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How to round a number
Enter the number, precision, and rule that should be applied to the result.
Enter the number
Type any finite number, including a negative or decimal value.
Set decimal places
Choose an integer from −12 to 12; positive values keep digits after the decimal point.
Choose the method
Select nearest, up, down, or truncate and review the resulting value and difference.
Frequently Asked Questions
What does nearest rounding do?
It selects the closest value at the requested precision, with halfway values rounded upward.
What is the difference between up and down?
Up uses the ceiling direction and down uses the floor direction at the selected precision.
What does truncate mean?
Truncation removes digits beyond the selected precision without rounding them.
Can I round negative numbers?
Yes. The directional methods retain their mathematical meaning for negative values.
Can decimal places be negative?
Yes. Negative places round to tens, hundreds, or larger powers of ten.
What is the maximum precision?
This calculator accepts decimal places from −12 through 12.
Why is the displayed result different from the input?
The difference shows how much the selected rounding rule changed the original number.