PlenumHubWhat this calculator can do
It opens as a simple calculator: digits, + − × ÷ and =. Tap the Scientific button above the keypad to reveal parentheses, trigonometry, logarithms, powers, roots, factorials and the π/e constants, for whenever you need more than basic arithmetic. Type an expression directly, or build one with the keypad, and it evaluates it following the standard order of operations (parentheses first, then powers, then multiplication and division, then addition and subtraction — PEMDAS). It supports:
- Basic operators: + − × (or *) ÷ (or /) and parentheses for grouping.
- Powers and roots:
^for exponents (e.g.2^10) andsqrt(x)for square roots. - Trigonometry:
sin(x),cos(x),tan(x)and their inverses, all in degrees (not radians). - Logarithms:
log(x)for base-10 log,ln(x)for natural log. - Factorials:
5!for 5 factorial (5 × 4 × 3 × 2 × 1). - Constants:
piande.
Order of operations
Expressions are evaluated with standard mathematical precedence: whatever is inside parentheses is calculated first, then powers and factorials, then multiplication and division (left to right), then addition and subtraction (left to right). For example, 2 + 3 * 4 is 14, not 20, because multiplication happens before addition. Use parentheses to force a different order, like (2 + 3) * 4 for 20.
Degrees, not radians
Calculators disagree on whether trigonometric functions default to degrees or radians. This one uses degrees, matching what most people expect from a general-purpose calculator and what's taught first in school (so sin(30) gives 0.5, not the radian-mode answer). If you need radians for a specific calculation, convert first: multiply your radian value by 180/pi before using it in a trig function here.
A note on precision
Like any calculator built on standard floating-point arithmetic, results for some expressions (particularly ones involving irrational numbers like π or repeating decimals) are shown to a limited number of decimal places rather than being mathematically exact. For most everyday and coursework use this makes no practical difference.
Frequently asked questions
Why does the calculator open in simple mode?
Most visits only need basic arithmetic, so the calculator opens simple and stays out of the way. Tap Scientific any time to add trigonometry, logs, powers, roots, factorials and parentheses; tap it again to go back to simple.
Does this use degrees or radians for trig functions?
Degrees. sin(30) returns 0.5, matching the standard degree-mode convention most calculators default to.
How do I calculate a square root or a power?
Use sqrt(x) for a square root, e.g. sqrt(16), and ^ for a power, e.g. 2^8 for 2 to the 8th power.
Can I use parentheses to control the order of operations?
Yes. Tap Scientific to reveal the parentheses keys, then (2 + 3) * 4 gives a different result (20) than 2 + 3 * 4 (14).
Why do I get an error for something like 5 / 0?
Division by zero is mathematically undefined, so the calculator shows an error instead of a result, rather than silently returning an incorrect number.