Discount Calculator
Convert between original price, discount rate and final price; add quantity and a spend-save coupon.
Fill the discount rate or the discounted price, not both: the empty one is derived. When both are filled, the rate wins.
Unit price after discount —
Effective discount rate —
Subtotal after discount —
Spend-and-save applied —
Final total —
Total saved —
All amounts are handled in cents, so a 30% rate on 129.00 becomes 90.30 per unit and totals never drift by a stray cent.
How to use it
- Enter the original unit price.
- Fill in either the discount rate or the discounted unit price; the other one is derived. When both are filled, the rate wins.
- Enter the quantity for multi-item orders.
- Optionally add a spend-and-save deal: a threshold and the amount taken off once the subtotal reaches it. An empty threshold applies it unconditionally.
- Read the unit price after discount, the effective rate, the subtotal, the spend-and-save applied, the final total and the total saved.
Common use cases
- Sale math - check what a 30%-off tag really costs for four items.
- Reverse checks - verify a claimed discount from the sticker prices.
- Coupon stacking - see whether a spend-and-save coupon still applies after the percentage discount.
- Margin reviews - compare effective rates across bundles and quantities.
Why it stays private
Every calculation is cent-level integer arithmetic in this tab. Prices and coupons are never sent anywhere.
FAQ
Q: Which field wins when both the rate and the discounted price are filled? A: The discount rate. Clear it to switch to reverse mode, where the rate is derived from the price you actually paid.
Q: When does the spend-and-save discount apply? A: Only when the subtotal after the percentage discount reaches the threshold. Leave the threshold empty to apply it unconditionally, and the discount is capped at the subtotal.
Q: How are amounts rounded? A: Prices are converted to cents first, so a 30% rate on 129.00 becomes 90.30 per unit and the totals never drift by a stray cent.
Q: Does the total saved include the spend-and-save? A: Yes. It compares the full original quantity price with the final total, so any spend-and-save amount that applied is included.
Your data stays on this device
Discount Calculator runs 100% locally. Everything you paste or drop is processed by your own browser and never transmitted. Nothing is stored on our servers — close the tab and it is gone.
Nothing you type is sent to a server, logged, or used for analytics. The page works even with your network disconnected after first load.