# Percentage Increase Calculator Canonical URL: https://thinkquarry.com/tools/percentage-increase-calculator/ Last modified: 2026-10-25T16:00:57+00:00 Calculate percentage increase or decrease, find a new value, or work backwards to the original. Free calculator with clear steps and practical examples. Enable JavaScript for interactive calculations. The formula, examples and FAQs below remain available. ## Percentage Increase Calculator Understand what changed. Compare two values, apply a percentage, or find the original amount. 200 → 250Clicks: 400 → 600100 → 80 Calculations run in your browser. This tool does not transmit or save your inputs. Your resultReady to calculate Enter your values, then select Calculate. ## How we worked it out The steps will appear here. Copy result ## How to calculate percentage increase between two numbers Subtract the original value from the new value, divide the difference by the original value, and multiply by 100. Percentage change = ((new − original) ÷ original) × 100 For example, a subscription that rises from 200 to 250 costs 50 more. Divide 50 by 200, then multiply by 100: the price increased by 25%. A positive result indicates an increase; a negative result indicates a decrease. ## Which percentage calculation do you need? Compare two values: 400 clicks becoming 600 clicks is a 50% increase. Compare equivalent periods and units for a meaningful result. Apply a percentage: multiply the original by (1 + percentage ÷ 100). Increasing 80 by 15% gives 92. Enter a negative percentage to calculate a decrease. Find the original: divide the final amount by (1 + percentage ÷ 100). If a package costs 120 after a 20% increase, the original price was 100. ## Percentage Calculator Find X% of a value: 15 ÷ 100 × 200 = 30. Or find what percent one number is of another: 30 ÷ 200 × 100 = 15%. A part can exceed the whole; 300 is 150% of 200. ## Percentage Difference Calculator Use this when neither number is the baseline. Divide the absolute difference by the average, then multiply by 100. For 100 and 150: 50 ÷ 125 × 100 = 40%. Reversing the inputs gives the same 40%. Percentage change from 100 to 150 is 50%, because it uses the original as the base. Percentage difference = |first − second| ÷ ((first + second) ÷ 2) × 100 ## Everyday technology examples ExampleBefore → afterChangeInternet speed50 → 75 Mbps50% increaseCloud storage usage80 → 100 GB25% increaseSoftware price1,000 → 1,20020% increaseA capacity increase does not necessarily imply an equal performance improvement. Doubling RAM capacity, for example, does not automatically double computer speed. ## Frequently asked questions What happens when the original value is zero?Percentage change is undefined because it requires division by zero. Report the absolute change instead. Going from zero to 100 is an increase of 100 units, not a 100% increase. Can an increase be greater than 100%?Yes. Moving from 100 to 300 is a 200% increase. The final amount is three times the original. Can I calculate a decrease?Yes. A lower new value produces a decrease. Moving from 200 to 150 is a 25% decrease. The new-value mode also accepts negative percentages down to −100%. Are percentage points the same as percent increase?No. A click-through rate moving from 2% to 3% rises by one percentage point, but the relative increase is 50%. Why does reversing the numbers change the percentage?The original value is the denominator. Moving from 100 to 150 is a 50% increase, while moving from 150 to 100 is a 33.33% decrease. Does this support negative balances?No. Negative starting values can produce misleading interpretations. This tool uses positive original values and non-negative final amounts. It does not silently apply an absolute-value convention. How are small changes and decimals displayed?Results use up to six decimal places; extremely small nonzero values use scientific notation. Calculations use JavaScript floating-point arithmetic, so displayed figures are approximate. How is percentage difference different from percentage change?Change uses an original value and shows direction. Difference uses the average of two values and is symmetric. For 100 and 150, the increase is 50%, while the percentage difference is 40%. Can percentage difference include a zero?One zero and one positive value give a 200% difference. Two zeros have an average of zero, so this calculator reports the percentage difference as undefined. ## Formula references Wolfram MathWorld: percentage change · Pearson: forward and reverse calculations · ONS: percentage points ThinkQuarry · A straightforward tool for everyday calculations. For worked examples and common mistakes, read our guide on how to calculate percentage increase between two numbers. Explore more free ThinkQuarry tools, including our slope calculator and customer lifetime value calculator.