# Calculate percentage with a calculator

Learn how to work out percentages on a calculator with our detailed instructions for calculator models with and without the % key.

Also see: How to find percentage with pen and paper?

#### a) Find 30% of 450

On a calculator without [%] key, press 30 [÷] 100 [×] 450 [=]

On a calculator with [%] key, press 450 [×] 30 [%]

#### a) What percentage is 30 of 50?

On a calculator without [%] key, press 30 [÷] 50 [×] 100 [=]

On a calculator with [%] key, press 30 [÷] 50 [%]

#### c) 25% of what number is 150?

On a calculator without [%] key, press 150 [×] 100 [÷] 25 [=]

On a calculator with [%] key, press 150 [÷] 25 [%]