Write the offer order
A second coupon normally uses the price left by the first. Keep that base explicit before multiplying or subtracting.
Six exact retail questions
See what you pay, what you save, and which offer applies first.
DiscountCalc separates price questions that are often compressed into one mental shortcut: percentage off, fixed coupon, two ordered discounts, reverse original price, effective rate, and tax after discount. Exact rational arithmetic keeps every stage auditable while all entered values remain on the page.
No account, upload, purchase history, price feed, or generated result URL.
Three visible checks
Order, calculate, verify
Keep exact decimal arithmetic
DiscountCalc reduces rational values and rounds money only when presenting the final two-decimal display.
Check the actual offer terms
Eligibility, item allocation, tax law, fees, and merchant rounding remain outside the mathematical result.
Six focused modes
Use the price relationship you actually know
- Find a price after a percentage discount.
- Subtract a fixed coupon and reveal its effective rate.
- Apply two discounts in the printed order.
- Recover the original price from sale price and rate.
- Verify the effective percentage between two prices.
- Add your own generic tax rate after the discount.
Check your price
Use the exact discount sequence
Enter the values printed on the offer, keep each stage visible, and compare the mathematical result with the actual checkout terms.