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Calculate percentages quickly and easily
10%
0.1
1/10
25%
0.25
1/4
50%
0.5
1/2
75%
0.75
3/4
A 20% discount on $100 saves you $20. Stack multiple discounts for bigger savings!
7% annual returns double your money in about 10 years (Rule of 72).
15-20% is standard for tips. On $50, that's $7.50 to $10.
The 50/30/20 rule: 50% needs, 30% wants, 20% savings.
To find 25%, divide by 4. To find 10%, move the decimal left.
Going from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.
What is X% of Y?
(X / 100) × Y
X is what % of Y?
(X / Y) × 100
% Change
((New - Old) / Old) × 100