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Start with a focused tool
Live tools include the formula, a checked example, and documented assumptions.
Tip Calculator
Calculate the tip, total bill, and per-person split in one step.
Discount Calculator
25% off $80 is $60. Sale price = Original × (1 − Discount % ÷ 100). Stacked rates multiply remaining price, not percents.
Unit Price Calculator
Compare two packs by price per unit so the lower unit price is obvious.
Common tasks
What people use this collection for
- Tip and split a bill
Enter the bill, tip rate, and number of people to see tip, total, and the even split.
- Apply a sale price
Discount reduces a listed price by one rate, or by two rates applied in order. 20% then 10% is not 30% off.
- Compare two packs
Unit Price divides each pack price by its quantity. The lower unit price is the better value if the items match.
Suggested path
From a bill to a shelf comparison
These links go only to published calculators or stay on this page as unlabeled steps.
Questions
About this collection
Should I tip before or after tax?
Customs vary. Enter the subtotal to tip before tax, or the final bill to tip on the total.
Is a tip the same as a discount?
No. Tip adds a percent to a bill. Discount subtracts a percent from a listed price.