Everyday math made simple

Percentage, pricing and tax tools organized by real use case

Browse calculators by shopping, pricing, business math and basics, so you can find the right tool faster.

Focus: fast calculators, plain-language guides, and practical examples for common percentage and pricing questions.

Shopping

Tools for discounts, sale prices and tax checks.

Pricing

Tools for markup, margin, profit and price structure.

Business math

Tools for change, targets, deductions and growth.

Basics

Core percentage tools and conversions.

Frequently asked questions

What is the basic percentage formula?

Divide the part by the whole, then multiply by 100.

How do I calculate a discount?

Find the savings first, then subtract that savings amount from the original price.

What is the difference between markup and margin?

Markup is based on cost, while margin is based on selling price or revenue.

How do I measure percentage change?

Subtract the old value from the new value, divide by the old value, then multiply by 100.