Scientific Calculator

Step by step

1. Type an expression the way you would write it — 3(4+5), 2^10, sin(30) — or tap the keys. The two are interchangeable.
2. Press Enter (or =) to commit the answer. Until then the big number is a live preview, so you can watch a long expression take shape.
3. Switch between DEG and RAD before doing trig. The flag applies at the moment you evaluate, so flipping it re-runs the preview immediately.
4. Use ans to reuse the last answer and m to use memory. M+ adds whatever is currently in the box to memory.
5. Click any line in the history to paste it back in — useful for changing one number in a long formula instead of retyping it.

Good to know

• Multiplication signs are optional next to brackets and constants: 2pi, 3(x+1) and 4sqrt(9) all work.
• Functions always need their brackets. sin 30 is rejected on purpose — sin 30 + 5 is ambiguous and silently guessing is how wrong answers happen.
• ^ is right-associative, so 2^3^2 is 2⁹ = 512, matching standard mathematical convention rather than left-to-right.
• Bars give absolute value: |3-7| is 4. So does abs(3-7).
• Factorial works on non-integers too, via the gamma function — 0.5! is ≈ 0.8862, which is √π ⁄ 2.
• Use E for scientific notation: 6.02E23.

The maths behind it

• Order of operations brackets → functions → ! → ^ → × ÷ mod → + − Unary minus binds tighter than ×, looser than ^, so −3² is −9.
• Change of base log_b(x) = ln(x) ÷ ln(b) Use this when you need a logarithm in a base other than 10 or e.
• Degrees and radians radians = degrees × π ÷ 180 The DEG/RAD switch does this for you on the trig functions.
• Factorial by gamma n! = Γ(n + 1) Lets the factorial key answer for fractional inputs.