Discount Calculator
Calculate sale price, discount amount, or original price — three modes in one tool.
Enter values above to calculate
Three Discount Formulas
Sale price:
Price = Original × (1 − Discount/100)
Discount %:
% = ((Original − Sale) ÷ Original) × 100
Original price:
Original = Sale ÷ (1 − Discount/100)
💡 Mental math: find 10% (move decimal left), then multiply. 25% off $80 = 10% ($8) × 2.5 = $20 off.
Step-by-Step: 25% off $80
1 Convert: 25 ÷ 100 = 0.25
2 Subtract from 1: 1 − 0.25 = 0.75
3 Multiply: $80 × 0.75 = $60
4 Saving: $80 − $60 = $20
Quick Reference — Common Discounts
| Original | 10% off | 15% off | 20% off | 25% off | 50% off |
|---|---|---|---|---|---|
| $20 | $18.00 | $17.00 | $16.00 | $15.00 | $10.00 |
| $50 | $45.00 | $42.50 | $40.00 | $37.50 | $25.00 |
| $100 | $90.00 | $85.00 | $80.00 | $75.00 | $50.00 |
| $200 | $180.00 | $170.00 | $160.00 | $150.00 | $100.00 |
| $500 | $450.00 | $425.00 | $400.00 | $375.00 | $250.00 |
| $1000 | $900.00 | $850.00 | $800.00 | $750.00 | $500.00 |
Frequently Asked Questions
How do I calculate 20% off a price?
Multiply the price by 0.80 (which is 1 − 0.20). For example, 20% off $50 = $50 × 0.80 = $40.
What is the difference between discount and markdown?
A discount is a reduction given to the buyer. A markdown is a permanent price reduction by the retailer.
How do I find the original price if I only know the sale price?
Divide the sale price by (1 − discount/100). If you paid $68 after 15% off: $68 ÷ 0.85 = $80.
Can you apply two discounts together?
Yes, but they compound — they do not add. 20% then 10% off is not 30% off. On $100: after 20% = $80, then 10% = $72. Combined saving is 28%, not 30%.