Scientific Calculator Online 2026
A full-featured scientific calculator for students, engineers, and professionals. Compute trigonometry (sin, cos, tan), logarithms (log, ln), powers, roots, factorials, percentages, and more — with memory functions, DEG/RAD mode, inverse functions, and a full calculation history.
How to Use a Scientific Calculator
A scientific calculator extends the basic four operations (add, subtract, multiply, divide) with advanced mathematical functions. It is essential for high school and university mathematics, physics, chemistry, engineering, and statistics. Unlike a basic calculator, a scientific calculator handles trigonometry, exponents, roots, and logarithms natively.
DEG vs. RAD — Which Should You Use?
The DEG/RAD toggle controls how angles are interpreted in trigonometric functions. Use DEG (Degrees) for geometry, navigation, and everyday problems — a right angle is 90°, a straight line is 180°, a full circle is 360°. Use RAD (Radians) for calculus, physics, and engineering — a right angle is π/2 ≈ 1.5708 rad, a full circle is 2π ≈ 6.2832 rad. Forgetting to switch modes is one of the most common errors — if sin(90) gives you 0.894 instead of 1, you are in RAD mode when you need DEG.
INV (Inverse) Mode
Press the INV button (highlighted in amber when active) to switch function buttons to their inverse. This gives you: sin⁻¹ (arcsin), cos⁻¹ (arccos), tan⁻¹ (arctan), sinh⁻¹, cosh⁻¹, tanh⁻¹, 10ˣ (inverse of log), and eˣ (inverse of ln). The orange labels on the buttons show what each key does in INV mode. Press INV again to return to normal.
Order of Operations (BODMAS / PEMDAS)
This calculator respects standard mathematical order of operations: Brackets → Orders (powers, roots) → Division/Multiplication → Addition/Subtraction. Use the ( ) parenthesis buttons to control grouping in complex expressions. For example, to compute (3 + 5) × 2, type: ( → 3 → + → 5 → ) → × → 2 → =.
Memory Functions Explained
The five memory keys work like a clipboard for numbers. MS stores the current number. MR recalls it. MC clears it. M+ adds the current number to the memory value (useful for running totals). M− subtracts the current number from memory. When memory holds a value, the M indicator appears on the display in cyan.
Frequently Asked Questions
This calculator supports trigonometric functions (sin, cos, tan and their inverses), hyperbolic functions (sinh, cosh, tanh and inverses), logarithms (log base 10 and ln), powers (x², x³, xʸ, 10ˣ, eˣ), roots (√, ∛), factorials (n!), percentage, reciprocal (1/x), absolute value (|x|), constants π and e, five memory functions, parentheses for grouping, and a full calculation history.
DEG and RAD are two units for measuring angles. In DEG mode, a right angle is 90° and a full circle is 360°. In RAD mode, a right angle is π/2 (≈1.5708) and a full circle is 2π (≈6.2832). Use DEG for everyday geometry and navigation; use RAD for calculus, physics, and most engineering formulas. A common mistake is computing sin(90) in RAD mode — it gives ≈0.894 instead of exactly 1.
Select the correct angle mode (DEG or RAD), enter the angle value, then press the trig button. Example: for sin(45°) in DEG mode, type 45 then press sin → result is ≈0.7071. For inverse functions (find the angle from a ratio), press INV first, then press sin/cos/tan. Example: sin⁻¹(0.5) in DEG mode gives 30°.
MS (Memory Store) saves the current displayed value. MR (Memory Recall) brings that value back. MC (Memory Clear) erases the stored value. M+ adds the current value to what is already in memory — useful for accumulating a running total. M− subtracts from memory. A cyan "M" indicator on the display shows when memory holds a value.
A factorial (n!) multiplies all positive integers from 1 to n. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. Factorials are used in permutations, combinations, and probability. To calculate, enter the number and press n!. Note: factorials grow extremely fast — 20! ≈ 2.4 × 10¹⁸. This calculator handles up to 170! before returning Infinity.
Press log for base-10 logarithm (e.g. log(1000) = 3) or ln for natural logarithm, base e (e.g. ln(e) = 1). Enter the number first, then press the button. For any other base, use the formula log_a(x) = ln(x) ÷ ln(a) — compute each part with this calculator. In INV mode, log becomes 10ˣ and ln becomes eˣ.
Yes. Use the ( and ) buttons to group parts of your expression and control order of operations. For example, to calculate (8 + 2) × (5 − 3), type: ( 8 + 2 ) × ( 5 − 3 ) =, which gives 20. Without parentheses, 8 + 2 × 5 − 3 would be evaluated as 8 + (2×5) − 3 = 15 per standard BODMAS rules.