Enter a number and choose how many decimal places to round to, and whether to round to the nearest value, up, or down.
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Round to Nearest rounds to the closest value at your chosen decimal place, the standard rounding method (0.5 rounds up). Round Up always rounds toward positive infinity, and Round Down always rounds toward negative infinity, regardless of how close the number is to either boundary.
Rounding 3.14159 to 2 decimal places using Round to Nearest looks at the third decimal digit (1), which is less than 5, so it rounds down to 3.14. Rounding 3.011 to 0 decimal places using Round Up moves to the next whole number toward positive infinity regardless of closeness, giving 4, not 3, even though 3.011 is much closer to 3.
Assuming 'Round Up' always means 'round away from zero', for negative numbers, rounding up means moving toward positive infinity, so −3.5 rounded up becomes −3, not −4, which can feel counterintuitive.
Using 'Round to Nearest' when the goal is actually always rounding in one direction, like always rounding a price up to avoid undercharging, Round to Nearest can round down depending on the digits, use Round Up specifically for that case.
Forgetting that decimal places must be a whole number of 0 or more, this calculator doesn't support rounding to negative decimal places (like rounding to the nearest 10 or 100) directly.
Enter 0 decimal places to round to the nearest whole number. You can also round to negative territory conceptually by scaling your input, though this calculator supports 0 or more decimal places directly.
Round to Nearest picks whichever boundary is closer. Round Up always moves toward positive infinity even if the number is very close to the lower boundary, for example, 3.01 rounded up to 0 decimal places becomes 4, not 3.
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