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Significant Figures Calculator

Round a number to a chosen number of significant digits.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Significant-digit rounding preserves scale through decimal or exponential notation. Binary floating-point can affect halfway cases; this does not infer measurement uncertainty.

How to use it (step by step)

  1. 1Fill in the boxes: “Number”, “Significant digits”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Hex / binary
Other ways of writing numbers. Binary uses only 0 and 1; hex uses 0–9 and A–F.
Rounding / modulo
Rounding makes a number simpler (4.67 → 4.7). Modulo is the remainder after dividing (10 mod 3 = 1).

More in Math

Fraction CalculatorAdd, subtract, multiply and divide fractions, simplified.Ratio CalculatorSolve A : B = C : ? and simplify ratios.GCF & LCM CalculatorGreatest common factor and least common multiple of a list.Prime Number CheckerIs it prime? Plus prime factorization and the next prime.Quadratic Equation SolverSolve ax² + bx + c = 0, including complex roots.Random Number GeneratorRandom numbers in any range, with or without repeats.