Online Calculator: Basic and Scientific
This online calculator works like the one on your desk. Tap the keypad or type with your keyboard to add, subtract, multiply and divide, use brackets and percent, and press equals for the answer. Switch on the scientific row for square roots, powers, logarithms, sine, cosine, tangent, pi and factorials, with a degrees or radians choice. Memory keys store a number, and a history list lets you reuse earlier results. It runs in your browser, so there is nothing to install and nothing is sent anywhere.
Online Calculator
A free calculator with keypad, keyboard entry, memory and history.
How to use the Online Calculator
- Type on your keyboard or tap the keypad to build your calculation.
- Use brackets, percent and the scientific row when you need them.
- Press = or Enter to see the result, and C to clear.
- Tap a line in the history to reuse an earlier answer.
How it calculates
The calculator follows the order of operations: brackets, powers, multiplication and division, then addition and subtraction. The percent key divides the number before it by 100. Results are rounded to 12 significant digits to hide floating-point noise such as 0.1 + 0.2.
Features
- Basic keypad with brackets and percent
- Scientific row: roots, powers, logs, trig, factorial
- Degrees and radians switch
- Memory keys M+, M-, MR and MC
- History of earlier calculations
- Works with keyboard and touch
Frequently asked questions
How do I use the online calculator?
Type the numbers and operators with your keyboard or tap the keypad, then press equals or Enter. The answer appears in the display, and the calculation is saved in the history.
How does the percent key work?
The percent key turns the number before it into a hundredth, so 50% is 0.5. To find 20 percent of 150, type 20%*150.
Does it follow the order of operations?
Yes. It calculates brackets first, then powers, then multiplication and division, and finally addition and subtraction.
How do I switch between degrees and radians?
Press the Deg/Rad button above the scientific keys. Degrees are the usual choice for school geometry, and radians are common in calculus.
Why do I get an error message?
An error shows when the expression is incomplete, has unmatched brackets or divides by zero. Fix the expression and press equals again.