Everyday Math calculators, in short
These are the calculations people do wrong in their heads most often, usually because percentages get added instead of applied one after another. Each tool shows the arithmetic so you can check it.
Popular tools in this category
- Percentage Calculator — What is X% of Y, X is what percent of Y, and percentage increase or decrease between two numbers.
- Discount Calculator — Sale price and savings from one or two discounts, with optional sales tax on the discounted price.
- Sales Tax Calculator — Add sales tax to a subtotal, or reverse it out of a total that already includes tax.
What can you calculate here?
- What is X% of Y, X as a percent of Y, and percentage change between two numbers
- A sale price from one or two stacked discounts, plus the effective discount
- Sales tax added to a price, or backed out of a tax-inclusive total
- A tip on the full check or pre-tax, split between any number of people
Find the right calculator
4 calculators
Percentages
Purpose-built tools for this task.
Discounts & Everyday Math
Purpose-built tools for this task.
Everyday
Discount Calculator
Sale price and savings from one or two discounts, with optional sales tax on the discounted price.
Everyday
Sales Tax Calculator
Add sales tax to a subtotal, or reverse it out of a total that already includes tax.
Everyday
Tip Calculator
Tip amount, bill total, and the split per person — with an option to tip pre-tax.