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Free online scientific calculator with trigonometry, logarithms, exponents, factorials, memory, and constants. Supports DEG and RAD modes.
A scientific calculator is a computing tool that performs trigonometric, logarithmic, exponential, and factorial functions in addition to basic arithmetic, used widely in science, engineering, and mathematics.
| Constant | Symbol | Value |
|---|---|---|
| Pi | π | 3.14159265 |
| Euler's Number | e | 2.71828183 |
| Golden Ratio | φ | 1.61803399 |
| Speed of Light | c | 2.998 × 10⁸ m/s |
| Avogadro's Number | Nₐ | 6.022 × 10²³ |
| Planck's Constant | h | 6.626 × 10⁻³⁴ J·s |
Formula
sin²(θ) + cos²(θ) = 1 (Pythagorean Identity)θ = The angle in degrees or radians
sin(θ) = Sine of angle θ — opposite / hypotenuse
cos(θ) = Cosine of angle θ — adjacent / hypotenuse
Worked Example
Calculate sin(30°) + cos(60°)
Did you know? The first electronic scientific calculator, the HP-35, was introduced by Hewlett-Packard in 1972 and made the slide rule obsolete (source: Computer History Museum).
Sources
Convert between degrees, radians, gradians, turns, and arc units for math and science.
Balance chemical equations by finding the correct coefficients for reactants and products.
Calculate radius, diameter, circumference, area, arc length, and sector area from any input.
Convert between kg/m³, g/cm³, lb/ft³, and more. Includes material density reference.
Differentiate polynomial functions with step-by-step power rule application.
Solve C₁V₁ = C₂V₂ for any missing variable in solution dilution problems.