Cost Breakdown Calculator

Enter the amount of each cost or expense item to get its share of the total. If you also enter a base amount such as revenue, you get each item as a percent of revenue.

Items and amounts (2 to 20 rows; the item name is optional; only rows with an amount are counted)

Base amount (optional: revenue, for example; if you enter it, each item is also shown as a percent of it)

How to round the shares

"Make the shares add up to 100.00%" rounds each share down, then gives the leftover 0.01% points out one at a time, starting with the rows with the largest fractions. Rows with equal fractions go in the order you entered them (the upper row first).

Shares of the total

Total of the amounts—

Total of the shares—

The values copied are the shares of the rows as numbers without the % sign (for example, 30.00), one per line. Shares are rounded to 2 decimal places.

How a share is calculated

The share of an item is how many percent of the total it makes up:

Share (%) = amount of the item ÷ total × 100

For example, if outsourcing is 3,000, labor is 5,000 and advertising is 2,000, the total is 10,000 and the shares are 30.00%, 50.00% and 20.00%. The currency does not matter, and none is assumed.

Making the shares add up to 100.00%

If each share is rounded to 2 decimal places, the total can come out a little off 100.00%. For example, three equal amounts each give 33.33%, and the total is 99.99%.

The default here is a method that always makes the total exactly 100.00% (the largest remainder method):

Round each share down to 2 decimal places.
Find the difference from 100.00% (the leftover 0.01% points).
Give the leftover one 0.01% at a time to the rows with the largest fractions (the part that was cut off), largest first.
Rows with equal fractions go in the order you entered them (the upper row first).

Three equal amounts become 33.34%, 33.33% and 33.33%, which add up to 100.00%. If you choose "Only round each row", nothing is adjusted, so the total can be off 100.00%, and the calculator shows by how much.

Percent of a base amount (for example, percent of revenue)

If you enter a base amount such as revenue, each item and the total are also shown as a percent of the base:

Percent of revenue = amount of the item ÷ revenue × 100
A single cost as a percent of revenue can also be found with the Cost Ratio Calculator.

This is a separate calculation from the share of the total. Each item is simply rounded to 2 decimal places, and it is not adjusted to add up to 100%.

Examples

Outsourcing 3,000, labor 5,000, advertising 2,000 → 30.00%, 50.00%, 20.00%
A base amount (revenue) of 15,000 → outsourcing 20.00%, labor 33.33%, advertising 13.33% of revenue (66.67% in total)
1, 1, 1 → 33.34%, 33.33%, 33.33% (total 100.00%)

Notes

Amounts can be 0 or more with up to 2 decimal places (up to 9 digits before the decimal point; the base amount up to 12 digits).
If the amounts add up to 0, the shares cannot be calculated. If the base amount is 0, the percent of base is not shown.
Splitting an amount in proportion to ratios is the reverse calculation; use the Proportional Allocation Calculator.

Frequently asked questions

Why don't my shares add up to 100%?

Rounding to 2 decimal places can leave the total at 99.99% or 100.01%. By default this calculator adjusts the rounding so that the total is exactly 100.00%. If you choose "Only round each row", it does not adjust, and a difference can appear.

What is the difference between a share and a percent of revenue?

A share is the part of the total, so all the shares add up to 100%. A percent of revenue uses revenue as the base. Enter a base amount to see it.

How is an item with an amount of 0 handled?

Its share is 0.00%. A row with no amount entered is not counted.