How do I switch between degrees and radians?

Press the DEG/RAD key at the top-left of the keypad. The current mode is shown on the display. In DEG mode, sin(90) = 1; in RAD mode, sin(π/2) = 1.

How do I calculate powers and roots?

Use x² for squares, ^ for any power (2^10 = 1024), √ for square roots, and ⁿ√ for other roots — it types root( and takes two inputs: root(3, 27) is the cube root of 27, which equals 3.

ANS inserts the result of your previous calculation, so you can chain steps: after 6 × 7 = 42, pressing ANS + 1 = gives 43.

How do I use the inverse trig functions?

sin⁻¹, cos⁻¹ and tan⁻¹ compute the angle whose sine, cosine or tangent you enter. The answer comes back in the current angle mode — sin⁻¹(1) is 90 in DEG mode and π/2 ≈ 1.5708 in RAD mode.

What is the difference between log and ln?

log is the base-10 logarithm (log(1000) = 3) and ln is the natural logarithm, base e ≈ 2.71828 (ln(e) = 1). Both are defined for positive numbers only.

Can I type calculations with my keyboard?

Yes — digits, the + - * / ^ % ( ) keys, Enter for equals, Escape to clear, and Backspace to delete all work exactly like the on-screen keys.

How large a factorial can it compute?

Up to 170! — beyond that the result exceeds what standard floating-point numbers can represent, and the calculator reports an error instead of showing an inaccurate value.

Math

Scientific Calculator

Free online scientific calculator with trig in degrees or radians, logarithms, powers, roots, factorial, memory, ANS and history. Full keyboard support.

DEG

How to use the Scientific Calculator

Enter your valueType the number you want to work with into the Scientific Calculator input field.
Choose your units or optionsSelect the units or options that match your figure. Calculy handles the conversion or formula for you.
Read the resultThe result updates instantly — there is no button to press and no sign-up required.

What is this scientific calculator?

A free online scientific calculator covering the functions of a classic Casio-style pocket calculator: trigonometry with a DEG/RAD switch, base-10 and natural logarithms, powers and roots, factorial, the constants π and e, parentheses, percentages, a memory register and an ANS key that recalls your previous result. Every calculation is kept in a history tape you can click to reuse.

Functions and how to enter them

Trigonometry — sin, cos, tan and their inverses. Check the DEG/RAD indicator first: sin(90) = 1 in degrees, sin(π/2) = 1 in radians.
Powers and roots — x² squares, ^ raises to any power (2^10 = 1024), √ takes a square root, and ⁿ√ enters root(n, x): root(3, 27) = 3.
Logarithms — log is base 10, ln is base e; 10ˣ and eˣ are their inverses.
Factorial — the x! key: 5! = 120, up to 170!.
ANS — inserts the previous result: after 6 × 7 = 42, ANS + 1 = 43.

Keyboard shortcuts

Key	Action
0–9 . ( )	digits, decimal point, parentheses
+ - * / ^ % !	operators
Enter	equals
Escape	clear entry
Backspace	delete last input

Limitations

Double-precision arithmetic — about 15 significant digits; results outside ±10¹² display in scientific notation.
Undefined operations (division by zero, log of a non-positive number, tan 90° in DEG) show a clear error message.
Hyperbolic functions, fractions display and base-n modes are not included in this version.

FAQs

How do I switch between degrees and radians?: Press the DEG/RAD key at the top-left of the keypad. The current mode is shown on the display. In DEG mode, sin(90) = 1; in RAD mode, sin(π/2) = 1.
How do I calculate powers and roots?: Use x² for squares, ^ for any power (2^10 = 1024), √ for square roots, and ⁿ√ for other roots — it types root( and takes two inputs: root(3, 27) is the cube root of 27, which equals 3.
What is the ANS key?: ANS inserts the result of your previous calculation, so you can chain steps: after 6 × 7 = 42, pressing ANS + 1 = gives 43.
How do I use the inverse trig functions?: sin⁻¹, cos⁻¹ and tan⁻¹ compute the angle whose sine, cosine or tangent you enter. The answer comes back in the current angle mode — sin⁻¹(1) is 90 in DEG mode and π/2 ≈ 1.5708 in RAD mode.
What is the difference between log and ln?: log is the base-10 logarithm (log(1000) = 3) and ln is the natural logarithm, base e ≈ 2.71828 (ln(e) = 1). Both are defined for positive numbers only.
Can I type calculations with my keyboard?: Yes — digits, the + - * / ^ % ( ) keys, Enter for equals, Escape to clear, and Backspace to delete all work exactly like the on-screen keys.
How large a factorial can it compute?: Up to 170! — beyond that the result exceeds what standard floating-point numbers can represent, and the calculator reports an error instead of showing an inaccurate value.

Math →