Free Rounding Calculator
Rounded to 2 decimal places
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Browse allWhat Is a Rounding Calculator?
Round any number to decimal places, significant figures, or the nearest step — for money, measurements, and lab results.
How to Use This Calculator
- Enter the number you want to round.
- Choose a mode: Decimals, Sig Figs, or Nearest.
- Set precision: Number of decimal places, significant figures, or nearest step.
- Read the rounded result, original value, and difference.
Rounding Formulas
Nearest step: round(n ÷ step) × step
Decimal places: half-up (digit ≥ 5 rounds up)
Sig figs: keep N meaningful digits from the first non-zero
Worked Example
3.1415926535 → 2 decimal places = 3.14
12345 → 3 significant figures = 12300
847 → nearest 100 = 800
Common Use Cases
- Rounding currency amounts to two decimal places
- Reporting lab measurements to the correct significant figures
- Snapping prices to the nearest $0.50 or $0.25
Frequently Asked Questions
How do you round to a certain number of decimal places?
Look at the digit after the last place you want to keep. If it is 5 or greater, round up. Example: 3.14159 to 2 decimal places is 3.14.
What are significant figures?
Meaningful digits starting from the first non-zero digit. Rounding 12345 to 3 significant figures gives 12300.
How do you round to the nearest 10 or 100?
Divide by the step, round to the nearest whole number, then multiply back. Example: 847 to the nearest 100 is 800.
What rounding method does this calculator use?
Half-up rounding — if the next digit is 5 or above, the last kept digit increases by one.
When should I use significant figures instead of decimal places?
Use sig figs in science and engineering when measurement precision matters. Use decimal places for money and everyday numbers.
Can I round to the nearest 0.5 or 0.25?
Yes. Switch to Nearest mode and choose 0.5, 0.25, 0.1, or 0.01 from the dropdown.
Does rounding work with negative numbers?
Yes. The calculator preserves the sign and applies the same half-up rules to negative values.
Is my data stored when I use this tool?
No. All rounding happens in your browser. Numbers you enter are never uploaded or saved.