Round a number
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Round numbers your way with the Rounding Calculator: decimal places or significant figures, with half-up, banker's, floor and ceiling modes.
Enter a number. Results update live.
Half up is the schoolbook rule (2.5 becomes 3). Half even (banker's rounding) sends exact halves to the nearest even digit, removing bias in large datasets. Floor and ceiling always go down or up; truncate simply cuts digits toward zero.
Decimal places fix digits after the point (money, measurements). Significant figures fix total meaningful digits regardless of magnitude, which is what science and engineering usually need: 0.00314159 to 3 figures is 0.00314.