How to Use a Scientific Calculator
A scientific calculator extends the basic four operations with advanced mathematical functions essential for algebra, trigonometry, calculus, physics and engineering. Understanding the key functions saves time and prevents errors in complex calculations.
Trigonometric Functions
Sine cosine and tangent are the three primary trigonometric functions used in geometry and physics. Always check whether you need degrees or radians before calculating — use the DEG/RAD toggle at the top. Inverse trig functions sin⁻¹ cos⁻¹ tan⁻¹ find the angle when you know the ratio.
Logarithms and Exponentials
Log base 10 (log) and natural logarithm (ln) are essential in chemistry, physics and finance. The log function tells you the power of 10 needed — log(1000) = 3. The ln function uses base e. These are inverses of their exponential counterparts — 10^x and e^x.
Memory Functions
- M+ : Adds current display to memory
- M− : Subtracts current display from memory
- MR : Recalls stored memory value
- MC : Clears memory to zero
Order of Operations (BODMAS/PEMDAS)
Scientific calculators follow BODMAS — Brackets, Orders, Division, Multiplication, Addition, Subtraction. Use parentheses to control calculation order. For example 2 + 3 × 4 = 14 but (2 + 3) × 4 = 20. Always use brackets when in doubt about order!
Frequently Asked Questions
How do I calculate sine cosine and tangent? +
Enter the angle value then press sin cos or tan. Make sure you are in the correct angle mode — degrees for most everyday calculations or radians for advanced mathematics. For example sin(30°) = 0.5 meaning in a right triangle with a 30 degree angle the opposite side is half the hypotenuse. Use the DEG/RAD toggle at the top of our calculator to switch modes instantly.
What is the difference between degrees and radians? +
Degrees and radians are two units for measuring angles. A full circle is 360 degrees or 2π radians. To convert degrees to radians multiply by π divided by 180. To convert radians to degrees multiply by 180 divided by π. Most everyday calculations use degrees while advanced mathematics physics and engineering use radians. Our calculator has a DEG/RAD toggle to switch instantly.
How do I calculate logarithms? +
Press log for base 10 logarithm or ln for natural logarithm then enter the number. Log base 10 asks what power of 10 gives you the number — log(100) = 2 because 10² = 100. Natural log uses base e — ln(e) = 1. For any other logarithm base use the change of base formula: log base b of x = ln(x) divided by ln(b).
What does EXP or E notation mean on a calculator? +
EE or EXP is scientific notation for very large or very small numbers. 6.02E23 means 6.02 × 10²³ which is Avogadro's number. 1.6E-19 means 1.6 × 10⁻¹⁹. Press EE then enter the exponent. This notation is essential in physics chemistry and astronomy where numbers span enormous ranges. Our calculator displays results in scientific notation automatically when numbers are very large.
How do I use the memory functions M+ MR MC? +
M+ adds the current display value to memory. M− subtracts from memory. MR recalls the stored memory value to the display. MC clears memory to zero. Example: calculate 15 × 8 = 120 then press M+. Do other calculations. Press MR to retrieve 120. The M indicator at the top shows the current memory value so you always know what is stored.
What is the factorial function and how do I calculate it? +
Factorial written as n! multiplies all positive integers from 1 to n. For example 5! = 5 × 4 × 3 × 2 × 1 = 120. Factorials grow extremely fast — 10! = 3,628,800 and 20! exceeds 2 quadrillion. Press the n! button after entering the number. Factorials are used in probability, combinations and permutations and are only defined for non-negative integers.
How do I calculate powers and roots on a scientific calculator? +
For powers press the base number then xʸ then the exponent. For example 2 then xʸ then 10 = 1024. For square root press √ before the number. For x² and x³ press the number first then the button. The calculator handles all standard power and root operations. For any root use the formula: nth root of x = x^(1/n) using the xʸ button.