Budget Variance Calculator
Budget variance shows how actual spending differs from an approved budget in amount and as a percentage of the budget.
How to use this calculator
- Enter a positive budget and actual spend from the same scope and accounting period.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by budget variance percent calculator
Variance = actual spend − budget; variance % = variance ÷ budget × 100%.
- Variance = actual spend − budget; variance % = variance ÷ budget × 100%.
- Budget scope, accrual timing, currency and treatment of commitments influence whether comparisons are valid.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
Actual spend is 54,750 against a budget of 50,000.
54,750 − 50,000 = 4,750; 4,750 ÷ 50,000 = 9.5%.
Actual spending is 4,750, or 9.5%, over budget.
Understanding the result
Budget variance shows how actual spending differs from an approved budget in amount and as a percentage of the budget.
Budget scope, accrual timing, currency and treatment of commitments influence whether comparisons are valid.
Important notes
Budget scope, accrual timing, currency and treatment of commitments influence whether comparisons are valid.
Treat the result as an estimate from the entered assumptions. For safety, legal, engineering, health or commercial decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Is a negative variance good?
It means actual spend is below budget, but whether that is good depends on output, timing and the original assumptions.
Can the budget be zero?
A percentage variance cannot be calculated against a zero budget; use the variance amount instead.
How should I interpret this result?
Budget scope, accrual timing, currency and treatment of commitments influence whether comparisons are valid.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Percentage Change — Learn the percentage change formula, how to calculate increases and decreases, and why the original value matters.
- Percentage Change vs Percentage Difference — Understand the difference between percentage change and percentage difference, including when each formula is appropriate.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.