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Number Rounding Calculator

Round a decimal exactly to decimal places or significant figures with an explicit tie rule.

Browser processingEditable exampleCopy · download · print

1. Set up your calculation

Input supports 200 digits and exponents ±300. Decimal strings and integer arithmetic prevent binary floating-point tie surprises. Trailing zeros show the requested precision.

2. Review & use your result

Review the example inputs, then use round number.

Report / export preview

Generated file contents

Using Number Rounding Calculator

Round a decimal exactly to decimal places or significant figures with an explicit tie rule.

Enter number (decimal or e notation) and precision mode. Try the example to see the format.
Round number and review the result, including the assumptions shown below the inputs.
Copy, download or print your result. Editing an input clears the previous result.

Example

The included example: Rounded number — 1234.57; Precision — 2 decimal places.
Change the inputs and generate a new result to compare it.

Questions & answers

How do I use this tool?

Round a decimal exactly to decimal places or significant figures with an explicit tie rule. Load the editable example, replace its values and use the main action button.

What should I check before using the result?

Input supports 200 digits and exponents ±300. Decimal strings and integer arithmetic prevent binary floating-point tie surprises. Trailing zeros show the requested precision.

Are my entries saved?

Processing runs in your browser without a tool account or saved history. Download your result to keep a copy. Website advertising follows our privacy information.

Can I export or print it?

Copy and file download are available after generating a result. Print produces a clean copy of the visible result; use your browser’s Save as PDF option if needed.

How are values ending in exactly five handled?

Nearest with ties away from zero increases the magnitude at a tie. Ties to even selects the result whose last retained digit is even. The other modes round in the named direction rather than to the nearest value.