Final = Original − Discount
Discount = Original × (Percent ÷ 100)
Percent = 100 × (1 − Final ÷ Original)
Original = Final ÷ (1 − Percent ÷ 100)
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Discount Calculator
Price tags and promos can get messy fast. This Discount Calculator gives you clean numbers in seconds—whether you know the percent off, the dollar amount off, or the final price you want to hit. Enter any two values and the tool solves the rest, showing your original price, discount amount, discount percentage, and final price.
How the math works (quick formulas)
- Discount amount = Original × (Percent ÷ 100)
- Final price = Original − Discount
- Discount percent = 100 × (1 − Final ÷ Original)
- Original price = Final ÷ (1 − Percent ÷ 100)
These four relationships cover every case. If you provide any two, the other two fall into place.
Examples
1) Percent off → final price
A jacket is $120 with 25% off.
Discount = 120 × 0.25 = $30
Final = 120 − 30 = $90
2) Dollar off → percent off
A blender is $80 with $12 off.
Percent = 100 × (12 ÷ 80) = 15%
Final = 80 − 12 = $68
Multiple discounts aren’t additive
“20% off + extra 10%” is not 30% off. Apply them in sequence:
Final = Original × (1 − 0.20) × (1 − 0.10) = Original × 0.72
Effective discount = 1 − 0.72 = 28%. Use this to compare stacked deals fairly.
Before or after tax?
Most retailers apply the discount before sales tax. Some regions differ, especially for coupons. If tax matters to your total, calculate discounted price first, then add tax per local rules.
How to use the calculator
- Pick your currency.
- Enter any two of the four fields (Original, Discount %, Discount $, Final).
- Click Calculate.
- Review the Summary (original, discount, percent, final) and copy/share the result.
Tips to compare offers quickly
- Percent vs. amount: For lower-priced items, “$ off” can beat a small percent. For higher-priced items, percent off scales better.
- Watch rounding: If you need exact change or price points, round final price last.
- Check exclusions: Some promos exclude already discounted items or limit the maximum dollar off.
- Set targets: If you know the final price you want, enter Final and Percent (or Amount) to see what the original must be.
Why this calculator helps
It removes guesswork, avoids bad “back-of-the-napkin” math, and standardizes how you compare promotions—especially when multiple discounts stack. Use it for seasonal sales, quote prep, or quick pricing decisions with clients.
Ready to run the numbers? Enter two values, click Calculate, and get a clear, shareable answer.
