How it works
Subtract the original from the new value, divide by the absolute original, multiply by 100. A positive result is an increase; negative is a decrease.
Math calculators
Percentage Change Calculator
Calculate percentage increase or decrease between two numbers.
Complete guide
How to use Percentage Change Calculator
The Percentage Change Calculator finds the percentage difference between an original value and a new value. A positive result means an increase; a negative result means a decrease.
Formula: ((New - Original) / |Original|) × 100. This is commonly used for price changes, population growth, sales comparisons, and financial reporting.
Common uses
Price increases, discount validation, revenue growth, salary raises, population change, exam score comparison.
Percentage change vs percentage difference
Percentage change measures change from a reference value. Percentage difference compares two values without a reference direction.
Answers
Percentage Change Calculator FAQs
What is the formula for percentage change?
((New value - Original value) / Original value) x 100.
How do I calculate a price increase?
Subtract the old price from the new price, divide by the old price, multiply by 100.
What is a percentage decrease?
A negative percentage change - when the new value is lower than the original.
How do I calculate a 20% increase?
Multiply the original by 1.2. For example, 20% increase on 100 = 120.
Is percentage change the same as percentage difference?
No. Percentage change uses a base value as reference. Percentage difference compares two values symmetrically.
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Methodology and examples
Percentage Change Calculator - Free % Increase & Decrease: formula, example, and use cases
Maintained by FormatNest. Verify assumptions and sources before using results.
Formula or method
The calculator applies the relevant percentage relationship: amount = base × rate ÷ 100, then reports the requested total, difference, margin, or ratio.
Worked example
Example: enter the price, income, cost, or base amount from a real transaction in Percentage Change Calculator - Free % Increase & Decrease, then compare the percentage result before making a decision.
Best use cases
Use Percentage Change Calculator - Free % Increase & Decrease when you need a fast browser-based estimate, comparison, or planning result without creating an account.
Important: Check the assumptions and inputs before relying on this estimate for an important decision.
Editorial note: Review the input definitions, units and assumptions before relying on results. For corrections, contact FormatNest with your inputs and expected result.