Math Calculators

Free online math calculators for averages, statistics, percentages, and everyday number crunching.

Area of a Circle Calculator

Calculate the area of a circle from its radius, diameter, or area. Enter any one value and the other two update instantly.

Area of a Rectangle Calculator

Calculate the area, perimeter, and diagonal of a rectangle. Enter any two values and the rest update instantly.

Average Calculator

Find the mean, median, mode, range, sum, and more for any list of numbers. Enter values separated by commas or spaces.

Discount Calculator

Calculate the final price after a percentage or fixed discount — with optional tax. See exactly how much you save in seconds.

Percentage Calculator

Calculate percentages instantly — find what percent of a number is, determine what percentage one value is of another, or find the percentage change between two numbers.

Percentage of a Percentage Calculator

Calculate a percentage of another percentage — find the result, work backwards to find the base, or find what percentage one value is of another.

Speed Calculator

Calculate speed, distance, or time. Enter any two values and the third is computed instantly. Supports metric, imperial, and nautical units.

30-60-90 Triangle Calculator

Calculate the short leg, long leg, hypotenuse, area, and perimeter of a 30-60-90 triangle. Enter any one value and all others update instantly.

45-45-90 Triangle Calculator

Calculate the leg, hypotenuse, area, and perimeter of a 45-45-90 triangle. Enter any one value and all others update instantly.

About Math Calculators

Math calculators on EasyCalc are built for practical, everyday use — the kinds of problems that come up in school, work, data analysis, and daily life. No advanced mathematics required: enter your numbers, click Calculate, and get a clear result with the key statistics shown at a glance.

What You Can Calculate

  • Averages — find the mean, median, and mode of any set of numbers
  • Statistics — see the range, minimum, maximum, and total alongside the average
  • Percentages — coming soon
  • And more — new calculators are added regularly

Why Use an Online Calculator

Online calculators are faster than spreadsheet formulas for quick one-off calculations, and more reliable than doing the math in your head. They work the same way on any device — phone, tablet, or computer — with no installation needed.

Frequently Asked Questions

What kinds of math can I do with these calculators?

The calculators cover practical everyday math: finding averages and statistical measures like median and mode, working with percentages, and other common calculations you'd normally reach for a spreadsheet or app to solve.

Are these calculators free?

Yes. Every calculator on EasyCalc is free to use with no sign-up, no download, and no usage limits.

Do the calculators handle decimal numbers?

Yes. All math calculators accept decimal numbers such as 3.14, 0.5, or 99.99. Just use a period as the decimal separator.

How accurate are the results?

Results are calculated using standard floating-point arithmetic and are accurate to at least 10 significant figures for typical inputs. For very large or very precise calculations, scientific notation is used to avoid display errors.