When to use this calculator
Recover the original value before a percentage increase. For a decrease, use the reverse discount calculator instead.
Explore the percentage & ratio calculators for other questions in this topic. For a related calculation, use the Successive Discounts Calculator: Calculate the final price after two discounts applied one after the other.
PUTTING IT INTO PRACTICE
Reverse Percentage: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Value after increase | 120 |
| Increase (%) | 20 |
| Result | 100 |
- Check the input labels and enter the example values above.
- Apply the relationship: Original = final ÷ (1 + increase ÷ 100).
- The result is 100 , rounded for display.
How to interpret your result
For a decrease, use the reverse discount calculator instead.
Choose the base before calculating. Percentage points compare two rates by subtraction, while percentage change divides a difference by an original value. Successive discounts apply one after another rather than adding together.
Frequently asked questions
Should I use percentage change or percentage points?
Use percentage change for relative movement from a baseline. Use percentage points for the direct difference between two percentage rates.
How do I use the reverse percentage calculator?
Enter value after increase, increase (%). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Original = final ÷ (1 + increase ÷ 100).
What should I check before using the result?
For a decrease, use the reverse discount calculator instead.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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