Round to Any Number

Name: Round to Any Number
Author: Jürgen Kummer

Rounds a value on the base of an arbitrary number. Rounding is usually to a decimal place, rounding to one decimal place in the decimal system corresponds to rounding to 0.1, to three decimal places corresponds to rounding to 0.001. However, you can also enter any values that do not have to be decimal as the basis for the rounding; the value that is closest to an integer multiple of the rounding basis will be shown. The source code for rounding is round(a/b)*b, for rounding down floor(a/b)*b and for rounding up ceil(a/b)*b. Rounding can also be performed on any integer number.

Example: 15 rounded to 0.7 is 14.7, rounded up it is 15.4. 100 rounded with 15 is 105, rounded down 90.

Rounding to flexible intervals can be useful in technical, economic, and scientific fields when you need to adjust values to practical increments that don't correspond to the decimal system.

Here are some applications for such calculations and how to perform them:
Price optimization: Adjusting sales prices to predefined price increments in retail, such as multiples of 25 cents (0.25 euros or dollars).
Material requirements planning: Adjusting dimensions to available standard lengths or sizes, for example, for building materials, cables, or textiles, to minimize waste. For example, wooden slats or sheet metal plates to 25 or 30 centimeters, or 0.25 or 0.3 meters. 0.33333 for one-third is also possible.
Time tracking: Rounding work or project times to quarter-hour, half-hour, or full-hour blocks for billing or planning purposes. Time can be specified in hours with decimal places, such as 1.25 for one and a quarter hours, rounded to the nearest 0.25, or in minutes, rounded to the nearest 15.
Measurement technology: Adjusting sensor or measured values to the accuracy of the device used, for example, with analog-to-digital converters or scales with fixed divisions, such as a voltmeter with 0.5 volts.
Production control: Rounding batch sizes or quantities to machine-specific capacities or packaging units to make processes more efficient, for example, 15 pieces of something per package.
Statistical analysis: Grouping data into freely definable classes, such as income distributions or age groups, to create meaningful categories.
Logistics: Optimizing delivery quantities or pallet sizes to reduce transport and storage costs.
Financial planning: Distributing investments or expenditures into round amounts of 10 or 100 to utilize budget targets or tax allowances.

Last updated on 01/31/2026. Author: Jürgen Kummer

Value to round:
Round to:
Rounded value: