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Scientific Calculator
A pocket scientific calculator that evaluates whole expressions, not just one operation at a time. Type or tap — sin(30), 2^10, 5!, log(1000), sqrt(144) — and press = for the answer. Degrees are the default angle mode; switch to RAD for radians, and tap 2nd for inverse trig, 10^x, e^x, x^3 and cube root.
Angles are in degrees by default (sin(30) = 0.5). Tap DEG to switch to radians. % divides by 100, so 200×10% = 20. Results are rounded to 12 significant figures. Functions need parentheses, e.g. sin(30) — and you can type expressions directly, including * for multiply, / for divide and ^ for powers. EXP enters scientific notation: 2 EXP 3 = 2×10³ = 2000.
How it works
The calculator reads your whole expression and applies the standard order of operations: parentheses first, then powers and roots, then multiplication and division, then addition and subtraction. Powers group right-to-left, so 2^3^2 means 2^(3^2) = 512, not (2^3)^2 = 64. Trigonometry uses degrees by default: sin, cos and tan take an angle in degrees, and their inverses return degrees; tap DEG to switch to radians. log is base 10 and ln is the natural log (base e). n! is the factorial (5! = 5×4×3×2×1 = 120, for whole numbers 0–170). % divides by 100, so it is used for percentages: 200×10% = 20. EXP enters scientific notation: 2 EXP 3 = 2×10³ = 2000. ANS recalls the last answer, and tapping an operator right after = starts a new calculation from it. Multiplication signs are optional where they are unambiguous: 2π, 3(4+5) and (2)(3) all work. Results are rounded to 12 significant figures. Worked example 1: sin(30°) = 0.5, cos(60°) = 0.5, tan(45°) = 1. Worked example 2: 2+3×4 = 14 (multiplication before addition), (2+3)^2 = 25, 2^10 = 1024. Worked example 3: log(1000) = 3 because 10³ = 1000; ln(e) = 1; √144 = 12. Worked example 4: 5! = 120; 1/3 = 0.333333333333; 2π = 6.28318530718; asin(0.5) = 30°. Worked example 5: 2^-2 = 0.25, and 200×10% = 20.
Frequently asked questions
How do I use the scientific calculator?
Type an expression into the box or tap the keys, then press =. It evaluates the whole expression at once, following the standard order of operations: parentheses, powers, multiplication and division, then addition and subtraction. Try sin(30)+2^10 — the answer is 1024.5.
What is the difference between DEG and RAD?
DEG means angles are measured in degrees (a full circle is 360°), RAD means radians (a full circle is 2π). Degrees are the default, because sin(30) = 0.5 is what most people expect. If you are working in radians — common in calculus and physics — tap DEG once to switch to RAD; inverse trig answers switch units too.
How do I calculate a factorial?
Type a whole number and tap n!, or type it directly, e.g. 5!. The factorial multiplies every whole number down to 1: 5! = 5×4×3×2×1 = 120, and 0! = 1 by definition. Factorials grow fast — 20! is already about 2.4×10¹⁹ — so this calculator accepts whole numbers from 0 to 170.
What does the % key do?
It divides by 100. That is how percentages work in expressions: 200×10% = 20, and 50+50×20% = 60 (a 20% increase on 50). If you want a percentage of a number, multiply the number by the percentage: 15% of 80 is 80×15% = 12.
What is the 2nd key for?
It switches the function keys to their second functions: sin becomes sin⁻¹ (arcsine), cos becomes cos⁻¹, tan becomes tan⁻¹, log becomes 10ˣ, ln becomes eˣ, x² becomes x³, and √ becomes cube root. Tap 2nd again to switch back.
Why does the calculator say my expression is an error?
The usual causes are mismatched parentheses, a function without its parentheses (type sin(30), not sin 30), a square root or log of a negative number, dividing by zero, or asin/acos of a value outside −1 to 1. The message under the display says which rule was broken.
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