How do I calculate sin, cos, or tan of an angle?

Make sure the calculator is in the correct mode (DEG for degrees, RAD for radians). Enter the angle value, then press the sin, cos, or tan button. For example, sin(30) in DEG mode returns 0.5.

What is the difference between log and ln?

log (common logarithm) uses base 10: log(100) = 2. ln (natural logarithm) uses base e ≈ 2.718: ln(e) = 1. In science and engineering, ln is more common. In everyday calculations like decibels or pH, log base 10 is used.

How do I enter negative exponents?

Use the (+/-) sign button to make the exponent negative, or enter the reciprocal. For example, 10^(-3) = 0.001. Some calculators use the EE or EXP button for scientific notation: 1 EE -3 = 1 × 10⁻³ = 0.001.

How do I calculate the square root of a number?

Press the √ button followed by the number, or enter the number and then press √. For example, √144 = 12.

What is the difference between DEG and RAD mode?

DEG (degrees) measures angles from 0 to 360 in a full circle. RAD (radians) measures from 0 to 2π. Most everyday problems use degrees. Radians are standard in calculus, physics, and programming math libraries. To convert: radians = degrees × π/180.

Scientific Calculator – Sin, Cos, Tan, Log & Exponents Online Free

A full-featured scientific calculator in your browser. Compute trigonometric functions (sin, cos, tan, arcsin, arccos, arctan), logarithms, square roots, exponents, and factorials. Supports both degree and radian mode — no app download needed.

DEG

Keyboard Shortcuts

0–9, .Numbers

+ − * /Operators

( )Parentheses

^Power

Enter / =Calculate

BackspaceDelete

EscClear all

Available Functions

sin / cos / tan— Trigonometric

sin⁻¹ / cos⁻¹ / tan⁻¹— Inverse trig

log— Base-10 logarithm

ln— Natural logarithm

√ / ∛— Square / cube root

x² / x³ / xʸ— Powers

10ˣ / eˣ— Exponentials

x!— Factorial

abs— Absolute value

π / e— Constants

Ans— Previous answer

M+ / M− / MR / MC— Memory

When to Use a Scientific Calculator

Trigonometry homework

Calculate sin, cos, and tan values for any angle in degrees or radians without switching between apps or looking up tables.

Engineering and physics problems

Compute logarithms, exponentials, roots, and combinations for technical calculations that go beyond a basic four-function calculator.

Exam preparation

Practice calculations using the same functions available on physical scientific calculators like the Casio fx-82 used in board exams.

How to Use the Scientific Calculator

Enter your expression

Type numbers and select functions like sin, cos, log, or sqrt from the function panel.

Select degree or radian mode

Toggle between DEG and RAD for trigonometric calculations.

Press equals

Calculate the result instantly.

Chain calculations

Use the Ans key to chain results into the next calculation.

Trigonometric Functions: Sin, Cos, Tan Explained

Trigonometric functions relate the angles of a right triangle to the ratios of its sides. Sin (sine) = opposite ÷ hypotenuse. Cos (cosine) = adjacent ÷ hypotenuse. Tan (tangent) = opposite ÷ adjacent, or equivalently sin ÷ cos. The most commonly used values: sin(0°) = 0, sin(30°) = 0.5, sin(45°) ≈ 0.707, sin(60°) ≈ 0.866, sin(90°) = 1. Cosine values are the reverse: cos(90°) = 0, cos(0°) = 1. The inverse functions — arcsin, arccos, arctan — take a ratio and return the angle. For example, arcsin(0.5) = 30°. In physics and engineering, these functions appear in wave analysis, force resolution, and circuit calculations. In board exams (JEE, NEET, CBSE), trigonometric values are tested from 0° to 360° including identities like sin²θ + cos²θ = 1. Use this calculator to verify calculations, not as a substitute for understanding the underlying concepts.

Logarithms: When to Use Log vs. Ln

A logarithm answers the question: "what power must the base be raised to in order to get this number?" log₁₀(1000) = 3 because 10³ = 1000. ln(e²) = 2 because e² = e². Log base 10 is used in real-world scales: pH = −log[H⁺], decibels = 10 × log(power ratio), Richter scale = log of amplitude. Natural log (ln) appears in continuous growth and decay formulas, finance (continuously compounded interest), and calculus derivatives. The change of base formula lets you calculate any base: log_b(x) = ln(x) ÷ ln(b) or log(x) ÷ log(b). For example, log₂(8) = ln(8) ÷ ln(2) ≈ 2.079 ÷ 0.693 = 3. The antilog of a common log is 10^x; the antilog of a natural log is e^x. On this calculator, 10^x and e^x perform these inverse operations.

Frequently Asked Questions

How do I calculate sin, cos, or tan of an angle?: Make sure the calculator is in the correct mode (DEG for degrees, RAD for radians). Enter the angle value, then press the sin, cos, or tan button. For example, sin(30) in DEG mode returns 0.5.
What is the difference between log and ln?: log (common logarithm) uses base 10: log(100) = 2. ln (natural logarithm) uses base e ≈ 2.718: ln(e) = 1. In science and engineering, ln is more common. In everyday calculations like decibels or pH, log base 10 is used.
How do I enter negative exponents?: Use the (+/-) sign button to make the exponent negative, or enter the reciprocal. For example, 10^(-3) = 0.001. Some calculators use the EE or EXP button for scientific notation: 1 EE -3 = 1 × 10⁻³ = 0.001.
How do I calculate the square root of a number?: Press the √ button followed by the number, or enter the number and then press √. For example, √144 = 12.
What is the difference between DEG and RAD mode?: DEG (degrees) measures angles from 0 to 360 in a full circle. RAD (radians) measures from 0 to 2π. Most everyday problems use degrees. Radians are standard in calculus, physics, and programming math libraries. To convert: radians = degrees × π/180.

Calculators