Free Tool

Scientific Calculator

Trigonometry, logarithms, powers & more. Perfect for math, physics & chemistry.

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No signup required. Use for homework, exams & study sessions.

Free Online Scientific Calculator, Trig, Log, Exponents

A full scientific calculator with trigonometric functions (sin, cos, tan and inverses), logarithms (log, ln), exponents (x², xⁿ, eˣ), square root, factorial (n!), constants (π, e), and degree/radian modes. Works in any browser, no installs, no sign-up.

How to use it

  1. Enter the expression

    Type or click buttons to build your expression. Standard order of operations applies (parentheses first, then exponents, then multiplication/division, then addition/subtraction).

  2. Switch degree/radian for trig

    For sin/cos/tan, the calculator defaults to degrees. Click "Rad" to switch to radians (used in calculus and physics). Make sure you're in the right mode, sin(30°) ≠ sin(30 rad).

  3. Press equals

    Hit the = button or press Enter to evaluate. The result displays with up to 12 significant figures. Press it again to reuse the result in a new expression.

When you'd use this

Physics homework, trig and exponentials

Calculating velocity components, projectile motion, oscillations? You need sin, cos, tan plus the right unit (radians for calculus-based physics; degrees for engineering).

Chemistry, pH and pKa calculations

pH = -log[H⁺]. The log function and inverse log (10ˣ) handle pH, pKa, and equilibrium calculations on the fly.

Algebra II / Pre-calc

Logarithm rules, exponential growth/decay, factorial in combinations and permutations, all the buttons are here.

Statistics, combinations and permutations

C(n,r) = n!/(r!(n-r)!). Use the factorial (!) button to crunch combinations and permutations without installing a stats package.

Engineering, quick unit conversions

Pair this with our unit converter (linked below) for engineering: calculate the value here, convert units there.

Math course quick checks

Doing a problem set by hand? Use the calculator to verify each answer. Faster than firing up Wolfram Alpha for routine arithmetic.

Common mistakes to avoid

Wrong angle mode

sin(30) returns 0.5 in degrees but -0.988 in radians. Always check the Deg/Rad indicator before computing trig functions.

Order of operations confusion

2 + 3 × 4 = 14, not 20. Parentheses → exponents → multiply/divide → add/subtract (PEMDAS). The calculator handles it correctly; verify your input matches your intent.

Mixing log and ln

log = base 10. ln = base e. log(100) = 2; ln(100) ≈ 4.6. Wrong button = wrong answer in chemistry pH calculations.

Forgetting the parenthesis on exponents

2^1/2 = 0.5 (because the calculator reads it as 2^1 then ÷2). For square root via exponent, type 2^(1/2) = 1.414.

Trusting precision past the input

If you measured a length to 3 significant figures, your calculator answer to 12 decimals is false precision. Round results to match your input precision.

Examples

Quadratic formula
Before
Solve x² + 5x + 6 = 0
After
x = (-5 ± √(25 - 24)) / 2 = (-5 ± 1) / 2 → x = -2 or x = -3

Use the calculator step-by-step: compute discriminant (b² - 4ac), take square root, plug into (-b ± √disc) / 2a.

pH from concentration
Before
[H⁺] = 1.5 × 10⁻⁴ M
After
pH = -log(1.5e-4) = 3.82

pH uses base-10 log. Type your concentration, hit log button, negate the result.

Compound interest
Before
$1000 at 5% APR for 10 years, compounded monthly
After
A = 1000 × (1 + 0.05/12)^(12×10) = $1,647.01

Use parentheses to enforce order: A = P × (1 + r/n)^(n×t). Calculator handles the exponent on a parenthesized expression.

Glossary

Trigonometry
Branch of math dealing with angles. Sin, cos, tan and inverses are the core functions.
Logarithm
Inverse of an exponential. log₁₀(1000) = 3 because 10³ = 1000. ln is base e.
Radian
Angle unit where π radians = 180°. Used in calculus and physics. 1 rad ≈ 57.3°.
Factorial
n! = n × (n-1) × ... × 1. 5! = 120. Used in combinations, permutations, and Taylor series.
Exponent
Power to which a base is raised. 2³ = 8 (2 to the power 3). Calculator uses ^ or x^y button.
Order of operations (PEMDAS)
Parentheses, Exponents, Multiplication/Division, Addition/Subtraction. Standard rule for evaluating expressions.
Significant figures
Digits that carry meaningful precision. Round results to match the precision of your inputs.

Frequently asked questions

Yes, completely free, no sign-up, runs in your browser.

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