Our free Percentage Change Calculator helps you instantly compute the percent increase or decrease between any two values. Whether you're tracking stock price changes, comparing sales growth, analyzing revenue trends, or measuring weight loss progress — this tool delivers fast, accurate results using the standard percentage change formula.
Choose % Change to find how much a value increased or decreased in percentage terms. Choose % Of to find what percentage the final value is of the initial value.
Type your starting value in the "Initial Value" field. For example, the original price of a product, a stock's opening price, or last month's revenue figure.
Type the new or ending value in the "Final Value" field — the current price, today's figure, or the value after a change has occurred.
Hit the Calculate button to instantly see the percentage change and the absolute difference between the two values displayed on the result panel.
A positive % means an increase; a negative % means a decrease. The chart gives you a quick visual comparison of both values.
Use the Reset button to clear all fields and start a fresh calculation. Use the Share button to copy the link and share your result with others.
Initial Value (X1) — the starting number (e.g., stock price on Day 1). Final Value (X2) — the ending number (e.g., stock price today).
Find the raw change. A positive result = increase. A negative result = decrease.
Change = X2 − X1
Get the relative (proportional) change so you can compare values of any size.
Relative Change = (X2 − X1) / X1
Convert the decimal to a human-readable percentage.
% Change = Relative Change × 100
Calculate the percent gain or loss on stocks, ETFs, or cryptocurrency holdings between any two price points.
Measure month-over-month or year-over-year revenue growth to benchmark business performance.
Find out exactly how much a product's price has increased or decreased after a sale, tax, or markup.
Track weight loss or gain, BMI changes, or workout progress as a percentage of your starting measurement.
Evaluate how much a student's test score improved or declined between exams or semesters.
Compare electricity, water, or gas bills across months to detect usage spikes or savings.
Percentage change measures how much a quantity has increased or decreased relative to its original value, expressed as a percentage. A positive result means growth; a negative result means a decline. The formula is: % Change = ((New − Old) / Old) × 100.
% Change tells you how much a value grew or shrank relative to the starting point (e.g., "sales increased 20%"). % Of tells you what fraction of one value another is (e.g., "the final value is 120% of the initial value"). Use % Change for trend analysis and % Of for ratio analysis.
Yes! If a value more than doubles, the percentage increase exceeds 100%. For example, if a stock goes from $50 to $150, the percentage change is +200%. There is no upper limit on percentage increase.
Percentage change is mathematically undefined when the initial value is zero (division by zero). In such cases, consider using the absolute difference or a different metric like growth rate from a base period.
No. Percentage change uses the original/initial value as the reference point (directional — from old to new). Percentage difference uses the average of both values as the reference and has no direction. Use percentage change for before/after comparisons and percentage difference when comparing two equal-weight values.
Digital marketers use percentage change to track organic traffic growth, compare conversion rate changes, measure CTR improvements, and report ROI on ad spend. Enter last month's sessions as the initial value and this month's as the final value to get the exact growth percentage instantly.