What Is a Scientific Calculator?
A scientific calculator is an advanced calculator capable of performing complex mathematical operations far beyond basic addition, subtraction, multiplication, and division. It handles trigonometric functions (sin, cos, tan), logarithms, exponential functions, roots, powers, factorials, and scientific notation — making it an essential tool for students, engineers, scientists, and mathematicians.
Our free scientific calculator online provides all the functions of a physical scientific calculator — like the Casio FX-991 or Texas Instruments TI-30 — right in your browser, with no download or installation required. It works on any device, including phones and tablets.
Online scientific calculator — full functions for trigonometry, logarithms, powers, and more
How to Use a Scientific Calculator — Step by Step
Step 1: Choose DEG or RAD Mode
Before using any trigonometric function, always set the correct angle unit. DEG (Degrees) is used in everyday geometry and navigation — most problems state angles in degrees. RAD (Radians) is used in calculus, physics, and advanced mathematics where 2π = 360°. Most school exam problems use degrees.
Step 2: Enter Your Expression
You can enter expressions by clicking buttons or typing directly on your keyboard. The full expression is shown in the display as you type, so you can verify what you're computing before pressing =.
Examples of Typed Expressions
sin(30) → press sin, type 30, press ) then =
2^10 → type 2, press xʸ, type 10, press =
log(1000) → press log, type 1000, press ) then =
√(144) → press √, type 144, press ) then =
3! → type 3, press n!, press =
5.4 EXP 3 → type 5.4, press EXP, type 3, press =
Step 3: Use 2nd/Shift for Inverse Functions
Press the 2nd button to unlock the secondary functions printed above each key in orange. This gives you access to:
- sin⁻¹, cos⁻¹, tan⁻¹ — inverse trigonometric functions
- 10ˣ — raise 10 to a power (inverse of log)
- eˣ — raise e to a power (inverse of ln)
- x³ — cube a number (instead of x²)
- ∛x — cube root (instead of √)
How to Do Scientific Notation on a Calculator
Scientific notation is used to write very large or very small numbers. For example, 3.5 × 10⁶ (3.5 million) or 1.6 × 10⁻¹⁹ (Planck's constant).
To enter scientific notation using the EXP button:
- Type the coefficient: e.g. 6.022
- Press EXP (this means "× 10 to the power of")
- Type the exponent: e.g. 23
- Press = to evaluate
- Result: 6.022 × 10²³ (Avogadro's number)
Pro Tip: To enter negative exponents (for very small numbers like 1.6×10⁻¹⁹), press EXP then use ± to make the exponent negative: type 1.6 → EXP → 19 → ± → =
Trigonometry on a Scientific Calculator
Finding sin(30°)
Ensure DEG mode is selected. Press sin, enter 30, press ) then = → result: 0.5
Finding an Angle (Inverse Trig)
To find an angle when you know the ratio: Press 2nd, then sin⁻¹ (or asin), enter the value (e.g. 0.5), press ) then = → result: 30°
Common Trig Values (DEG mode)
sin(0°) = 0 cos(0°) = 1 tan(0°) = 0
sin(30°) = 0.5 cos(30°) = 0.866 tan(30°) = 0.577
sin(45°) = 0.707 cos(45°) = 0.707 tan(45°) = 1
sin(60°) = 0.866 cos(60°) = 0.5 tan(60°) = 1.732
sin(90°) = 1 cos(90°) = 0 tan(90°) = undefined
Scientific calculator for physics and engineering — handles trig, logs, exponents, and scientific notation
Keyboard Shortcuts — Type Faster
Our scientific calculator online fully supports keyboard input. Use these shortcuts to speed up your calculations:
- Numbers 0–9 — enter digits directly
- + − * / — basic operators (/ becomes ÷)
- Enter or = — calculate result
- Backspace — delete last character
- Escape — clear all (AC)
- s, c, t — sin, cos, tan
- l — log, n — ln
- p — insert π
- ^ — power (xʸ)
- ! — factorial
