A scientific calculator is essential for anyone working beyond basic arithmetic — students solving physics problems, engineers calculating circuit values, chemists converting moles, or data scientists running statistical tests. This free online scientific calculator provides every function you'd find on a TI-84 or Casio fx-991, right in your browser. No app downloads, no batteries, no cost — just precision mathematics at your fingertips.
## Available Functions The scientific calculator includes a complete set of mathematical functions organized into clear categories: **Trigonometry**: sin, cos, tan, and their inverses (asin, acos, atan). Switch between degree and radian mode depending on your problem. **Logarithms**: log (base 10) for engineering and chemistry, and ln (natural log, base e) for calculus and finance. **Powers & Roots**: x², x³, √x, ∛x, xʸ (any power), 10ˣ, eˣ. **Constants**: π (3.14159…) and e (2.71828…) — the two most important mathematical constants. **Utility**: 1/x (reciprocal), n! (factorial), % (percentage), and parentheses for controlling order of operations.
## Degrees vs. Radians The DEG/RAD toggle is critical for trigonometric calculations. **Degrees** are used in geometry, navigation, and everyday angle measurement (a right angle = 90°). **Radians** are the standard in calculus, physics, and engineering (a right angle = π/2 ≈ 1.5708 radians). Using the wrong mode is one of the most common errors in scientific calculations — always check before computing trig functions. Conversion: radians = degrees × (π/180). So 45° = 0.7854 rad, 180° = π rad, 360° = 2π rad.
## Common Scientific Calculations **Physics — Projectile Motion**: To find the horizontal distance of a projectile: d = (v² × sin(2θ)) / g. With v=20 m/s, θ=45°, g=9.81: d = (400 × sin(90°)) / 9.81 = 400/9.81 = 40.8 m. **Chemistry — pH Calculation**: pH = −log₁₀[H⁺]. For a solution with [H⁺] = 0.001 M: pH = −log(0.001) = 3. **Finance — Compound Interest**: A = P × e^(rt) for continuous compounding. $1,000 at 5% for 10 years: A = 1000 × e^(0.5) = 1000 × 1.6487 = $1,648.72. **Statistics — Standard Normal Distribution**: The probability density function uses e^(−x²/2), requiring both exponential and power functions.
This tool is most valuable when you need a result to compare against something else: a quoted figure, a competing option, or a budget threshold. Accurate comparisons require accurate inputs and arithmetic — this calculator ensures both.
Many errors with this type of calculation stem from unit inconsistency: mixing metric and imperial, or mixing annual and monthly rates. Ensure all inputs use the same unit system before running the calculation.
A business owner spots that revenue grew from £180,000 last year to £213,400 this year. The calculator confirms the increase is 18.6% — a figure needed for the annual report and for comparing against the industry growth rate cited in the sector report.
Core Scientific Functions
sin(θ) cos(θ) tan(θ) | log₁₀(x) ln(x) | x² √x xʸ | n!
θ in degrees or radians. log = base 10. ln = natural log (base e ≈ 2.71828). x^y = x raised to the power y. n! = n factorial.
Find the hypotenuse of a right triangle with legs a=5 and b=12 using the Pythagorean theorem.
Result: Hypotenuse = 13 — confirmed by the 5-12-13 Pythagorean triple
Sin, cos, tan, asin, acos, atan, x², √, x³, ∛, log (base 10), ln (natural log), 10^x, e^x, x^y, π, e, 1/x, n!, %, and memory functions (M+, M−, MR, MC).
Both. Use the DEG/RAD toggle to switch modes. Degrees are standard for geometry; radians for calculus and physics.
log(x) is the common logarithm (base 10), used in engineering, chemistry (pH), and decibel calculations. ln(x) is the natural logarithm (base e ≈ 2.71828), used in calculus, compound interest, and population growth models.
Yes. The scientific calculator is fully responsive and optimized for smartphones and tablets. All buttons are touch-friendly and the display adjusts to screen size.
The scientific calculator follows standard mathematical order of operations (PEMDAS/BODMAS): Parentheses first, then Exponents, then Multiplication/Division, then Addition/Subtraction.