Discount calculator
Find the sale price and how much you save, including stacked discounts and tax.
How it works
Enter the original price and the discount to see what you pay and what you save. Stacked discounts are applied in sequence, which is how shops actually apply them.
Two discounts never simply add up. "50% off, then an extra 20% off" leaves 0.5 × 0.8 = 0.4 of the original price — 60% off, not 70%. The second discount is taken from the already-reduced price, which is why the order the shop applies them in does not change the total but the arithmetic still surprises people.
Tax is applied after the discount in most jurisdictions, so a discount reduces the tax you pay as well as the price.
This tool runs entirely in your browser. Nothing you enter is sent to a server, logged or stored, and the page keeps working with the network disconnected.
Common questions
- How do you calculate a discount?
- Multiply the price by the discount as a decimal to find the saving, then subtract. 30% off $80 is 0.3 × 80 = $24 off, leaving $56. Or go straight there: 80 × 0.7 = $56.
- Does 50% off plus 20% off equal 70% off?
- No — it is 60% off. The 20% comes off the already-halved price, so you pay 0.5 × 0.8 = 0.4 of the original.
Related pages
- Percentage calculator Work out a percentage of a number, what percent one number is of another, and percentage change.
- Loan and EMI calculator Monthly payment, total interest and total repaid for any loan amount, rate and term.
- BMI calculator Body mass index from height and weight, in metric or imperial, with what the number does and does not mean.
- Tip calculator Work out a tip and split the bill, with the per-person figure rounded sensibly.
- Age calculator Exact age in years, months and days from a date of birth, plus total days and the next birthday.
- Paint calculator How much paint a room needs, allowing for doors, windows and the number of coats.
- Compound interest calculator Growth of a lump sum plus regular contributions, with the interest shown separately.
- Calorie and BMR calculator Resting metabolic rate and daily calorie needs by activity level.
- Dog age calculator A dog's age in human years, using the research formula rather than multiplying by seven.
- Days between dates Exact days, weeks, months and working days between two dates.