A sign that says 30% off tells you the discount, not the price. This calculator does the mental maths instantly: enter the original price and the percentage to see the final price and the amount saved. It also handles the tricks of real sales — two discounts stacked on top of each other, and tax added back at the till — so the number you see is the number you actually pay.
Stacked Discounts and Tax, Explained
Two discounts do not add the way most people expect. A 20% discount followed by another 10% is not 30% off: the second discount applies to the already-reduced price, giving 28% off overall. The calculator's stacked mode applies them in sequence and shows the true result. The tax option then adds a tax percentage to the discounted price, which matters where shelf prices exclude tax and the real total only appears at checkout.
How to Calculate a Discount
- Enter the original price.
- Enter the discount percentage.
- Read the final price and the amount you save.
- For a second promotion, switch to stacked mode and enter the extra percentage.
- If prices exclude tax, add the tax percentage to see the checkout total.
Everyday Uses
Shoppers compare competing sale offers honestly instead of being dazzled by the bigger percentage on a higher starting price. Sellers sanity-check the margin left after a promotion. Students practise percentage problems with real answers. Anyone facing a members-only extra discount at the till can verify the register's maths before paying.
Frequently Asked Questions
Why is 20% plus 10% not 30% off?
Percentages apply to different bases. The 10% comes off the reduced price, so the combined saving is 28% of the original.
Can I find the original price from a sale price?
Use the same figures in reverse: divide the sale price by (1 minus the discount rate). For example, at 25% off, divide by 0.75.
Does the tax option cover every tax system?
It applies a single flat percentage to the discounted price, which matches simple sales-tax cases. Tiered or item-specific taxes need your local rules.