Budget Overrun Calculator
Use this free Budget Overrun Calculator to determine how much your project is over or under its planned budget. Enter the planned and actual costs to see the percentage instantly.
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How Budget Overrun Is Calculated
Budget variance (%) = ((Actual Cost − Planned Budget) ÷ Planned Budget) × 100
A positive result means the project is over budget. A negative result means the project is under budget. Zero means actual costs match the planned budget.
Example
If your planned budget was $100,000 and actual cost was $110,000: ((110,000 − 100,000) ÷ 100,000) × 100 = 10% over budget.
Budget Overrun Calculator FAQs
How is budget overrun calculated?
Subtract the planned budget from the actual cost, divide by planned budget, and multiply by 100.
What does a negative overrun mean?
A negative overrun means your project is under budget.