How to Calculate a 15% Tip

Find out Math Dude's trick to quickly and easily calculate a 15% tip.

Jason Marshall, PhD
1-minute read

If you want to leave a 15% tip, use the fact that 15% = 10% + 5%.

Calculate 10% of the bill by moving the decimal point one position to the left. Then, take that number, divide it in half, and add the new amount to the original 10%.

For more, see How to Use Percentages to Easily Calculate Tips

About the Author

Jason Marshall, PhD

Jason Marshall is the author of The Math Dude's Quick and Dirty Guide to Algebra. He provides clear explanations of math terms and principles, and his simple tricks for solving basic algebra problems will have even the most math-phobic person looking forward to working out whatever math problem comes their way.