Percentage calculator
Calculations that should be easy but never are. Quickly solve percentage increases, decreases, and common math problems.
1. Percentage of a Number
2. Percentage Change (Inc/Dec)
3. Reverse Percentage
Percentage math made simple
I genuinely believe humans aren't built for percentage math. We use it for tips, sales, taxes, and stock market gains, yet most of us still reach for a calculator every time. This page is designed to be your permanent "math tab"—open it, solve your problem, and get back to your life.
How do I calculate percent increase manually?
To calculate percentage increase: 1. Subtract the original number from the new number. 2. Divide that result by the original number. 3. Multiply by 100.
What is 20% off $100?
It's $80. You take the original price ($100), multiply it by 0.20 to get the discount ($20), and subtract that from the original ($80).