Round decimals, sig figs, or nearest.. Rounding Calculator is a free online tool from the ToolsRift Math Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter a number, choose a rounding mode and precision, and the rounded result appears instantly.
Round to a set number of decimal places, to significant figures, or to the nearest 10, 100, 1000 and so on.
The number is snapped to the closest multiple of 100, so 1,234 becomes 1,200.
Digits 5 and above round up, digits below 5 round down (round-half-up), which this calculator uses.