Round to the Nearest Whole Number – Online Calculator and Rules

Enter a number:

Result of rounding the number to the nearest whole number:

≈0.00

What Does It Mean to Round to the Nearest Whole Number?

Rounding a number to the nearest whole number means simplifying the number by writing it with fewer significant digits while keeping its value close to what it originally was.

The rounded number is less precise (introducing some error), but easier to use in practice.

Most often, rounding a number to the nearest whole number refers to mathematical rounding to the nearest whole number.

Mathematical rounding to the nearest whole number means rounding the number to the nearest integer, where the difference between the original number and the rounded number is minimized.

Rounding Rules to the Nearest Whole Number:

  • The last digit of the whole number remains unchanged if the first digit after the decimal point is less than 5. (0; 1; 2; 3; 4)
  • The last digit of the whole number increases by 1 if the first digit after the decimal point is 5 or greater. (5; 6; 7; 8; 9)

Examples:

  • 1.1 rounds to 1 because the first digit after the decimal point (1) is less than 5
  • 1.2 rounds to 1 because the first digit after the decimal point (2) is less than 5
  • 1.3 rounds to 1 because the first digit after the decimal point (3) is less than 5
  • 1.4 rounds to 1 because the first digit after the decimal point (4) is less than 5
  • 1.5 rounds to 2 because the first digit after the decimal point (5) is equal to 5
  • 1.6 rounds to 2 because the first digit after the decimal point (6) is greater than 5
  • 1.7 rounds to 2 because the first digit after the decimal point (7) is greater than 5
  • 1.8 rounds to 2 because the first digit after the decimal point (8) is greater than 5
  • 1.9 rounds to 2 because the first digit after the decimal point (9) is greater than 5
  • 1.45 rounds to 1 because the first digit after the decimal point (4) is less than 5
  • 1.49 rounds to 1 because the first digit after the decimal point (4) is less than 5
  • 1.5001 rounds to 2 because the first digit after the decimal point (5) is equal to 5