A Scientific Calculator With No Ads — and No Rotating Required

Everything on the keypad

• Trigonometry: sin, cos, tan and their inverses (asin, acos, atan) with a one-tap DEG/RAD toggle.
• Logarithms & exponentials: ln, log, eˣ, 10ˣ, and arbitrary powers with correct right-associative precedence.
• Roots & factorials: square root, cube root, and factorial (up to 170!).
• Constants: π and e, plus your own named variables — define g=9.81 once and use it in any expression.
• Full expression editing: parentheses, an inline cursor, live result preview while you type, and 50 levels of undo.

Unlike the built-in iPhone calculator, scientific mode doesn't hide behind a landscape rotation — it's a first-class mode that works in portrait, landscape, and inside any panel.

Precision you can state precisely

CalcBoard's arithmetic (+, −, ×, ÷, powers, factorials) runs on exact decimal math — 0.1 + 0.2 = 0.3, exactly. Transcendental functions like sin and ln are computed to 15 significant digits, which is as much as any handheld scientific calculator gives you. We say this precisely because a calculator that's vague about precision isn't one you should trust.

Science happens in more than one panel

The reason to run scientific mode in CalcBoard instead of a single-view app: your scientific panel can sit next to a unit converter panel and a basic panel. Convert the measurement, run the formula, tally the results — all visible at once, with the shared value tray moving numbers between them.

Frequently Asked Questions