This free online rounding calculator rounds any number to the nearest integer, a set number of decimal places, or the nearest multiple of a number you choose. Pick whether to round to the nearest value, always round up, or always round down for full control.
How to Use the Rounding Calculator
Enter the number you want to round in the "Number" field.
Choose a "Rounding Type": Nearest, Round Up, or Round Down.
Choose what to "Round To": Decimal Places, Nearest Integer, or Nearest Multiple Of.
If applicable, set the "Decimal Places" or "Multiple" value that appears.
Click "Calculate" to see the rounded result.
Frequently Asked Questions
"Nearest" uses standard rounding (Math.round) to the closest value, "Round Up" always rounds toward positive infinity (Math.ceil), and "Round Down" always rounds toward negative infinity (Math.floor), regardless of how close the number is to the next value.
The calculator multiplies the number by 10 raised to the number of decimal places, applies the chosen rounding method, then divides back by the same factor. For example, rounding 3.14159 to 2 decimal places gives 3.14.
It divides your number by the multiple, rounds the result using the selected rounding type, then multiplies back by the multiple. A multiple of zero isn't allowed and shows the error "Multiple cannot be zero".
Yes, this rounding calculator is completely free with no sign-up required.