Reverse Percentage Calculator
Find the original value before a percentage was added. Calculate pre-tax or pre-markup prices.
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Original Value
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When to Use This Calculator
- Find the pre-tax price from a total that includes tax
- Calculate the original price before a markup was added
- Determine the base salary before a raise was applied
- Find the original value before any percentage increase
How to Reverse a Percentage
To find the original value before a percentage was added, divide the final value by (1 + percentage/100).
Formula: Original = Final ÷ (1 + Percentage ÷ 100)
Common Uses
- Finding pre-tax prices from totals
- Calculating original prices before markup
- Finding base salaries before raises
- Reversing any percentage increase
Example
A shirt costs $54 after 8% tax. Original price: $54 ÷ 1.08 = $50.
Frequently Asked Questions
Divide the final value by (1 + percentage/100). If $120 includes 20% markup: $120 ÷ 1.20 = $100 original.