How to Calculate Percentage Decrease
Learn how to calculate percentage decrease between two values.
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Quick answer
Percentage decrease is calculated by subtracting the new value from the old value, dividing by the old value, and multiplying by 100.
Step-by-step
- Write down the values you already know.
- Use the correct formula and keep the units consistent.
- Calculate the result and check whether it makes practical sense.
Use the calculator
The easiest way to avoid mistakes is to use the related calculator and then review the formula shown on the page.
Open Percent Change Calculator →
Common mistakes
- Using the wrong unit or percentage format.
- Rounding too early.
- Forgetting extra costs, waste, taxes, or allowances where they apply.
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