Scientific Calculator.

The best scientific calculator is the one that fits your situation: a handheld model such as a TI or Casio is great for exams, while an online scientific calculator is best for everyday use because it is free, needs no installation, and supports full keyboard input. Calculator Proof's scientific calculator includes trigonometry, logarithms, exponents, memory functions, and a calculation history, so you can work on any device without extra hardware.

No. A basic calculator handles only the four operations — addition, subtraction, multiplication, and division — plus sometimes percentages and square roots. A scientific calculator adds advanced functions like trigonometry (sin, cos, tan), logarithms, exponents, and memory. For those operations, use a scientific calculator such as the free one on Calculator Proof.