# Speed, Distance & Time Calculator

Free online speed, distance, and time calculator. Use the formula v = d/t to solve for any variable. Perfect for physics homework, travel planning.

## What this calculates

The speed-distance-time relationship is one of the most fundamental concepts in physics and everyday life. Whether you are calculating how long a road trip will take, determining the speed of a moving object, or figuring out the distance covered during a run, this calculator uses the core kinematic equation v = d/t to solve for whichever variable you need.

## Inputs

- **Solve For** — options: Speed (v), Distance (d), Time (t)
- **Speed** (m/s) — min 0
- **Distance** (m) — min 0
- **Time** (s) — min 0

## Outputs

- **Result** — Calculated value for the selected variable
- **Unit** — formatted as text
- **Formula Used** — formatted as text

## Details

The formula v = d / t relates three quantities: speed (v), distance (d), and time (t). Rearranging this equation lets you solve for any one of the three when the other two are known:

  - Speed: v = d / t

  - Distance: d = v x t

  - Time: t = d / v

This relationship assumes constant speed (no acceleration). For cases involving acceleration, see the projectile motion or force calculators. The default units are meters and seconds, giving speed in meters per second (m/s). To convert to km/h, multiply by 3.6; to convert to mph, multiply by 2.237.

Applications include travel time estimation, athletic performance analysis, engineering calculations, and any scenario where uniform motion is a reasonable assumption.

## Frequently Asked Questions

**Q: What is the formula for speed, distance, and time?**

A: The core formula is v = d / t, where v is speed, d is distance, and t is time. You can rearrange it to find distance (d = v x t) or time (t = d / v).

**Q: What is the difference between speed and velocity?**

A: Speed is a scalar quantity that measures how fast an object is moving regardless of direction. Velocity is a vector quantity that includes both magnitude and direction. This calculator computes speed (scalar).

**Q: How do I convert m/s to km/h?**

A: Multiply meters per second by 3.6 to get kilometers per hour. For example, 10 m/s = 36 km/h.

**Q: Does this calculator account for acceleration?**

A: No, this calculator assumes constant speed (uniform motion). For problems involving acceleration, use the projectile motion calculator or apply the full kinematic equations.

**Q: Can I use this for light-speed calculations?**

A: You can input any values, including the speed of light (approximately 299,792,458 m/s). However, at relativistic speeds, Newtonian mechanics breaks down and special relativity must be used for accurate results.

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Source: https://vastcalc.com/calculators/physics/speed-distance-time
Category: Physics
Last updated: 2026-04-21