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Rounding Numbers Calculator

Written by:
PK

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 calculator screenshot rounding half down
Running the rounding numbers calculator with "Half Rounds Down"

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.
      

PK

PK started DQYDJ in 2009 to research and discuss finance and investing and help answer financial questions. He's expanded DQYDJ to build visualizations, calculators, and interactive tools.

PK is in his mid-30s and works and lives in the Bay Area with his wife, two kids, and dog.

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