Percentage Calculator
Every common percentage question in one place: percent of a number, what percent one number is of another, percentage increase or decrease, plus discount, sales tax and tip. Answers update as you type and show how they were worked out.
What “calculated on your device” means for this tool
When you open this page, your browser downloads the calculator itself, the same way any web page loads. From then on, every calculation happens inside your browser, on your own device. The numbers you type are never sent to this website's server or to anyone else, and nothing is saved.
Visit counting: this site counts visits with privacy-friendly analytics. No cookies, no ads, no tracking across other sites, and your IP address is not stored. It records which page you opened, your country, your device type and how long you stayed.
Percent of a number
What percent is it?
Percentage increase or decrease
Add or take off a percentage
Find the whole
Percentage difference
Discount & sales tax
Tip & split the bill
How to use the Percentage Calculator
- Find the card for your question, like “Percent of a number”.
- Type your numbers in the sentence.
- The answer updates as you type, with the sum underneath.
- Use Discount & sales tax or Tip & split the bill for shopping and eating out.
Questions
How do I work out a percentage of a number?
Divide the percentage by 100 and multiply by the number. 20% of 150 is 0.2 × 150 = 30.
How do I calculate percentage increase?
Take the new number minus the old one, divide by the old one and multiply by 100. Going from 80 to 100 is (100 − 80) ÷ 80 × 100 = a 25% increase.
Why is a 50% drop then a 50% rise not back to the start?
Because the second percentage is of a smaller number. 100 drops 50% to 50, and 50% of 50 is only 25, so you end at 75.
What is the difference between percentage change and percentage difference?
Change measures from a starting value (old to new). Difference compares two values with no starting point, using their average, so it is the same whichever way round you enter them.
How much should I tip?
In the US, 15% to 20% at a sit-down restaurant is usual, 18% to 20% for good service. Tap a tip button and the split shows what each person owes.
Popular uses: Tip Calculator & Bill Splitter
Still stuck, or want a tool that isn't here? Ask on the Nebula Discord.