Percentage Increase Calculator
Calculate percentage increase, percentage decrease, and percentage change between two numbers, or apply a percentage increase or decrease to any value.
How to Use the Percentage Increase Calculator
Enter the required values in the fields above and click Calculate. All calculations are executed directly inside your web browser using proven mathematical formulas, ensuring instantaneous results and 100% privacy without transmitting your numbers to remote servers.
Mathematical Formula
Worked Example
If a stock increases from $80 to $100: Change = ((100 - 80) / 80) × 100% = (20 / 80) × 100% = +25% increase.
Common Percentage Change Benchmark Table
| Original Value | New Value | Absolute Change | Percentage Change | Multiplier |
|---|---|---|---|---|
| $50 | $75 | +$25 | +50.0% Increase | 1.50× |
| $80 | $100 | +$20 | +25.0% Increase | 1.25× |
| $100 | $80 | -$20 | -20.0% Decrease | 0.80× |
| $100 | $50 | -$50 | -50.0% Decrease | 0.50× |
| $200 | $300 | +$100 | +50.0% Increase | 1.50× |
Important Notes & Limitations
Percentage change cannot be calculated when the original starting value is zero because division by zero is mathematically undefined. In such cases, the absolute change is shown.
Want an in-depth walkthrough? Read our full guide on How to Calculate Percentage Increase and Decrease → with complete step-by-step examples and formula breakdowns.
This calculator provides estimates based on standard mathematical algorithms (such as compound interest formulas and standard amortization schedules) for budgeting, educational, and analytical scenarios. Actual loan terms, investment yields, taxes, and interest rates vary by financial institution, jurisdiction, and credit profile. This does not constitute certified investment, tax, legal, or financial advice. Consult a licensed financial advisor, CFP®, or CPA before making financial commitments.
Frequently Asked Questions
Subtract the original starting value from the new value, divide the difference by the original value, and multiply by 100. For example: from 50 to 75 is (75 - 50) ÷ 50 = 25 ÷ 50 = 0.50 × 100 = 50% increase.
Because the base changes. If $100 drops by 50%, it becomes $50. A 50% increase on $50 adds only $25, resulting in $75. To recover from a 50% loss, you need a 100% gain.
A percentage point is the simple arithmetic difference between two percentages (e.g. 5% to 7% is a 2 percentage point rise). The percent increase is the relative growth: (7 - 5) ÷ 5 = 40% increase.