How to Use a Scientific Calculator: A Practical Guide
Scientific calculators look intimidating with their rows of unfamiliar keys, but they follow one consistent logic. Master the six families of operations and you can handle almost any calculation.
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Order of Operations Is Automatic
Scientific calculators apply the standard hierarchy: parentheses, then powers, then multiplication and division, then addition and subtraction. Type 2 + 3 × 4 and the calculator returns 14, not 20. Use parentheses to force a different order: (2 + 3) × 4 = 20.
Powers and Roots
x² squares the displayed value, x^y raises to any power, and √ takes the square root. To compute 2^10, enter 2, press x^y, enter 10, press =. To compute the cube root of 27, enter 27, then 27^(1/3) using parentheses.
Trigonometry: Degrees vs Radians
sin, cos and tan expect an angle — but the unit depends on the mode. Degrees are the default on most calculators and the right choice for everyday problems (a 30° angle); radians are used in calculus and physics. The DEG/RAD toggle switches between them. A classic error: computing sin(30) in radian mode gives −0.988 instead of 0.5.
Logarithms
log is the base-10 logarithm; ln is the natural logarithm (base e). They answer "what power of 10 (or e) gives this number?" log(1000) = 3 because 10³ = 1000. To compute a logarithm in another base, use log(x) ÷ log(base).
Constants and Memory
π (pi) and e are one-key constants. Memory functions — MS (store), MR (recall), M+ (add to memory), MC (clear) — let you save intermediate results. Store a value with MS, continue calculating, then recall it with MR when needed.
Practice Online
The scientific calculator on this site mirrors all of this — click or type, switch DEG/RAD, use memory, and copy results. It runs entirely in your browser.
Article FAQ
What does DEG vs RAD mean?
The angle unit for trig functions. Degrees (DEG) split a circle into 360; radians (RAD) use 2π. Use the toggle to match your problem.
How do I calculate a square root?
Type the number and press √, or use the power key: x^0.5.
What is the difference between log and ln?
log is base 10; ln is base e (≈2.718). Both are one-key functions on any scientific calculator.