This free online scientific calculator supports all standard scientific and mathematical operations including trigonometric functions, logarithms, exponents, factorials, and more. It works on desktop, tablet, and mobile.
| 0–9, ., +, -, *, / | Enter numbers and operators |
| Enter / = | Calculate result |
| Escape | Clear all (AC) |
| Backspace | Delete last character |
| ( and ) | Parentheses |
| % | Percentage / Modulo |
| ^ | Power (x to the y) |
log = base-10 logarithm, ln = natural logarithmx² for squaring, x³ for cubing, xʸ for arbitrary power (press after first number, enter exponent, then =)√ = square root of the current entryThis calculator follows PEMDAS/BODMAS: Parentheses, Exponents, Multiplication and Division (left to right), Addition and Subtraction (left to right). So entering 2 + 3 × 4 correctly evaluates to 14, not 20. Use parentheses to override the default order: (2 + 3) × 4 = 20.
Essential values in degree mode: sin(0°) = 0, sin(30°) = 0.5, sin(45°) = 0.707, sin(60°) = 0.866, sin(90°) = 1. cos(0°) = 1, cos(30°) = 0.866, cos(60°) = 0.5, cos(90°) = 0. tan(0°) = 0, tan(30°) = 0.577, tan(45°) = 1, tan(60°) = 1.732. These values appear constantly in physics, engineering, and geometry problems.
Use DEG mode for everyday problems: construction angles, navigation, surveying, and most high school/college physics. Use RAD mode for calculus, signal processing, and advanced physics — in these fields, angles in radians simplify the math significantly (the derivative of sin(x) is cos(x) only when x is in radians). If you get strange results from trig functions, check your mode first.
This free scientific calculator online handles everything from basic arithmetic to advanced math functions including trigonometry (sin, cos, tan), logarithms, exponents, square roots, and factorials. As a full-featured math calculator online, it is designed for students, engineers, and anyone needing more than a simple calculator.
The advanced calculator uses standard order of operations and supports both degree and radian modes for trigonometric functions. Whether you need a math calculator online for homework, exams, or professional work, this tool delivers accurate results instantly on any device.
These trigonometric functions relate angles to side ratios in right triangles. sin(θ) = opposite ÷ hypotenuse; cos(θ) = adjacent ÷ hypotenuse; tan(θ) = opposite ÷ adjacent = sin ÷ cos. Key values: sin(30°) = 0.5, cos(60°) = 0.5, tan(45°) = 1. Remember: SOH-CAH-TOA.
log calculates the base-10 logarithm: the power to which 10 must be raised to equal the input. log(100) = 2 because 10² = 100; log(1000) = 3. ln calculates the natural logarithm (base e). log is used in pH calculations (pH = −log[H⁺]), decibels (10×log of power ratio), and the Richter earthquake scale.
Degrees divide a circle into 360 equal parts. Radians measure angle as arc length ÷ radius — a full circle = 2π ≈ 6.283 radians. Key conversions: 180° = π rad; 90° = π/2 rad; 45° = π/4 rad. Use DEG for everyday problems; use RAD for calculus and physics (where the derivative of sin(x) = cos(x) only holds in radians).
A factorial (n!) is the product of all positive integers from 1 to n. 5! = 5×4×3×2×1 = 120. By definition, 0! = 1. Factorials grow explosively: 10! = 3,628,800; 20! ≈ 2.4 × 10¹⁸. They appear in combinations (C(n,r) = n! ÷ (r! × (n−r)!)) and probability calculations.
Press the xʸ button (or ^ on keyboard): enter the base, press xʸ, enter the exponent, press =. Example: 2 xʸ 10 = 1,024. Dedicated buttons: x² squares the number (shortcut), x³ cubes it. Negative exponents: 2^−3 = 1/8 = 0.125. Fractional exponents: 8^(1/3) = 2 (cube root of 8).
Euler's number e ≈ 2.71828 is the base of the natural logarithm and one of the most important constants in mathematics. It arises naturally in continuous growth: bank interest compounded continuously uses A = Pe^(rt). It appears throughout calculus, probability theory (normal distribution), and complex number analysis.
INV (Inverse) or 2nd toggles a second layer of functions on the same buttons. It unlocks: sin⁻¹ (arcsin — finds the angle from a ratio), cos⁻¹, tan⁻¹, 10^x (inverse of log), e^x (inverse of ln). Use arcsin/cos/tan when you know a side ratio and need to find the angle: if sin(θ) = 0.5, then θ = sin⁻¹(0.5) = 30°.
A basic calculator handles + − × ÷ only. A scientific calculator adds trig functions, logarithms, exponents, roots, factorials, constants (π, e, φ), and supports degree/radian switching. Critically, scientific calculators follow strict order of operations (PEMDAS), while simple left-to-right calculators give wrong answers for expressions like 2+3×4.