Metrics Calculator

Math Calculators

Percentage calculators, fraction and decimal converters, angle converters, basic calculator, random number generator, and more math tools for everyday calculations.

These tools cover the math problems that come up most often: percentages, fractions, decimals, and angle conversions. Pick a calculator below, enter your numbers, and the result includes the formula so you can verify it yourself.

12 calculators available

Which math calculator do you need?

The percentage calculator handles seven problem types, from finding a percent of a number to calculating percentage change and percentage difference. If you need to convert between formats, the fraction, decimal, and percent converters go both directions. For example, 0.375 converts to 3/8, and 3/8 converts back to 0.375.

The angle converters translate between degrees, radians, and gradians. A full circle is 360 degrees, 2π radians, or 400 gradians. These come up in trigonometry, engineering, and surveying. The basic calculator handles addition, subtraction, multiplication, and division with step-by-step breakdowns.

Common questions about math calculations

How do I convert a fraction to a percentage?

Divide the numerator by the denominator, then multiply by 100. For example, 3/4 = 0.75 x 100 = 75%. You can also use the fraction to decimal converter and then the decimal to percent converter.

What is the difference between percentage change and percentage difference?

Percentage change measures how much a value increased or decreased relative to the original (it has a direction: up or down). Percentage difference compares two values symmetrically, without treating either as the starting point. Use change for before/after comparisons and difference for side-by-side comparisons.

When would I use radians instead of degrees?

Radians are the standard in calculus, physics, and most programming languages. Degrees are more common in everyday use, navigation, and construction. If a formula uses π (like the area of a circle), radians will keep the math cleaner. Most scientific calculators and spreadsheet functions expect radians by default.