Below you'll find a rounding numbers calculator, which will round the number you input to the proper number of digits. Choose from multiple rounding algorithms, including rounding half up, rounding half down, and taking the ceiling or floor of a number to the digits you require.
Rounding Numbers Calculator
Using the Rounding Numbers Calculator
To use the rounding numbers calculator, first, enter the number you'd like to round in the "Number to Round" field.
Next, enter the number of places you'd like to round the number to in the "Number of Places" field.
Finally, choose the rounding algorithm you'd like to use, from "Half Rounds Up", "Half Rounds Down", "Ceiling" or "Floor".
When you're happy with your choices, hit the "Round Number" button, and the tool will give you the rounded number inside the "Rounded Number" field:
Rounding Numbers Rules
The tool includes four methods, or algorithms, for rounding. Here is how they all work:
- Half Rounds Up - if your number has a "5" in the digit after your choice of number of places, round the last digit up.
- Half Rounds Down - if your number has a "5" in the digit after your choice of number of places, round the last digit down.
- Ceiling - if your number has any digits after your choice of the number of places, round the last digit up. It will use the number you input if it doesn't have any digits after.
- Floor - if your number has any digits after your choice of the number of places, it will take the last digit as is. It will use the number you input if it doesn't have any digits after.
