Full scientific calculator with trig, logs, powers and memory.
This free scientific calculator handles everything a school or college calculator does: trigonometry and inverse trig, natural and base-10 logs, powers and roots, factorials, π and e, and numbers in scientific notation. You can tap the keys or type straight into the display, see the answer as you type, and click any of your last 10 answers to reuse it.
Quick answer: type an expression such as sin(30), log(1000) or 2^10 and press Enter. Check the DEG/RAD button before trig questions: most school work uses degrees.
How to Use the Scientific Calculator
- Type or tap an expression, such as 2^10 or sin(30). The answer previews as you type.
- Press = or Enter to calculate. Press Esc or AC to clear.
- DEG / RAD: switches the angle mode for sin, cos and tan. The button shows the current mode.
- Ans: reuses your last answer. After pressing =, start with an operator such as × to carry on from the answer.
- History: your last 10 calculations appear below the keypad. Click one to load it again.
What Each Key Does
| Key | What it does | Example |
|---|---|---|
| x², xʸ | Square, or any power | 2^10 = 1,024 |
| √ | Square root | √(3^2+4^2) = 5 |
| sin, cos, tan | Trigonometry | sin(30) = 0.5 in DEG mode |
| sin⁻¹, cos⁻¹, tan⁻¹ | Inverse trig, giving an angle | sin⁻¹(0.5) = 30 in DEG mode |
| log | Logarithm to base 10 | log(1000) = 3 |
| ln | Natural logarithm, base e | ln(e) = 1 |
| eˣ, 10ˣ | Powers of e and 10 | 10^(3) = 1,000 |
| n! | Factorial | 5! = 120 |
| % | Divides by 100 | 200 × 15% = 30 |
| 1/x | Reciprocal | 1/(4) = 0.25 |
| EXP | Scientific notation | 6.02E23 |
| π, e | Constants | 2π ≈ 6.2832 |
Useful Calculations to Try
| Task | Type this | Answer |
|---|---|---|
| Area of a circle with radius 5 | π*5^2 | 78.5398… |
| Hypotenuse of a 3-4-5 triangle | √(3^2+4^2) | 5 |
| $1,000 at 5% interest for 3 years | 1000*(1+0.05)^3 | 1,157.625 |
| pH of a 0.001 M acid | −log(0.001) | 3 |
| Ways to arrange 5 books | 5! | 120 |
Order of Operations
The calculator follows the standard order (PEMDAS or BODMAS): brackets, then powers, then multiplication and division, then addition and subtraction.
- 6 + 4 × 3 = 18, not 30.
- −3^2 = −9, because the power is worked out before the minus sign. Type (−3)^2 to get 9.
- 2π means 2 × π. You can leave out the × sign before a bracket, π or a function.
Degrees or Radians?
Most school geometry and trigonometry uses degrees. Calculus, physics with angular speed, and most programming use radians.
- sin(30) in DEG = 0.5
- sin(30) in RAD ≈ −0.988
If every trig answer looks wrong, check the mode first. 180° equals π radians.
Common Errors
- “Error” after pressing =: usually a missing bracket or two operators in a row. Check the expression in the display.
- tan(90) in DEG mode has no value, because tangent is undefined at 90°.
- Square root or log of a negative number has no real answer.
- Very large factorials, above 170!, are too big to show and return ∞.
Scientific Calculator FAQs
Is this scientific calculator free?
Yes. There is nothing to download and no sign-up.
Can I type on my keyboard?
Yes. Click the display and type. Use ^ for powers, * or × for multiply, / or ÷ for divide, and press Enter for the answer.
How do I enter scientific notation?
Use the EXP key or type E. 3 × 10⁸ is entered as 3E8. To convert numbers into this form, use the scientific notation calculator.
Can I use this calculator in an exam?
That depends on your exam’s rules. Many exams only allow approved handheld calculators. For homework and revision, read our calculator tips for students.
For specific tasks, a dedicated tool with the steps shown is often quicker: the square root calculator for simplified radicals, the fraction calculator for exact fractions, and the percentage calculator for percentages.
How we checked this page: every example in the key table was typed into the calculator and matches the value worked out by hand.