General Calculators
The calculations you reach for every day: an online calculator with parentheses and keyboard support, a percentage calculator, and a discount calculator for shopping and pricing.
- CalculatorA free calculator with percentages, parentheses and full keyboard support.
- Percentage CalculatorEnter two numbers and get every common percentage answer at once.
- Discount CalculatorEnter the price and discount to see exactly what you pay and how much you save.
- Tip CalculatorEnter the bill and tip percentage to see what each person owes.
What are general calculators for?
General calculators cut the most common everyday sums down to a few seconds: arithmetic, percentages, discounts and tips. There is no formula to remember; the result appears as you type.
Use them to see what a sale price will cost at the till, how much a price has risen, or what each person owes when the bill arrives.
CalculatorPercentage CalculatorDiscount CalculatorTip Calculator
How do you work out a percentage?
To find a percentage of a number, multiply the number by the rate and divide by 100: 15% of 400 is 400 × 15 ÷ 100 = 60. To find the percentage change between two numbers, divide the difference by the old value and multiply by 100.
The percentage calculator answers “what percent of”, “percent change” and “X% of” at once, and the discount calculator also handles discounts applied one after another.
Why does the online calculator follow the order of operations?
The online calculator applies the mathematical order of operations: parentheses first, then multiplication and division, then addition and subtraction. That is why 2 + 3 × 4 gives 14, not 20.
Some simple phone calculators work strictly left to right and give a different answer. When you type a long calculation on one line, parentheses make sure you and the calculator mean the same thing.
Frequently Asked Questions
Are these calculators free?
Yes. Every calculator is free, needs no account and runs in the browser on phones and computers.
Are the numbers I enter stored?
No. Calculations run in your browser; the values you enter are not sent to the server.
Where do I find more specialised calculators?
Loans, tax, health, dates, unit conversion and other topics have their own sections in the menu at the top, or you can use the search box.