Round any number to decimal places, significant figures, the nearest integer, ten, hundred, or any custom multiple — using all standard rounding methods including half-up, half-even (banker's), and truncation.
Round a Number
Rounded Result
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Original
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Rounded
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Rounding Error
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% Error
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Enter a number and choose rounding type
Supports 6 rounding methods including banker's rounding.
Frequently Asked Questions
What is half-even (banker's) rounding?
Banker's rounding rounds 0.5 to the nearest even number: 2.5 → 2, 3.5 → 4. This reduces cumulative rounding bias across large datasets and is the default in Python, IEEE 754, and many financial systems.
What are significant figures?
Significant figures are the meaningful digits in a number. 3.1400 has 5 sig figs; 0.0042 has 2 sig figs (leading zeros don't count). Scientific measurements are typically rounded to a specific number of sig figs.