Rounding Calculator
Round a number to a chosen decimal place, significant figures, or nearest unit (10s, 100s, etc.).
- Round (half-up)3.14
- Floor (down)3.14
- Ceiling (up)3.15
- Truncate3.14
How it works
Round half-up is standard; banker's rounding rounds ties to even.
3.14159 rounded to 2 decimals = 3.14; to 3 sig figs = 3.14.
Frequently asked questions
- What is banker's rounding?
- Rounding 0.5 to the nearest even number — reduces bias in large sums.
- Sig figs vs decimals?
- Sig figs preserve relative precision; decimals fix absolute precision.
- Does it handle negatives?
- Yes — magnitude is rounded and the sign is preserved.
- How many sig figs should I use?
- Match the precision of your least-precise input.
More in Math
- PCPercentage Calculator
Calculate percent of a number, percentage change, and percent difference between two values — with reverse solving for base, part, and percent supported.
- SCScientific Calculator
Free online scientific calculator with trigonometry, logarithms, exponents, square roots, factorials, parentheses, and memory — no download or install needed.
- FCFraction Calculator
Add, subtract, multiply, divide, and simplify proper, improper, and mixed fractions with automatic reduction to lowest terms and decimal equivalents shown.
- RCRatio Calculator
Simplify ratios to lowest terms and solve for a missing term in a proportion (A:B = C:D) from any three known values — perfect for recipes, maps, and scale.
You might also need
Tools from other categories that people commonly pair with the Rounding Calculator.
- GCGPA Calculator
Compute grade point average on the 4.0 scale, weighted by credit hours, from letter or numeric grades across any number of courses in a semester or year.
- GCGrade Calculator
Compute your final class grade from assignment weights and scores, plus the minimum score needed on remaining work to reach a target letter grade or percent.