Percentage Change Calculator
See how percentages shift between values
Calculate percentage change, percentage of, percentage increase/decrease instantly. The most useful maths tool in finance.
What this tool does
This calculator shows how percentages shift between two values by computing the relative change from a starting amount to an ending amount. Enter your original value and new value to see the percentage movement expressed as a single figure. The result represents the direction and magnitude of change—whether the value has increased or decreased and by what proportion. The calculation is driven entirely by the difference between your two inputs and the size of the original value. This tool works across any context where you're comparing two numbers over time or between scenarios: price movements, quantity adjustments, performance metrics, or any comparable figures. The calculator assumes both values are valid and comparable, and treats the original value as the baseline. Results are educational illustrations of mathematical change, not forecasts or predictions about future values.
Enter Values
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Percentage Change in Finance
Percentage change = (New Value − Old Value) / Old Value × 100. This formula appears in investment returns, salary increases, inflation calculations, and most financial metrics.
Where Percentage Change Applies
Percentage change clarifies salary negotiations, property prices, and savings account rates. Expressing shifts as percentages makes comparison easier than raw numbers alone. A nominal increase on a modest figure differs significantly from the same increase on a large one.
The Direction of Calculation
Reversing the original and new values produces a different result — not just a negative version of the same number. Starting from a lower base produces a larger percentage change than starting from a higher one. This distinction matters when comparing figures across different time periods or contexts.
A worked example
Try the defaults: original value of 1,000, new value of 1,250. The tool returns 25.00%. You can adjust any input and the result updates as you type — no submit button, no reload. The output responds visibly to changes in one or two assumptions.
What moves the number most
The result responds to Original Value and New Value. Adjusting one input at a time toward extreme values shows which ones affect the result most.
The formula behind this
This calculator computes percentage change by dividing the difference between a new and original value by the original value, then multiplying by 100. The result represents the relative change as a percentage. This assumes the original value is non-zero and applies to any numeric comparison. The formula box below shows all calculations, so you can verify the math against your own spreadsheet.
Tracking changes over time
Utility bills often increase gradually. Small annual increases accumulate into meaningful differences across a decade. Running this calculation annually and comparing providers when gaps widen can highlight cost shifts in household expenses.
What this doesn't capture
Usage varies month-to-month; tariffs change; discounts come and go. The figure here is a clean baseline — actual bills will fluctuate around it. Use the calculation to benchmark providers rather than predict a specific bill.
The value changed from 1,000 to 1,250 , representing a 25.00% change.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes percentage change by subtracting the original value from the new value, dividing that difference by the original value, and multiplying the result by 100. The output expresses the relative shift between two values as a percentage. The calculation assumes the original value is non-zero; a zero starting point makes the ratio undefined. The model treats both inputs as static numbers and applies equally to any numeric comparison—financial values, measurements, quantities, or counts. It does not account for time intervals, inflation, fees, taxes, or the direction of change beyond the sign of the result (positive indicating an increase, negative a decrease).
Frequently Asked Questions
How do I calculate percentage change between two numbers?
What is the difference between percentage change and percentage difference?
Why do I get a different answer when I reverse the numbers?
How do I work out a percentage increase on a salary?
Can percentage change be more than 100 percent?
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