Find a percentage of a value
(percentage / 100) * base valueUse this when you want to know what X% of Y equals.
Mathematics
Percentage calculator
Calculate percentages, parts of a total, and percentage changes with clear formulas.
Calculate a percentage
Formulas used
Find a part as a percentage
(part / total) * 100Use this when you want to know what percentage one value represents.
Percentage change
((final - initial) / |initial|) * 100The absolute initial value is used so the sign represents increase or decrease.
Examples
15% of 200
percentage = 15, base value = 200
result = 30
45 out of 180
part = 45, total = 180
result = 25%
From 120 to 150
initial = 120, final = 150
result = 25% increase
FAQ
Can I use negative values?
Yes. Negative values are accepted when the formula is mathematically defined.
Why is zero rejected in some modes?
The total and initial value cannot be zero because those formulas would divide by zero.