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Math Calculators

Rounding Calculator

Round a number exactly the way you need: to decimal places, to significant figures, or to the nearest multiple such as 10, 100 or 0.05. Choose the rounding rule too.

Rounded value1,234.57
Rounding unit
0.01
Difference
0.0022
Step-by-step working
  1. Rounding unit = 0.01
  2. Number ÷ unit = 123,456.78
  3. Apply the “half up” rule → 123457
  4. Multiply back: 123457 × 0.01 = 1234.57

How to use the Rounding Calculator

  1. Enter the number.
  2. Choose decimal places, significant figures or a multiple.
  3. Pick a rounding rule (half up is what most schools teach) and press Calculate.

Formula

Divide by the rounding unit, round to a whole number using the chosen rule, then multiply back. Half to even (banker’s rounding) sends exact halves to the nearest even digit, so 2.5 → 2 and 3.5 → 4, which avoids an upward bias over many values.

Examples

  • 1,234.5678 to 2 dp = 1,234.57.
  • 0.004567 to 2 sf = 0.0046.
  • ₹47.38 to the nearest 0.05 = 47.40.

Frequently asked questions

Why does 2.675 round to 2.67 in some software?

Because 2.675 cannot be stored exactly in binary and is really 2.67499999… This calculator corrects for that tiny error before rounding.

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