ESTIMATED ORIGINAL AMOUNT
£0.00
Enter an amount and percentage to calculate the original value.
This calculator estimates the original amount before a percentage was added or removed.
How to calculate reverse percentage
A reverse percentage calculation works backwards from a final amount to estimate the original value before a percentage increase or decrease was applied.
Example: reversing a 20% discount
If a product costs £80 after a 20% discount, the original price before the discount was £100.
This is because £80 represents 80% of the original amount.
What this calculator is for
This reverse percentage calculator helps estimate original prices, values, salaries, VAT-exclusive amounts, discounts and other percentage-based calculations.
It may be useful for shopping discounts, VAT calculations, invoices, accounting, pricing, budgeting, payroll estimates and general financial calculations.
Reverse percentage formula
A simple reverse percentage formula is:
Original value = final value ÷ percentage remaining
For example, if a value after a 20% reduction is £80, divide £80 by 0.8 to estimate the original amount.
Important note
This calculator is for general informational purposes only. Actual tax, VAT or pricing calculations may vary depending on rounding methods and business rules.
Frequently Asked Questions
What is reverse percentage?
Reverse percentage means working backwards from a final value to estimate the original amount before a percentage increase or decrease.
Can this reverse discounts?
Yes. You can estimate the original price before a discount was applied.
Can this reverse VAT?
Yes. You can estimate the original amount before VAT was added.
Can this calculate salary increases?
Yes. It can estimate an original salary before a percentage increase.
What happens if the percentage is 100%?
A reverse percentage calculation cannot divide by zero remaining percentage, so 100% removal is not possible.