Percentage Calculator
Math & Calculators
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About This Tool
Free, private, serverless percentage calculator with 5 modes: X% of Y, X is what % of Y, percentage change, increase/decrease by %, and tip calculator. Real-time results as you type. 100% client-side — no data leaves your browser.
How to Use
- Choose a calculation mode from the five available sections.
- Enter your numbers in the input fields.
- Results update instantly as you type — no button click needed.
- Use the Tip Calculator for quick restaurant bill calculations.
Frequently Asked Questions
How many calculation modes are available?
Five modes: (1) X% of Y, (2) X is what % of Y, (3) Percentage change between two values, (4) Increase or decrease a number by a percentage, (5) Tip calculator for restaurant bills.
Do I need to click a button?
No. Results update in real-time as you type. All calculations happen instantly as you modify any input field.
How precise are the results?
Results are displayed with up to 4 decimal places for fractional numbers. Integer results are shown without decimals for clean readability.
What does the percentage change calculator do?
It calculates the percentage increase or decrease from one value to another. Positive results (shown in green) indicate an increase, while negative results (shown in red) indicate a decrease.
Does it work offline?
Yes. All calculations happen in your browser. No data is transmitted to any server.
Guides & Tutorials
In-depth guides for every tool. Learn how to process your data privately, for free, right in your browser.
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