Basic Calculator
A full-keypad online calculator — arithmetic, percentages, powers, roots, factorial and trigonometry (in degrees or radians), with live results as you type.
Calculate
Tap the keypad or type on your keyboard — the result updates live, and = saves it to your history.
What this calculator can do
- Arithmetic
- +, −, ×, ÷, parentheses, and % (percent = value ÷ 100)
- Powers & roots
- xy (power), √ (square root), x² via Inv, x! (factorial)
- Trigonometry
- sin, cos, tan — switch Deg/Rad, or use Inv for sin⁻¹, cos⁻¹, tan⁻¹
- Logarithms
- ln (natural log) and log (base 10) — use Inv for eˣ and 10ˣ
- Constants & memory
- π, e, EXP (scientific notation), and Ans (your last result)
How to use this calculator
- Tap number and operator keys, or type directly on your keyboard — the display updates live as you build your expression.
- Press = (or Enter) to get the final result and save it to history.
- Use Deg/Rad for trigonometry, and Inv to access inverse functions like sin⁻¹ or eˣ.
- Tap the clock icon to reopen a past calculation, or press AC to start over.
FAQ
Frequently asked questions
What operations does this calculator support?
Addition, subtraction, multiplication, division, percentages, parentheses, powers (x^y), square root, factorial, natural and base-10 logarithms, and sine, cosine and tangent in degrees or radians — plus their inverse functions via the Inv key.
What happens if I divide by zero?
Division by zero is undefined, so the calculator shows "Error" instead of an invalid result.
How do I switch between degrees and radians?
Tap Deg or Rad at the top-left of the keypad. This affects sin, cos, tan and their inverse functions.
What does the Inv key do?
It switches sin/cos/tan to their inverse (sin⁻¹/cos⁻¹/tan⁻¹), ln to eˣ, log to 10ˣ, and √ to x².
Does it remember my past calculations?
Yes — tap the clock icon to see your recent calculations, saved locally in your browser. Use Ans to reuse your last result in a new expression.