Percentage Change Calculator
Calculate percentage increase, decrease, difference and reverse percentages.
Result
- Change
- 20
- Percentage change
- 25%
- Percentage difference
- 22.22%
Percentage change = (new − original) ÷ |original| × 100
About this calculator
Percentage change compares the difference with the original value. Percentage difference compares two values with their average.
Formula: Percentage change = (new − original) ÷ |original| × 100
Frequently asked questions
- What does the Percentage Change Calculator do?
- Calculate percentage increase, decrease, difference and reverse percentages. Percentage change compares the difference with the original value. Percentage difference compares two values with their average.
- Is the Percentage Change Calculator free to use?
- Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.
- How accurate is the Percentage Change Calculator?
- Results are calculated in real time using the formula Percentage change = (new − original) ÷ |original| × 100. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified finance professional before committing to a purchase or a job.
- What inputs does the Percentage Change Calculator need?
- Enter values for: Original value, New value. Sensible defaults are pre-filled where possible so you can start with a single change.
- Can I embed the Percentage Change Calculator on my own website?
- Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.
Mini Course
New
30 min
Go deeper on this topic
Personal Finance Foundations in 30 Minutes
Compound interest, inflation and cash-flow explained clearly — then applied to your own numbers.
What you'll learn
- Read the maths behind compound growth
- Model inflation against real returns
- Choose between debt avalanche vs snowball
- Set a retirement target you can actually hit
Price
$15
Instant access · lifetime updates
Keep calculating
Useful tools for the next step
ecommerce
Discount & Sale Price Calculator
Calculate sale price, savings, stacked discounts, tax and reverse original price.
finance
Compound Interest Calculator
Project savings growth with regular contributions and compounding interest.
finance
Mortgage Calculator
Monthly mortgage payment, total interest and amortisation summary.
finance
EU VAT Cross-Border Calculator
Net/gross split, VAT amount and OSS reporting flag for a cross-border B2C sale inside the EU.
finance
Business Loan Amortization Calculator
Monthly payment, total interest and full amortization schedule for a business term loan.
finance
Compound Interest & Wealth Projection Calculator
Project long-term wealth from a starting balance, recurring contributions and an annual return, with year-by-year compounding.
finance
Inflation-Adjusted Purchasing Power Calculator
See what a sum of money today will be worth in future purchasing power — and how much you'd need in the future to buy the same basket today.
finance
Debt Avalanche vs Snowball Payoff Strategy Calculator
Compare Avalanche (highest APR first) vs Snowball (smallest balance first) payoff on up to five debts — see months saved and interest saved.
finance
NPV & IRR Business Investment Calculator
Discount up to 6 years of projected cash flows to Net Present Value, and solve for the Internal Rate of Return of the investment.
finance
Stock/ETF Investment Expense Ratio Impact Calculator
See how much of your future wealth is eaten by ETF or mutual-fund expense ratios — compare a low-cost index fund against a higher-cost active fund side by side.