revolutions per minute from speed and wheel or gear diameter. Convert between RPM, surface speed, and diameter.
Road Trip Cost Calculator
Calculate fuel cost, gallons needed, cost per person, and estimated drive time for a road trip.
TV Series Duration Calculator
Calculate the total watch time of a TV series and how long it takes to binge.
Drive Time Calculator
Calculate driving time from distance and average speed. See hours, minutes, and arrival time for your trip.
GPA Calculator
Calculate your Grade Point Average. Enter letter grades and credit hours for up to 6 courses.
Fabric Calculator
Calculate fabric yardage needed from project dimensions and pattern repeat. Works for upholstery, curtains, garments, and general sewing projects.
Time Lapse Calculator
Calculate interval, total frames, and playback duration for time-lapse photography. Plan your shoot from real-time duration to final video length.
Antipode Calculator
Calculate the antipodal (diametrically opposite) point on Earth from any coordinates. Find what is on the other side of the world.
TV Mounting Height Calculator
Calculate the ideal TV mounting height based on screen size, viewing distance, and seating position.
Quilt Calculator
Calculate fabric yardage needed for quilt blocks, sashing, and borders. Enter quilt size and block dimensions to get a full cutting plan.
Vocal Range Calculator
Determine your vocal range and voice type from your lowest and highest comfortable notes.
K/D Calculator
Calculate your kill/death ratio and related gaming statistics. See KDA, kills needed for a target ratio, and performance metrics.
Semitone Calculator
Calculate frequency ratios and intervals between musical notes in semitones. Convert between note names and frequencies.
Chmod Calculator
Convert between chmod numeric (octal) and symbolic permission notation. Set read, write, and execute for owner, group, and others.
Pixels Per Inch Calculator
Calculate PPI from screen resolution and display size. Compare pixel density across monitors, phones, and tablets.
Chord Calculator
Calculate musical chord notes and intervals from a root note. See notes for major, minor, 7th, diminished, augmented, and suspended chords.
Turbo Size Calculator
Calculate turbo sizing from engine displacement and target boost. Find the right compressor for your power goals.
0-60 MPH Calculator
Estimate 0-60 mph time from vehicle horsepower, weight, and drivetrain. Compare stock and modified setups.
Price Per Pound Calculator
Calculate and compare price per pound for different products. Find the best deal when buying meat, produce, or bulk items.
Wheel Offset Calculator
Calculate wheel offset, backspacing, and fitment changes when switching wheel widths. Compare old and new wheel setups for vehicle clearance.
Construction18 calculators
Area, volume, concrete, paint, and tile calculators for builders and DIYers.
Concrete Calculator
Calculate how much concrete you need for a slab. Enter length, width, and depth to get cubic yards and number of bags.
Board and Batten Calculator
Calculate materials for board and batten siding or wainscoting. Get the number of boards, battens, total linear feet, and coverage area.
Spindle Speed Calculator
Calculate spindle RPM from cutting speed and tool or workpiece diameter. Covers milling, turning, and drilling operations with common material presets.
Room Area Calculator
Calculate the area of rectangular, L-shaped, and U-shaped rooms. Enter your room dimensions to get total area in square feet and square meters plus perimeter.
Cubic Feet Calculator
Calculate volume in cubic feet for boxes, rooms, and cylinders. Get results in cubic feet, cubic yards, cubic meters, and gallons with a quantity multiplier.
Rolling Offset Calculator
Calculate pipe rolling offset travel, run, and true offset for plumbing and pipefitting. Supports 22.5, 45, and 60 degree fittings.
Soil Calculator
Calculate how much soil or topsoil you need for garden beds, raised planters, and landscaping. Get volume in cubic yards, bags needed, and weight estimates.
Area Calculator
Calculate the area of rectangles, circles, and triangles. Select a shape and enter the dimensions.
CFM Airflow Calculator
Calculate required CFM (cubic feet per minute) airflow for HVAC systems based on room size and air changes per hour. Includes recommended duct size.
Caulk Calculator
Calculate how many caulk tubes you need for windows, doors, and trim joints. Enter joint dimensions and total length for an accurate materials estimate.
Deck Stain Calculator
Calculate how much deck stain to buy based on deck area, coverage rate, and number of coats. Get gallons needed and estimated cost.
Aggregate Calculator
Calculate aggregate volume and weight for construction fill, road base, and drainage. Enter area dimensions and depth to get cubic yards and tons.
Limestone Calculator
Calculate how much limestone you need by volume and weight. Enter area and depth for driveways, base layers, and landscaping.
Sag Ratio Calculator
Calculate cable or wire sag based on span length, unit weight, and horizontal tension. Get sag distance, sag ratio, and actual cable length.
True Position Calculator
Calculate GD&T true position from X and Y deviations. Determine if a feature passes or fails its tolerance zone.
Vapor Barrier Calculator
Calculate vapor barrier square footage needed for crawl spaces, basement walls, and concrete floors. Accounts for overlaps and waste.
Tonnage Calculator
Calculate material tonnage from volume and density. Convert cubic yards or cubic feet to tons for gravel, sand, soil, and other bulk materials.
Bearing Load Calculator
Calculate bearing load capacity and L10 life expectancy from dynamic load rating, applied load, and speed. Covers radial ball and roller bearings.
Conversion11 calculators
Length, weight, temperature, speed, and data unit converters.
Steps to Miles Calculator
Convert steps to miles, kilometers, and calories burned based on your stride length.
Binary to Hexadecimal Calculator
Convert between binary and hexadecimal number systems. Also shows decimal and octal equivalents.
Inch Pounds to Foot Pounds Calculator
Convert torque between inch-pounds and foot-pounds. Also shows newton-meters for metric reference.
Inches to Centimeters Converter
Convert inches to centimeters, millimeters, meters, and feet with exact conversion factors.
Cents to Dollars Calculator
Convert cents to dollars and count coins. Enter a total in cents or individual coin counts to get the dollar amount.
Quarts to Gallons Converter Calculator
Convert between quarts and gallons. Also shows liters, pints, cups, and fluid ounces.
Gallons to Pounds Calculator
Convert gallons to pounds for water and common liquids. Select your liquid for an accurate weight based on its density.
Weeks to Months Calculator
Convert weeks to months, days, and years. Uses the average month length of 4.34524 weeks.
Tbsp to Grams Calculator
Convert tablespoons to grams for common cooking and baking ingredients. Pick your ingredient for an accurate weight conversion.
Pennies to Dollars Calculator
Convert pennies to dollars, quarters, dimes, nickels, and coin roll counts.
Pixels to Inches Calculator
Convert pixels to inches and inches to pixels at any DPI. Essential for print design, screen layout, and image sizing.
Chemistry2 calculators
Molarity, dilution, and pH calculators for chemistry students and lab workers.
Concentration Converter Calculator
Convert between concentration units: molarity, mass percent, ppm, ppb, and mg/L. Uses molecular weight and solution density for accurate conversions.
Combustion Analysis Calculator
Determine the empirical formula of an organic compound from combustion analysis data (CO₂ and H₂O produced).
Statistics16 calculators
Probability, combination, permutation, and z-score calculators for data analysis.
Mean Absolute Deviation Calculator
Calculate the Mean Absolute Deviation (MAD) from up to 10 data values. Shows the average distance from the mean.
Mode Calculator
Find the mode (most frequent value) of a dataset, determine if it is unimodal, bimodal, or multimodal, and see the frequency of each value.
Statistical Range Calculator
Calculate the range, mid-range, and coefficient of range from your dataset to measure the spread between the minimum and maximum values.
Relative Standard Deviation Calculator
Calculate the relative standard deviation (%RSD) from a data set. RSD equals (standard deviation / mean) × 100.
95% Confidence Interval Calculator
Calculate a 95% confidence interval for a population mean from sample data. Uses z-score (1.96) for large samples or t-score for small samples.
Inverse Normal Distribution Calculator
Find the z-score or x-value for a given cumulative probability. Calculates the inverse CDF (quantile function) of the normal distribution.
T-Test Sample Size Calculator
Calculate the required sample size for a t-test given effect size, significance level (alpha), and desired statistical power.
Geometric Probability Calculator
Calculate geometric distribution probabilities. Find the probability of first success on trial k, cumulative probabilities, and expected value.
Quartic Regression Calculator
Fit a quartic polynomial (y = ax⁴ + bx³ + cx² + dx + e) to data points using least squares regression.
Quadratic Regression Calculator
Fit a quadratic curve (y = ax² + bx + c) to data points using the least squares method. Get R-squared and predictions.
Simpson's Diversity Index Calculator
Calculate Simpson's diversity index (D), Simpson's index of diversity (1-D), and Simpson's reciprocal index (1/D) from species counts.
Cohen's D Calculator
Calculate Cohen's d effect size from two group means and standard deviations. Includes pooled SD, Hedges' g correction, and effect size interpretation.
Least to Greatest Calculator
Sort a list of numbers from smallest to largest. Also shows the range, minimum, maximum, and count.
Sample Variance Calculator
Calculate sample variance and population variance from a comma-separated data set. Also shows standard deviation and mean.
Implied Probability Calculator
Convert betting odds (American, decimal, fractional) to implied probability. Compare the true probability to find value bets.
U-Test Calculator
Perform the Mann-Whitney U test for comparing two independent samples. A nonparametric alternative to the two-sample t-test.