Rounding Calculator
Compare six rounding methods side by side — half up, half down, banker's, ceiling, floor, and truncation.
Number to round
Updates as you typeWhere each method lands
Fan-out from your number to each rounded targetHow each method works
Expand for worked examples with your numberRound half up Standard
Round to the nearest — when exactly halfway, round away from zero. This is the rounding most people learned in school.
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Round half down
Round to the nearest — when exactly halfway, round toward zero. Rarely used except in specific accounting contexts.
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Round half even Banker's
Round to the nearest — when exactly halfway, round to the nearest even digit. Eliminates the upward bias of half-up when averaging many rounded values. Default in IEEE 754 and most financial software.
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Ceiling
Always rounds up toward positive infinity. A positive number gets bigger; a negative number gets closer to zero.
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Floor
Always rounds down toward negative infinity. A positive number gets smaller; a negative number moves further from zero.
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Truncate
Drops every digit past the cut-off — always moves toward zero. Identical to Floor for positive numbers, but differs for negatives.
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