Percentage Change Calculator
Enter a starting and ending number to see the percentage increase or decrease between them. Switch modes to find what percent one number is of another, or P percent of a value.
How to calculate percentage change
- Enter the original (from) value and the new (to) value.
- Read the percentage change, shown as positive for an increase or negative for a decrease.
- Use the other modes for 'X is what percent of Y' or 'P percent of N'.
Examples
Price rise from 50 to 75
from 50, to 75
50% increase
Drop from 100 to 80
from 100, to 80
20% decrease
Frequently asked questions
How is percentage change calculated?
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100. From 50 to 75 is (75 - 50) / 50 = 50%.
What does a negative result mean?
A negative percentage means the value went down. Going from 100 to 80 is a 20% decrease, shown as -20%.
Why can't the starting value be zero?
Percentage change divides by the original value, and dividing by zero is undefined, so a starting value of 0 has no meaningful percent change.
What is the difference between percent change and percent of?
Percent change compares two values over time. Percent of asks what share one number is of another, such as 25 being 12.5% of 200.
Is my data private?
Yes. All calculations run in your browser and nothing is uploaded.
Related tools
Proportion Calculator
Solve a proportion a/b = c/d for the missing value. Leave one box blank and get the answer by cross multiplication, instantly and free. No signup needed.
Percentage Calculator
Free percentage calculator. Find a percent of a number, work out what percent one number is of another, and calculate percentage change.
Area Calculator
Find the area of a circle, square, rectangle, triangle, trapezoid, parallelogram, ellipse, sector or rhombus. Free and runs in your browser.
Arithmetic Sequence Calculator
Find the nth term, the sum of n terms and the full term list for any arithmetic or geometric sequence. Enter the first term, step or ratio, and n.
Average Calculator
Find the mean, median, mode, range, sum, count, min and max of a list of numbers. Paste values separated by commas, spaces or new lines.
Big Number Calculator
Add, subtract, multiply, divide, power, modulo, factorial, GCD and LCM on integers of any length. Exact results with no rounding, computed in your browser.