Discount Calculator | Free Percent Off & Savings Tool
Quickly calculate sale prices, savings, and discount percentages. Supports stacked discounts, sales tax, quantity pricing, and side-by-side comparison. Free and easy to use.
📖 Want to understand your results?
Read our complete guide to the Discount Calculator — with real-world examples, expert insights, and pro tips.
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How the Discount Calculator Works
Our discount calculator offers four powerful modes to handle any discount scenario:
Percent Off
Enter the original price and discount percentage to instantly see your savings, final price, and per-item cost. Includes sales tax and quantity options for bulk purchases.
Original Price
Know the sale price but not the original? Enter the sale price and the discount % to reverse-engineer the original price and see your total savings.
Discount Percentage
See a great deal but not sure what % you're saving? Enter the original and sale price to calculate the exact discount rate and your total savings.
Stacked Discounts
Chain up to 3 discounts sequentially (e.g., 20% off + extra 10% off). See the exact step-by-step math and compare the effective rate against a single discount.
Discount Formulas Explained
Percent Off Formula
Discount Amount = Original Price × (Discount % ÷ 100)
Sale Price = Original Price − Discount Amount
Example: $100 at 20% off = $100 × 0.20 = $20 discount. Sale price = $80.
Stacked Discount Formula
Stacked discounts are applied sequentially, not added together.
Final Price = Original × (1 − D1%) × (1 − D2%) × (1 − D3%)
Example: $100 with 20% + 10% off = $100 × 0.80 × 0.90 = $72 (28% effective, not 30%).
Find Original Price
Original Price = Sale Price ÷ (1 − Discount % ÷ 100)
Example: You paid $80 after a 20% discount → $80 ÷ 0.80 = $100 original price.
Find Discount Percentage
Discount % = ((Original − Sale) ÷ Original) × 100
Example: $100 original, $80 sale → ($20 ÷ $100) × 100 = 20% discount.
Smart Shopping Tips
Check the Effective Rate
50% off + 20% off is not 70% off — it's 60% off! Use our Stacked Discounts mode to see the real effective discount rate.
Compare Before You Buy
Use our side-by-side comparison to see what 15%, 20%, 25%, and higher discounts mean for your wallet — sometimes an extra 5% off makes a big difference.
Include Tax for True Cost
Sales tax can add 5-10% to your final cost. Toggle on the tax option to see what you'll actually pay at checkout — no surprises.
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Common Discount Quick Reference
How much you save and pay at common discount rates on a $100 item:
| Discount | You Save | You Pay | Per $100 |
|---|---|---|---|
| 5% off | $5.00 | $95.00 | Save $5 |
| 10% off | $10.00 | $90.00 | Save $10 |
| 15% off | $15.00 | $85.00 | Save $15 |
| 20% off | $20.00 | $80.00 | Save $20 |
| 25% off | $25.00 | $75.00 | Save $25 |
| 33% off | $33.00 | $67.00 | Save $33 |
| 40% off | $40.00 | $60.00 | Save $40 |
| 50% off | $50.00 | $50.00 | Save $50 |
| 60% off | $60.00 | $40.00 | Save $60 |
| 75% off | $75.00 | $25.00 | Save $75 |
Reviewed by Emily Watson, M.Ed.
Mathematics EducatorMathematics teacher and curriculum designer with 15+ years of experience.
Discount Calculator Pros & Cons
Pros
- ✅ Instant savings & final price calculation
- ✅ Supports any discount percentage
- ✅ Stacked discount comparison mode
- ✅ Free forever — no subscriptions
- ✅ Works offline after page load
Cons
- ✗ No bulk/batch discount calculation
- ✗ No currency conversion support
Frequently Asked Questions
How do I calculate a discount percentage?
Subtract the sale price from the original price, divide by the original price, and multiply by 100. Example: ($100 − $80) ÷ $100 × 100 = 20% discount. Use our Discount % mode for instant results.
What is the formula for percent off?
Discount Amount = Original Price × (Discount % ÷ 100). Sale Price = Original Price − Discount Amount. For example, $200 at 25% off = $200 × 0.25 = $50 discount, sale price is $150.
How do I find the original price before a discount?
Divide the sale price by (1 − discount %). Example: If you paid $68 after a 15% discount, the original price was $68 ÷ 0.85 = $80.
Does a 50% + 20% discount equal 70% off?
No! Stacked discounts apply sequentially. 50% off takes $100 to $50, then 20% off the $50 takes it to $40 — only 60% off total, not 70%.
Should I include tax in the discount calculation?
Discounts typically apply to the pre-tax price. However, some stores apply coupons after tax. Our calculator lets you toggle tax on or off so you can see both scenarios.
What does 'stacked discount' mean?
A stacked discount is when multiple discounts are applied one after another to the same item. Each discount is applied to the reduced price, not the original.
Want to Learn More?
Check out our comprehensive guide for in-depth explanations, real-world examples, and expert tips.
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