Rounding Calculator
Round any number to a specified place value or number of significant figures. This calculator handles whole-number rounding (ones, tens, hundreds, thousands), decimal rounding (tenths, hundredths, thousandths), and significant figures rounding.
Rounding simplifies numbers by reducing digits while keeping the value close to the original. The standard rule is: if the digit to the right of the rounding position is 5 or greater, round up; otherwise, round down. For example, 3.456 rounded to the hundredths place becomes 3.46.
Significant figures rounding preserves a specific number of meaningful digits regardless of the decimal point position. For example, 0.004567 rounded to 3 significant figures is 0.00457, and 45670 rounded to 3 significant figures is 45700.
Rounding is essential in science (reporting measurements with appropriate precision), finance (currency calculations), engineering (tolerances and specifications), and everyday arithmetic (estimating costs, distances, and quantities). Understanding when and how to round prevents false precision in reported results.