Percentage Calculator
Calculate percentages, percentage increase and decrease online free — find percent of a number, ratio, and difference instantly.
Last updated: 10 October 2026
Three modes in one tool: find X% of Y, find what percent X is of Y, and compute percentage change between two numbers. Verified: 15% of 250 = 37.5, 45 is 25% of 180, and the change from 200 to 260 is a 30% increase.
Percentage Calculator
What is X% of Y?
Worked Examples
Verified calculations
- 15% of 250 → 37.5
- 45 as a percentage of 180 → 25%
- Percentage change from 200 to 260 → 30% increase
Everyday uses
- Discounts: 30% off $84.99 → the reduction is $25.50, price $59.49.
- Tips: 18% of $67.50 → $12.15.
- Successive discounts do not chain — apply each one to the running price in turn.
Screenshots
About Percentage Calculator
Calculate percentages, percentage increase, percentage decrease, and percentage change. Three modes: find X% of Y, find what percent X is of Y, and calculate percentage change. We tested by calculating 15% of 250 (result: 37.5), finding what percent 45 is of 180 (result: 25%), and computing percentage change from 200 to 260 (result: 30% increase) — all matched manual calculations.
Limits: Does not handle chained percentages (e.g., successive discounts) — calculate each sequentially; Maximum input value depends on JavaScript number precision (~15 significant digits); Results are not rounded by default — full decimal precision is shown
Who Uses This Tool
- A shopper calculating a 25% discount on a $180 jacket to see the sale price before checkout
- A student figuring out what percent they scored on a test (72 out of 90 = 80%)
- A manager computing the 12% year-over-year revenue increase from $450K to $504K
Key Features
- Three calculation modes
- Instant results
- Handles decimals
- Negative number support
How to use Percentage Calculator
- Choose the calculation mode.
- Enter the values.
- See the result instantly.
How It Compares
Unlike Calculator.net's percentage calculator which shows ads and requires page reloads, this tool updates results instantly as you type. It also provides three core modes without the clutter of unrelated calculators or paid upsells.
Privacy & Security
Because processing happens directly in your browser, your files and input are not uploaded to our servers.
Written and checked by Mohammad Sohail
Calculations re-checked on 10 October 2026 against the values listed above.
About FreeDigitalToolkit →Frequently Asked Questions
What calculation modes are available?
X% of Y, X is what % of Y, and percentage change from X to Y.
How do I calculate a tip or discount?
Use the 'X% of Y' mode. Enter the tip percentage and the bill amount to find the tip value.
Can I calculate percentage increase or decrease?
Yes. Use the percentage change mode and enter the original and new values. Positive result means increase, negative means decrease.
Does it handle negative numbers?
Yes. You can enter negative values for percentage change calculations. Negative results indicate a decrease.
How accurate are the results?
Results are calculated to full decimal precision. For most real-world uses, rounding to 2 decimal places is sufficient.
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