Scientific Calculator
Free online scientific calculator with sin, cos, tan, log, square root, and more. Supports degrees and radians.
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The scientific calculator provides full arithmetic and scientific function capabilities in your browser — no app download or physical calculator required. Supports the four basic operations, brackets for order of operations, trig functions (sin, cos, tan) in both degrees and radians, square root, powers, logarithms (log base 10 and natural log), and mathematical constants π and e. Students use it for maths and physics homework, engineers use it for quick field calculations, and developers use it to verify formula results. The history panel shows your last five calculations, making it easy to trace back through a multi-step problem. The DEG/RAD toggle controls how trigonometric inputs are interpreted. Most school-level maths and everyday calculations use degrees. Scientific and engineering contexts, especially anything involving calculus, typically use radians. The default is degrees.
How to Use the Scientific Calculator
The Scientific Calculator is designed to give you an accurate answer in seconds. Follow these steps:
- 1Toggle between DEG (degrees) and RAD (radians) for trigonometric functions
- 2Use the button keypad to enter numbers and operations
- 3Functions like sin, cos, tan, log, and ln are in the top two rows
- 4Press = to evaluate the expression
- 5Recent calculations are saved in the history panel below
No account or sign-up required. All calculations run locally in your browser — nothing is stored or transmitted to any server.
How It Works
The calculator evaluates expressions using standard mathematical order of operations (BODMAS/PEMDAS): brackets first, then exponents, then multiplication and division left to right, then addition and subtraction left to right. Scientific function buttons (sin, cos, tan, √, x², log, ln) insert the appropriate expression into the current input. For example, clicking sin then entering 30 and = evaluates sin(30°) = 0.5 in degree mode. The π button inserts 3.14159265358979... and e inserts 2.71828182845905... — both at full floating-point precision. Clear (C) resets the calculator entirely. The backspace (⌫) button removes the last character. History shows the last 5 complete calculations with their results.
Frequently Asked Questions
What is the difference between DEG and RAD mode?
DEG (degrees) and RAD (radians) are two ways to measure angles. A full circle is 360° or 2π radians. In degree mode, sin(90) = 1 because 90° is a right angle. In radian mode, sin(π/2) = 1 for the same reason. Most school-level calculations use degrees. Calculus, physics formulas, and programming languages like JavaScript and Python default to radians. Always check which mode you are in before computing trig values.
What does log mean on a calculator?
On a scientific calculator, "log" is the common logarithm — logarithm base 10. log(100) = 2 because 10² = 100. log(1000) = 3. "ln" is the natural logarithm — logarithm base e (Euler's number ≈ 2.71828). ln(e) = 1, ln(e²) = 2. Log base 10 appears in pH calculations, decibel scales, and Richter scale magnitude. Natural log appears in calculus, compound growth, and information theory.
How do I calculate sin, cos, or tan of an angle?
Make sure you are in the correct mode (DEG for degrees, RAD for radians). Click the sin, cos, or tan button, then enter the angle, then press =. Example: sin(30) in DEG mode = 0.5. cos(60) in DEG mode = 0.5. tan(45) in DEG mode = 1. For inverse trig functions, most scientific work requires using the inverse (sin⁻¹ or arcsin) — this calculator supports the forward functions.
What is the order of operations (BODMAS)?
BODMAS stands for Brackets, Orders (powers/roots), Division, Multiplication, Addition, Subtraction — the sequence in which operations are evaluated. 2 + 3 × 4 = 14, not 20, because multiplication is evaluated before addition. Use brackets to override order: (2 + 3) × 4 = 20. The American equivalent is PEMDAS: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction. Both describe the same rule.
Is the scientific calculator free?
Yes — completely free with no sign-up needed. Supports all standard scientific operations including trig functions, logarithms, powers, and constants. Works in both degrees and radians. All calculations run in your browser and no data is stored.