Discount calculation
If an item drops from $120 to $90, the change is -25%. That means the sale price is 25% lower than the original price.
Price increase and decrease calculator
Percentage Change Calculator
Enter an original price and a new price to calculate the percent increase or decrease, the absolute price change, and a short explanation of what the result means.
Transparent math
Formula shown: Yes
Works offline after load: Yes
Last updated: July 1, 2026
Before and after values
Calculate price percentage change
Result
Price change
Change type
Formula used
How to use this percentage change calculator
- Enter the original price in the first field.
- Enter the new price after the increase, decrease, discount, or comparison.
- Choose a currency and decimal precision if needed.
- Read the percentage change, absolute price change, formula, and short explanation.
Percentage change formula
The standard formula is:
(New Price - Original Price) / Original Price x 100
A positive result means the price increased. A negative result means the price decreased. If the original price is zero, percentage change is undefined because division by zero is not valid.
Practical price examples
Price increase
If a subscription rises from $20 to $24, the increase is 20%. This helps compare a price change against your budget.
Comparing two sellers
If one seller charges $48 and another charges $60, the second price is 25% higher than the first price.
When this calculator is useful
- Checking whether a sale discount is meaningful.
- Measuring a rent, utility, subscription, or product price increase.
- Comparing before-and-after prices from different stores.
- Explaining a markup, markdown, or price adjustment in plain numbers.
Methodology and quality notes
This calculator uses the standard arithmetic percentage change formula: subtract the original value from the new value, divide by the original value, and multiply by 100. The result is relative to the original value, which is why the same dollar change can produce a different percentage depending on the starting price.
Results are rounded only for display. The calculation itself uses the entered values and does not pull live store prices, tax rates, shipping fees, market quotes, coupon rules, or product data. If your real-world comparison includes tax, shipping, rebates, subscriptions, or stacked discounts, the percentage change is only one part of the decision.
Data and source notes: No external data source is required because this page performs a pure arithmetic calculation. For shopping totals with coupons and sales tax, use the related discount calculator below.
Editorial note: This page is maintained by CalcToolBox as a simple math utility. The formula, assumptions, examples, and limitations are shown on the page so users can verify the calculation rather than relying on a hidden method.
Last reviewed: July 1, 2026.
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FAQ
How do I calculate percentage price increase?
Subtract the old price from the new price, divide by the old price, then multiply by 100. For example, $100 to $125 is a 25% increase.
How do I calculate percentage price decrease?
Use the same formula. If the new price is lower, the result will be negative. For example, $80 to $60 is a -25% change.
Is percentage decrease the same as discount percentage?
For a simple sale price, yes. Original price is the old price, and sale price is the new price. If coupons, tax, shipping, or fees are involved, use a full discount calculator.
Why is percentage change undefined when the original price is zero?
The formula divides by the original price. Division by zero is not valid, so a percentage change from zero cannot be calculated with this formula.
Can I use this for non-price values?
Yes. The same formula works for many before-and-after numbers, such as traffic, sales, quantity, or measurements, as long as the original value is not zero.
What is the difference between percentage change and percentage point change?
Percentage change compares relative movement from an old value to a new value. Percentage point change is the simple subtraction between two percentages, such as 7% minus 5% equals 2 percentage points.
Why can a 50% decrease followed by a 50% increase fail to return to the starting price?
Each percentage change uses its own starting value. If $100 falls 50% to $50, a later 50% increase is based on $50, so the new value becomes $75 rather than $100.
This calculator is for general informational purposes and simple arithmetic checks. For financial, tax, legal, business, or purchasing decisions, verify results and assumptions with a qualified professional or the relevant provider.