How to use the scientific calculator
Type an expression or use the keypad, then press = or the Enter key. Parentheses control calculation order. Choose DEG for degree angles and RAD for radians. Previous results appear in History and can be restored by tapping them.
DEG and RAD for SEE and NEB mathematics
The most common scientific-calculator mistake is using the wrong angle mode. In degree mode, sin(30) = 0.5. In radian mode, the same input means 30 radians and gives a different answer. When a question uses the degree symbol, use DEG. When it uses π or explicitly says radians, use RAD.
| Expression | Mode | Result |
|---|---|---|
| sin(30) | DEG | 0.5 |
| cos(π) | RAD | −1 |
| tan(45) | DEG | 1 |
| asin(0.5) | DEG | 30 |
Logarithms, powers and scientific notation
The log key means base-10 logarithm, while ln means natural logarithm with base e. Use 2e6 to write 2 × 10⁶, and the power operator for expressions such as 3^4. Very small or large results are displayed using scientific notation.
Factorial, permutation and combination
Factorial multiplies all positive integers down to one: 5! = 120. Use nPr when arrangement order matters and nCr when selecting a group without order. The inputs must be whole non-negative numbers, and r cannot be larger than n.
Accuracy, security and limitations
The calculator runs entirely in your browser using the restricted, number-only expression engine from mathjs. It does not use JavaScript eval. Assignments, custom functions, matrices, units and unknown symbols are blocked. Results use standard floating-point scientific precision and are formatted to remove common display noise, but no finite calculator can represent every irrational number exactly.
Domain errors such as √−1 in real-number mode, division by zero or tan(90°) return a clear math error. Use a dedicated complex-number or graphing tool when the problem requires those capabilities.
Frequently asked questions
Should I use DEG or RAD mode?
Use DEG when an angle is written in degrees, such as sin(30°). Use RAD when the angle is written using radians or π, such as cos(π). SEE and NEB questions may use either, so check the question carefully.
How do I calculate nCr and nPr?
Use nCr(n,r) for combinations where order does not matter, and nPr(n,r) for permutations where order matters. For example, nCr(10,3) = 120 and nPr(10,3) = 720.
How does percentage work?
The percent sign divides the preceding value by 100. For example, 200 × 10% gives 20. For percentage increase, enter 200 × (1 + 10%).
Does this calculator support complex numbers or matrices?
No. This calculator intentionally returns real-number scientific results. Complex numbers, matrices, equation solving and graphing need different interfaces and are better provided as separate tools.
Can I use this scientific calculator in an exam?
That depends on the examination rules. Online calculators and phones are usually restricted in supervised exams. Use this tool for practice and homework unless the responsible institution explicitly permits it.