Math Calculators
Our free math calculators help you work out percentages, discounts, scientific sums and random numbers in seconds. Moreover, every tool is simple and needs no sign-up. As a result, you can solve homework, shopping and everyday problems quickly.
- 5 math tools
- Free to use
- Instant results
Free Math Calculators
Pick a calculator below. Each one opens on its own page.
Find a percentage, an increase or a percentage change.
Open calculatorWork out the sale price after a discount.
Open calculatorSolve harder sums with an online scientific calculator.
Open calculatorPick a random number within any range you choose.
Open calculatorFlip a fair coin for heads or tails, and see your running totals.
Open calculatorWhich of Our Math Calculators Should You Use?
Match your question to the right tool.
| If you want to know | Use this calculator |
|---|---|
| What 15% of a number is, or how much a value changed | Percentage Calculator |
| The price you pay after a sale | Discount Calculator |
| The answer to a harder maths problem | Scientific Calculator |
| A fair random pick for a game or a draw | Random Number Generator |
| A quick heads-or-tails decision | Coin Flip |
How to Get Accurate Answers Every Time
Check your numbers before you press calculate. For example, make sure you typed the right digits and used the right unit. In addition, remember that a percentage depends on the base number, so always check which number you start from.
For schoolwork or official figures, compare your result with a second method. If you want to learn the topic in more depth, Khan Academy’s free maths lessons explain percentages and other basics step by step.
Frequently Asked Questions
Are these math calculators free?
Yes. Every calculator on CalcPro is free, and you do not need an account.
How do I find a percentage of a number?
Multiply the number by the percentage, then divide by 100. For example, 25% of 80 is 80 × 25 ÷ 100, which equals 20. The Percentage Calculator does this for you.
How do I work out a sale price?
Subtract the discount from the original price. The Discount Calculator shows the final price and how much you save.
Is the coin flip fair?
It simulates a fair flip, so heads and tails have the same chance. Short runs can still look uneven, because chance does not follow a pattern.
Do these tools work on my phone?
Yes. All tools work on phones, tablets and computers.