Rounding Calculator
Type any number to see it rounded instantly. You can round to place values, significant figures, or decimal places.
Place Value Rounding
Significant Figures
FAQ: Rounding Calculation
1. What does it mean to round a number?
Rounding in maths means making a number simpler while keeping it close to its original value.
It’s useful when exact precision isn’t needed.
2. What is the rule for rounding numbers?
If the next digit is 5 or more, round up.
If the next digit is 4 or less, round down.
Example: 8.46 → 8.5 (rounded to 1 decimal place)
3. How do I round to decimal places?
Decide how many digits you want after the decimal point.
Then use the rounding rule on the next digit to decide whether to round up or down.
Example: 12.4567 → 12.46 (rounded to 2 decimal places)
4. What are significant figures (sig figs)?
Significant figures show how precise a number is.
Start counting from the first non-zero digit, all digits after that count.
Examples: 0.00452 → 3 sig figs (4, 5, 2)
5. How do I round to significant figures?
Keep only the chosen number of significant digits, round the next one, and replace the rest with zeros if necessary.
Example: 6789 → round to 2 significant figures = 6800
6. What’s the difference between decimal places and significant figures?
Decimal places count digits after the decimal point.
Significant figures count digits from the first non-zero number.
Example: 12.345 → rounded to 2 decimal places = 12.35, rounded to 3 significant figures = 12.3
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