Rounding calculator

Round a decimal exactly to the chosen decimal place, with halfway values rounded away from zero.

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Number

Decimal places (negative for tens, hundreds)

Answer

…

Round a decimal exactly to the chosen decimal place, with halfway values rounded away from zero.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Supports −12 through 20 decimal places. Negative places round to tens, hundreds and larger powers of ten. Trailing zeros preserve the requested decimal places; this is not banker’s rounding.

Whole-number and finite-decimal arithmetic is exact within the stated input limits. Any requested rounding uses the selected setting. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

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Updated 2026-09-20

Using Rounding calculator

Round a decimal exactly to the chosen decimal place, with halfway values rounded away from zero.

Supports −12 through 20 decimal places. Negative places round to tens, hundreds and larger powers of ten. Trailing zeros preserve the requested decimal places; this is not banker’s rounding.

Next: Significant figures calculator

Next: Big number calculator

A worked example

Example inputs: number = 1.005, decimal places (negative for tens, hundreds) = 2. Rounded decimal = 1.01.

Before you use the result

Supports −12 through 20 decimal places. Negative places round to tens, hundreds and larger powers of ten. Trailing zeros preserve the requested decimal places; this is not banker’s rounding. Whole-number and finite-decimal arithmetic is exact within the stated input limits. Any requested rounding uses the selected setting.

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ToolOctopus. “Rounding calculator.” Updated 2026-09-20. https://tooloctopus.com/rounding-calculator.

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