Scientific Calculator Online
A free full-featured scientific calculator. Trig, logs, powers, factorials, memory — no download or sign-up needed.
Scientific Notation Reference Table
Scientific notation expresses numbers as a coefficient times a power of 10. Use the EXP button on the calculator above to enter scientific notation values directly.
| Name | Standard | Scientific Notation |
|---|---|---|
| One thousand | 1,000 | 1 × 10³ |
| One million | 1,000,000 | 1 × 10⁶ |
| One billion | 1,000,000,000 | 1 × 10⁹ |
| One trillion | 1,000,000,000,000 | 1 × 10¹² |
| One thousandth | 0.001 | 1 × 10⁻³ |
| One millionth | 0.000001 | 1 × 10⁻⁶ |
| Speed of light (m/s) | 299,792,458 | 2.998 × 10⁸ |
| Avogadro’s number | 602,214,076,000,000,000,000,000 | 6.022 × 10²³ |
| Electron charge (C) | 0.000000000000000000160217663 | 1.602 × 10⁻¹⁹ |
How to Use the Scientific Calculator
The online scientific calculator works just like a physical scientific calculator. Understanding the key functions helps you get accurate results quickly.
Angle Mode: DEG, RAD, and GRAD
Before using trig functions, select the correct angle mode at the top of the calculator. DEG mode uses degrees (0 to 360 for a full circle). RAD mode uses radians (0 to 2π). GRAD mode uses gradians (0 to 400). For most school math and everyday use, DEG is the correct mode. For calculus and physics, RAD is standard.
Trigonometric Functions
Trigonometric functions sin, cos, and tan calculate ratios of sides in right triangles. Their inverse functions (sin⁻¹, cos⁻¹, tan⁻¹) find angles when you know the ratio. Always set the correct angle mode before computing trig values.
Logarithms and Exponents
- log computes the base-10 logarithm. Example: log(1000) = 3
- ln computes the natural logarithm (base e). Example: ln(e) = 1
- log₂ computes the base-2 logarithm. Example: log₂(8) = 3
- 10ˣ raises 10 to the power you entered. Example: 10ˣ where x=3 gives 1000
- eˣ raises Euler’s number e to your entered power.
- xʸ raises x to the power y. Enter x, press xʸ, enter y, then press =
Memory Functions
- MS (Memory Store): Saves the current display value to memory.
- MR (Memory Recall): Loads the stored memory value into the display.
- M+ (Memory Add): Adds the current display value to memory.
- M- (Memory Subtract): Subtracts the current display value from memory.
- MC (Memory Clear): Resets memory to zero.
Common Scientific Calculator Errors
Scientific calculator errors occur when the input is outside the valid range for a function. Common issues include computing log or ln of zero or a negative number (undefined), taking the square root of a negative number in real mode (undefined in real numbers), dividing by zero (undefined), and computing factorial of a non-integer or negative number. The calculator will display “Error” in these cases.
When to Use Scientific Notation
Scientific notation is useful when working with very large numbers (such as distances between stars) or very small numbers (such as atomic measurements). Use the EXP button to enter numbers like 3.0 × 10⁸ directly. The calculator displays results in scientific notation automatically when values exceed 12 significant digits.
Difference Between a Scientific and Basic Calculator
A basic calculator handles addition, subtraction, multiplication, and division. A scientific calculator adds trig functions, logarithms, exponential functions, memory, parentheses for order of operations, factorials, roots, and constants like π and e. Scientific calculators are required for most high school and college science and math courses.
Frequently Asked Questions
A scientific calculator is used to perform complex mathematical operations including trigonometry (sin, cos, tan), logarithms, exponents, square roots, factorials, and statistical calculations. It is commonly used in science, engineering, mathematics, and finance.
DEG (degrees) and RAD (radians) are two different units for measuring angles. In DEG mode, a full circle equals 360 degrees. In RAD mode, a full circle equals 2π radians (approximately 6.283). Always check which mode your calculation requires before using trig functions.
Press the ‘log’ button to calculate the base-10 logarithm, or ‘ln’ for the natural logarithm (base e). For example, log(100) = 2 because 10 squared equals 100, and ln(e) = 1 because e to the power of 1 equals e.
MC clears the memory, MR recalls the stored value into the display, MS saves the current display value to memory, M+ adds the current display value to whatever is already in memory, and M- subtracts the current value from memory.
The EXP button allows you to enter numbers in scientific notation. For example, pressing 3 then EXP then 8 enters 3 × 10⁸ (300,000,000). It is used for very large or very small numbers common in science and engineering.
Yes. This online scientific calculator is fully mobile responsive. It works on any smartphone, tablet, or desktop browser without any download, app, or sign-up required.