Instantly calculate percentages, discounts, tips & more. No signup required, works on any device.
How to Use Each Percentage Calculator
What is X% of Y?
This is the most common percentage question. Enter the percentage and the number, and the calculator instantly shows the result. The formula is (percentage ÷ 100) × number. Use this for calculating sales tax, discounts, commissions, or splitting costs.
Example: You're buying a $649 phone and the sales tax is 8%. Enter 8% of 649 to find out the tax is $51.92 before you reach the register.
X is What Percent of Y?
Use this when you want to find a percentage relationship between two numbers. The formula is (X ÷ Y) × 100. Useful for grades, survey results, or progress tracking.
Example: You got 38 out of 50 questions right on a test. Enter 38 and 50 to find out that's 76%.
Percentage Increase & Decrease
This calculator shows how much something has changed relative to its original value. The formula is ((new value − original value) ÷ original value) × 100. A positive result means an increase; negative means a decrease.
Example: Your electricity bill was $95 last month and $112 this month. Enter both numbers to see that's an 17.9% increase.
Discount Calculator
Enter an original price and a discount percentage to instantly see your savings and final price. The formula is savings = price × (discount ÷ 100). Perfect for shopping, budgeting, and retail analysis.
Example: A winter jacket is marked 35% off its regular price of $220. Enter those numbers to see you save $77 and pay $143.
Tip Calculator
Enter your bill total and a tip percentage to calculate how much to tip and your grand total. A standard restaurant tip is 15–20%. The formula is tip amount = bill × (tip% ÷ 100).
Example: Dinner comes to $58 and you want to tip 18%. Enter both numbers to find the tip is $10.44 and your total is $68.44.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage, then divide by 100. Example: 20% of 150 = (150 × 20) ÷ 100 = 30. Use the "What is X% of Y?" calculator above to do this instantly.
How do I find what percentage one number is of another?
Divide the first number by the second, then multiply by 100. Example: 30 is what percent of 150? (30 ÷ 150) × 100 = 20%. Use the "X is what % of Y?" calculator above.
How do I calculate a percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100. Example: price went from $50 to $65: ((65 − 50) ÷ 50) × 100 = 30% increase.
What is a good tip percentage?
In North America, 15% is considered standard, 18–20% is good, and 20–25% is generous. Use the tip calculator above to quickly find the amount for any bill.
How do I calculate the final price after a discount?
Multiply the original price by the discount percentage divided by 100 to find the savings, then subtract from the original price. Example: $80 item at 25% off: savings = $20, final price = $60.
Can I use this calculator on my phone?
Yes, this percentage calculator is fully mobile-optimized. All five calculators work on any device, and number inputs use a numeric keyboard on mobile for easy entry.
Why are percentages important?
Percentages are used in everyday life for shopping discounts, restaurant tips, financial growth, budgeting, grades, and comparing values. They express proportions and changes in a universal, easy-to-understand format.
This little calculator started as something I wanted for myself. I kept Googling percentage questions and getting cluttered pages that made it harder than it needed to be. So I built something simple, and I hope it saves you a few seconds too.
If you found it useful, that genuinely makes my day. If something doesn't work the way you expected, I'd love to hear about it. This site is just one person trying to make a small corner of the internet a little more helpful.
Thank you for visiting. Take care out there.
