qcalculator.net

Scientific Calculator

A full scientific calculator for trigonometry, logarithms, powers, roots and factorials. Type an expression or tap the keys — it follows standard order of operations and works in degrees or radians. It handles the everyday needs of algebra, geometry and physics homework, engineering sanity checks and statistics coursework without installing anything — and because the whole expression stays visible while you type, it's easy to spot and fix a mistyped bracket before evaluating.

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How it works

The calculator evaluates a whole expression at once, honouring the usual order of operations (PEMDAS): parentheses first, then exponents, then multiplication and division, and finally addition and subtraction.

Worked example

Evaluate 2 + 3 × 4²:

In DEG mode, sin(30) = 0.5; in RAD mode, sin(π ÷ 6) = 0.5.

A second example mixing functions: √(3² + 4²) evaluates the squares first (9 + 16 = 25), then the root — 5, the classic 3-4-5 right triangle. And 5! (factorial) = 5 × 4 × 3 × 2 × 1 = 120, the number of ways to arrange five items.

Frequently asked questions

How do I switch between degrees and radians?
Tap the RAD/DEG key (top-right of the keypad). It toggles how the sin, cos and tan functions interpret angles. RAD treats inputs as radians; DEG treats them as degrees.
Why does sin(30) give a weird answer?
You're almost certainly in radian mode. sin(30°) = 0.5 in DEG mode, but sin(30 radians) ≈ −0.988. Trig functions on most calculators default one way or the other — always check the mode indicator before trusting a trig result.
Does it follow order of operations?
Yes. The whole expression is parsed and evaluated together using standard precedence (PEMDAS): parentheses, then exponents, then × and ÷, then + and −. Use parentheses to override the default order.
What's the difference between ln and log?
ln is the natural logarithm (base e ≈ 2.71828) and log is the common logarithm (base 10). For example, ln(e) = 1 and log(100) = 2.
Can I use my keyboard?
Yes. Type digits and the operators + − * / ^ ( ) % directly. Press Enter or = to evaluate, Backspace to delete, and Escape to clear.
How big a factorial can it compute?
Factorials grow explosively — 170! ≈ 7.3 × 10³⁰⁶ is the largest that fits in standard floating-point; beyond that the result overflows to infinity. Factorials are only defined here for non-negative whole numbers.

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