Online Calculators

Free online calculator for addition, subtraction, multiplication, division, and percentage. Simple, fast, and easy to use for everyday math calculations. Features keyboard support, calculation history, and zoom mode.

Advanced scientific calculator for trigonometry, logarithms, powers, roots, factorials, and more.

Easily calculate your exact age in years, months, and days with this simple online tool.

Calculate percentages, percentage change, and more with ease.

Practice multiplication tables, view multiplication chart, and test your skills with interactive practice mode and performance history.

Calculate sin(x) and arcsin(x) instantly with step-by-step solution in radians, degrees, and π fraction format. Interactive slider with common trigonometric values support.

Interactive unit circle explorer with special angles, exact trig values, and draggable point. Perfect for learning trigonometry and understanding sine, cosine, and tangent relationships.

Convert height between cm and feet/inches or estimate a child’s future adult height accurately.

Convert units of length, weight, volume, temperature, and speed instantly.

Calculate grades, percentages, and GPAs instantly with this free online final Grade Calculator.

Add, subtract, multiply, divide, and simplify fractions instantly.

Calculate percent error using experimental and theoretical values.

Perform binary arithmetic operations and convert between binary and decimal.

Convert and calculate hexadecimal values with ease.

Calculate radioactive decay and remaining quantity using half-life formulas.

Simplify ratios and compare relative values instantly.

Round numbers to any decimal place or nearest whole number.

Convert numbers to and from scientific notation easily.

Convert numbers between binary, octal, decimal, hexadecimal, and other custom bases from 2 to 36.

Convert between Roman numerals (I, V, X, L, C, D, M) and decimal numbers from 1 to 3,999.