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Round to decimals or place values.
A rounding calculator rounds a number to a chosen precision — a set number of decimal places or the nearest 10, 100 or 1000 — and also shows the floor (rounded down) and ceiling (rounded up) values.
Rounding keeps numbers readable and appropriate for their context, whether that is money to two decimals or a population figure to the nearest thousand.
Round-half-up: a value exactly halfway is rounded to the larger neighbour. Floor always rounds toward −∞ and ceiling always rounds toward +∞.
Rounding goes to the nearest value at the chosen precision. Floor always goes down to the lower step, and ceiling always goes up to the higher step, regardless of how close the number is.
This tool uses round-half-up, so exactly 2.5 becomes 3 and 2.45 rounded to one decimal becomes 2.5. Some fields prefer round-half-to-even (banker's rounding) for large data sets.
The presets cover decimals and powers of ten. For other steps, divide by the step, round, then multiply back — which is exactly the formula used here.