When should I use DEG versus RAD mode?

Use DEG for degree-based problems and everyday work. Use RAD for calculus, physics, and programming where radians are standard.

What is the difference between log and ln?

log is base 10 logarithm. ln is the natural logarithm base e, used in calculus and physics.

How do I calculate factorial?

Type the number then press n!. Maximum supported value is 170.

Can I reuse a previous result?

Yes. Click any entry in the history panel to load it back into the input.

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Scientific Calculator Online Free

A full scientific calculator in your browser. Trig functions, logarithms, exponents, factorials, constants, angle mode toggle, and a history log. Works on any device instantly.

✔ sin, cos, tan, their inverses ✔ log, ln, exp ✔ DEG and RAD modes ✔ Calculation history ✔ Keyboard support

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About This Tool

Why Use a Scientific Calculator Online Free

A basic calculator handles arithmetic. But physics, engineering, statistics, and advanced math problems need trig functions, logarithms, exponents, and factorial operations that a basic four-function calculator cannot provide.

This scientific calculator online free puts all those functions in your browser with no install and no app download needed. Switch between degree and radian mode, recall previous results from history, and use your keyboard for fast input.

Every calculation stays on your device. Nothing is sent to a server.

What this calculator does

sin, cos, tan and their inverses asin, acos, atan

log base 10, natural log ln, and exp function

Power operator, square root, absolute value

Factorial for integers up to 170

Constants pi and e built in

DEG and RAD angle mode toggle

Full calculation history with recall

Keyboard input for fast use

Function reference

sin(x)

Sine of x. Respects current angle mode (DEG or RAD).

cos(x)

Cosine of x. Respects current angle mode.

tan(x)

Tangent of x. Undefined at 90, 270 degrees.

asin(x)

Inverse sine. Returns angle in current mode.

log(x)

Logarithm base 10.

ln(x)

Natural logarithm base e.

sqrt(x)

Square root of x.

n!

Factorial of n. Works for non-negative integers.

x^y

x raised to the power of y.

abs(x)

Absolute value of x.

exp(x)

e raised to the power of x.

mod

Modulo remainder. Example: 10 mod 3 = 1.

How to use this calculator

1

Choose angle mode

Select DEG for degrees or RAD for radians before using trig functions.

2

Enter your expression

Click buttons or type on your keyboard. Combine functions and operators freely.

3

Press equals

Hit the = button or press Enter. The result appears on the display.

4

Use history

Click any previous result in the history panel to recall it into the input.

Common Questions

FAQ: Scientific Calculator Online Free

Yes, completely free. No account, no signup, and no payment required at any point.

Use DEG when your angles are in degrees, which is the default for most everyday problems and most high school level work. Use RAD when working in radians, which is standard in calculus, physics, and most programming environments. The mode affects all trig functions and their inverses.

Yes. Numbers, operators, parentheses, Enter for equals, Backspace to delete, and Escape to clear all work from your keyboard. This makes the calculator much faster for long calculations.

log is the logarithm base 10, also written log10. It asks how many times you need to multiply 10 by itself to get x. ln is the natural logarithm, base e. It uses the constant e (approximately 2.718) instead of 10 and appears frequently in calculus, physics, and finance.

Type the number then press the n! button. For example, type 5 then n! to get 120. Factorial is only defined for non-negative integers. The maximum supported value is 170 since 171! exceeds the maximum floating point number.

Yes. Click any entry in the history panel on the right to load that result back into the input. From there you can continue building a new expression with it.