Percentage Calculator
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Practice Mode
Try the question first. Check your answer when you’re ready.
What to understand
Percent means “per 100”
25% means 25 out of every 100. A percent can be written as a fraction over 100 or as a decimal.
Percent change has a direction
Compare the change with the starting value. A positive result is an increase; a negative result is a decrease.
⚡ Percentage Shortcut Vault
10%
Move to one tenth: divide the number by 10.
5%
Find 10%, then take half.
25%
Take one fourth: divide by 4.
50%
Take one half: divide by 2.
Check: Estimate the size of the answer. A percent below 100% of a positive number should give a smaller amount.