Rounding Calculator
Round a number to decimal places, significant figures, or the nearest multiple.
How Rounding Works
Rounding replaces a number with a simpler approximate value. The approach depends on what you are rounding to: a fixed number of decimal places, a count of significant figures, or the nearest multiple of a chosen value.
Rounding Modes
- Decimal places: Keep a set number of digits after the decimal point. For example, 3.14159 to 2 decimals is 3.14.
- Significant figures: Keep a set number of meaningful digits. For example, 12345 to 2 significant figures is 12000.
- Nearest multiple: Round to the closest multiple of a value. For example, 47 to the nearest 10 is 50.
Tip: Significant figures are useful in science and engineering, while nearest-multiple rounding is handy for estimating prices, quantities, or measurements.
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Note: This calculator provides mathematical rounding based on the mode and precision you select. While we strive for accuracy, please verify important calculations independently. This tool is for educational and informational purposes and should not be the sole basis for financial, academic, or professional decisions.