Calculators
Percentage Increase Calculator
Calculate the percentage increase or decrease from an original value to a new value locally.
Percentage increase (or decrease) = (new − original) ÷ original × 100. The original value is the baseline. This calculator runs privately in your browser; your numbers are not uploaded or stored.
Percentage increase FAQs
How is this different from percentage difference?
Percentage increase compares a new value with one original baseline. Percentage difference compares two values without treating either one as the baseline.
What happens with zero or negative values?
A zero original value has no defined percentage change, so it is rejected. Negative values are accepted; the signed result follows the same formula and can be a decrease even when the numbers look larger.
Are my values private?
Yes. Calculation happens locally in this browser, and this tool does not upload or store the values.
Compare a new value with its original baseline.
Enter an original value and a new value to calculate percentage change: (new − original) ÷ original × 100. A positive result is an increase and a negative result is a decrease. Zero cannot be used as the original baseline because percentage change would be undefined. Your values stay in your browser and are not uploaded or stored.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
What formula does the percentage increase calculator use?
It uses percentage change = (new value − original value) ÷ original value × 100. A positive answer is an increase, while a negative answer is a decrease.
Why can’t the original value be zero?
The original value is the denominator and baseline in the formula. Dividing by zero is undefined, so the calculator asks for a nonzero original value.
How is percentage increase different from percentage difference?
Percentage increase uses a defined original value and reports direction. Percentage difference treats the two values equally and divides by their average, so it does not use an original baseline.
Can I use negative values, and do my values stay private?
Yes. Negative values are accepted and the signed result follows the same formula. Calculation and copying happen locally in your browser, and CodeASystem does not upload or store the values you enter.