Percentage Calculator
Solve everyday percentage problems instantly — X% of Y, what percent, percent change, tips, discounts, and grade scores. Nothing leaves your browser.
More calculators
Companion tools that run entirely in your browser.
Percentage Change Calculator
Measure how much a value increased or decreased as a percentage.
Tip Calculator
Calculate tip amount, total bill, and per-person split.
Discount Calculator
Apply a sale percentage and see final price and savings.
Fraction to Percent Converter
Convert any fraction to an equivalent percentage.
Percentages in everyday life
From restaurant tips and sale discounts to exam scores and business KPIs, percentages express parts of a whole as a number out of 100. Our tools cover the most common scenarios without spreadsheets or mental math.
Privacy-first math
Your financial figures and grades stay on your device. After the page loads, open your browser Network tab — there are no requests carrying your inputs.
Frequently asked questions
How do I calculate X% of Y?
Multiply Y by X and divide by 100. Example: 15% of 200 = 200 × 15 ÷ 100 = 30. Our calculator handles this instantly.
What is percentage change?
Percentage change = ((new − old) ÷ |old|) × 100. It shows relative increase or decrease between two values.
Do you store my numbers?
No. Calculations run entirely in your browser. Your inputs are never sent to our servers.
Can I use this for restaurant tips?
Yes. Enter the bill, tip percentage, and number of people to split. Common US tips are 15–20%.