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Overhead Allocation Calculator

Apply a shared-cost pool to a selected allocation base.

How to use this calculator

The arithmetic is straightforward; choosing a fair and maintainable allocation base is the harder management decision. Document the pool, eligible population and reason for the driver.

Enter assumptions and calculate.

For a portfolio allocation, the pool rate normally uses the total base across all eligible projects; apply that rate to each project’s base. This simplified tool demonstrates the arithmetic for one project.

Interpret the result

Review the result as a scenario, not a verified estimate. Test the assumptions that matter most, record the date and currency basis, and reconcile the calculator with the project’s formal estimate and approval process.