🔙 Reverse Percentage & Pre-Discount Solver
Reverse Percentage Calculator
Find the original base price before a discount, sales tax, or VAT percentage was applied.
$
%
Sample Presets:
UK 20% VAT ($120 final)
US 8.25% Sales Tax ($108.25 final)
25% Off Sale ($75 paid)
50% Clearance ($40 paid)
Original Pre-Adjustment Amount
$100.00
Multi-Tier Sensitivity Matrix (for $120.00 final price):
| Percentage Rate | Original Price | Adjustment Difference | Verification Check |
|---|
The Common Reverse Percentage Mistake
A frequent algebraic error is subtracting $20\%$ directly from a $\$120$ total ($\$120 - 20\% = \$96$), which gives the wrong base!
Before Tax (Increase): Original Price = Final Amount / (1 + Rate)
Before Discount (Decrease): Original Price = Final Amount / (1 − Rate)
Before Discount (Decrease): Original Price = Final Amount / (1 − Rate)