Scientific Calculator

What Is a Scientific Calculator?

A scientific calculator handles complex mathematical functions beyond basic arithmetic. This free online version covers trigonometry, logarithms, exponents, factorials, and mathematical constants — everything needed for GCSE, A-Level, and university-level calculations.

Switch between DEG (degrees) and RAD (radians) for trigonometric functions. Most school and exam calculations use degrees. Physics and higher mathematics typically use radians. The mode indicator at the top shows which is active.

All results are calculated using JavaScript's native Math library, which matches the IEEE 754 double-precision standard used by most scientific calculators and spreadsheet software.

How Do You Use This Scientific Calculator?

Enter a number using the digit buttons or type it directly. Press a function button (sin, cos, log, etc.) to apply it to the current number. Use the operator buttons (+, −, ×, ÷, xⁿ) to chain calculations. Press = to see the result. Toggle between DEG and RAD for trigonometric functions.

1. Select DEG or RAD mode for trigonometric calculations (DEG is the default).
2. Enter your number using the digit buttons.
3. Press a scientific function (sin, cos, log, etc.) to calculate instantly.
4. For binary operations (×, ÷, +, −, xⁿ), enter the first number, press the operator, enter the second number, then press =.
5. Press AC to clear all and start a new calculation.
6. Press ⌫ to delete the last digit entered.

How Does the Scientific Calculator Formula Work?

The formula used: Supports: sin(x), cos(x), tan(x), log(x), ln(x), √x, xⁿ, n!, π, e, and all standard arithmetic operations.

What Are Some Example Calculations?

sin(30°) in DEG mode: enter 30, press sin → result is 0.5. log(1000): enter 1000, press log → result is 3. 2 raised to the power 8: enter 2, press xⁿ, enter 8, press = → result is 256.

When Should You Use a Scientific Calculator?

Use this calculator for GCSE and A-Level maths, physics, and chemistry problems that require trigonometry or logarithms. It covers all functions tested in UK school examinations.

Use it for engineering calculations involving angles, wave functions, or exponential decay. Switch to RAD mode when working with radians in calculus or physics equations.

What Do These Terms Mean?

How Do the Options Compare?

What Are the Best Tips to Know?

• Always check your angle mode (DEG vs RAD) before doing trig calculations — wrong mode is the most common error.
• Use ln for natural log problems in calculus, and log for base-10 problems in chemistry (pH calculations, etc.).
• For powers of 10, use the 10ˣ button rather than manually typing 10 and using xⁿ.
• The ± button negates the displayed value — useful for entering negative numbers quickly.
• Use % to convert percentages: pressing % on 25 gives 0.25.

What Mistakes Should You Avoid?

• Using DEG mode when the problem requires RAD (or vice versa) — check the mode indicator first.
• Applying a function before entering the number — always enter the number first, then press the function.
• Expecting sin(90) to equal exactly 1 in floating-point — the result may show 0.9999999999 due to rounding.
• Entering a negative number inside a function by typing a minus sign — use the ± button instead.