Cost allocation is the process of assigning shared or indirect costs, such as rent, utilities, or central services, to the departments, products, or entities that benefit from them. This calculator handles the arithmetic step: you choose the percentages, and it splits the pool into an amount for each line.

Pick a basis that reflects how the cost is consumed: headcount for HR costs, floor space for rent, usage for IT, or revenue when nothing better exists. Convert each line's share of that basis into a percent and enter it here. The tool checks that the percents total 100.

The calculator stops and tells you the current total, for example 95 or 102, instead of allocating the pool. It does not scale the percentages automatically, because that would hide a mistake in the basis. Adjust the lines until they total 100, and the amounts appear.

Just in your browser. The pool and lines are saved to local storage on your device, which lets you return to the same split later, and you can use the tool without any sign-up. Nothing is sent to a server.