How the discount and tip calculator works
The page has two independent calculators that share one currency setting. The first answers the shopping question: what will I actually pay? Enter the original price and the percentage off. If a store offers a second reduction, such as a loyalty coupon on top of a sale, type it into the extra discount box and the calculator applies it to the already reduced price.
The second answers the dining question: how much is the tip, and what does each person owe? Enter the bill, the tip percentage, and how many people are sharing. You get the tip, the total including tip, and each person’s share of both.
Everything here is tax-free by design. Sales tax rules differ by place, and whether to tip on the pre-tax or post-tax amount is a matter of custom. If you tip on the pre-tax subtotal, enter that subtotal as the bill and add tax separately. If you prefer to tip on the full amount, enter the final total.
The formulas
Sale price = Price × (1 − Discount%)
Two discounts = Price × (1 − D1) × (1 − D2)
Tip = Bill × Tip%
Per person = (Bill + Tip) / People
Notice that stacked discounts multiply rather than add. A 25% discount followed by a 10% discount is not a 35% discount. The second percentage applies to a smaller number, so the effective discount is a little lower than the sum.
Worked examples
Discount. A jacket costs $80. It is marked 25% off, and you have a 10% coupon. After the first discount the price is $60. The coupon takes 10% of that, leaving $54. You save $26, which is an effective discount of 32.5%, not 35%.
Tip. Four friends share a $120 dinner and agree on an 18% tip. The tip is $21.60, the total is $141.60, and each person pays $35.40.
Tips
- Compare unit prices after discounts; the biggest percentage off is not always the cheapest item.
- Check which price the coupon applies to. Some coupons apply to the original price, not the sale price.
- Tipping customs vary. In some countries service is included and a tip is optional, while in others 15% to 20% is common. Check local norms.
- Check the receipt for an automatic service charge before adding a tip, especially for large groups.
- Round the per-person amount up if you want an easy payment split that covers any shortfall.
Frequently asked questions
Why is 25% off plus 10% off not 35% off?
Because the second discount is calculated on the already discounted price. Taking 10% off $60 saves $6, not $8. The effective total is 32.5%, which is Price × 0.75 × 0.90.
Does this calculator add sales tax or VAT?
No. It is intentionally tax-free. Add tax separately using the rate that applies where you shop, remembering that tax is normally calculated on the discounted price.
Should I tip on the amount before or after tax?
Both are common. Many people tip on the pre-tax subtotal because it reflects the service and food cost. Others simply tip on the total for convenience. The difference is small, and either is acceptable.
How do I split a bill unevenly?
Use the tool for the shared items by entering that portion of the bill, then add individual items separately. Alternatively, calculate the tip on the full bill and divide the rest manually.
Can I calculate a markup with this?
The percentage calculator on this site handles increases as well as decreases, so it is the better choice if you need to raise a price by a percentage.