Round numbers to decimal places, nearest values, or use ceiling, floor, and truncate methods. See step-by-step rounding explanations.
You might also find these calculators useful
Count significant figures and round numbers to a specified precision
Convert numbers to/from scientific notation and perform operations
Find measurement accuracy using the percent error formula.
Calculate percentages, percentage change, and more
Round numbers using standard rounding, ceiling, floor, truncate, or to the nearest value. See detailed steps and understand different rounding methods. Essential for data analysis, finance, and everyday calculations.
Rounding reduces the number of digits while keeping the value close to the original. Standard rounding looks at the next digit: if 5 or more, round up; if less than 5, round down. Other methods include ceiling (always up), floor (always down), and truncate (toward zero).
Standard Rounding Rule
Round currency values to cents or whole dollars.
Simplify numbers for reports and presentations.
Round prices to psychological price points.
Express measurements with appropriate precision.
Round to any number of decimal places
Round to nearest 5, 10, 0.25, or any value
Use ceiling, floor, or truncate methods
See step-by-step rounding process
Compare different rounding results
Floor always rounds toward negative infinity (down for positive, more negative for negative numbers). Truncate rounds toward zero (removes decimals). For positive numbers they're the same, but floor(-2.5)=-3 while trunc(-2.5)=-2.
Use 'Round to Nearest' mode and enter 0.05 as the nearest value. For example, 3.27 rounded to nearest 0.05 becomes 3.25.
Banker's rounding (round half to even) rounds .5 to the nearest even number. This reduces bias over many calculations. For example, 2.5 rounds to 2, but 3.5 rounds to 4.
Use 'Round to Decimal Places' mode and set decimal places to 0. For example, 3.7 rounds to 4 and 3.4 rounds to 3. To always round up use Ceiling, to always round down use Floor, and to drop the decimals use Truncate.