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.

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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.

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.
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.

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