About the online calculator
This basic calculator handles the everyday jobs: adding, subtracting, multiplying, dividing, percentages and sign changes. It works left to right like the electronic desk calculators of the 1970s, and its green vacuum-fluorescent style display shows up to eight digits.
Use your keyboard for speed: number keys, + − * /, Enter for equals, Backspace to clear the entry and Esc to clear everything. Need functions such as sine, logarithms or exponents? Try the scientific calculator.
Formula
Operations run left to right in the order you press them: 2 + 3 × 4 = 20 on this calculator, just like a basic desktop model. Use the scientific calculator for standard order of operations.
Frequently asked questions
Why does 2 + 3 × 4 equal 20 here?
Basic calculators evaluate each operation as you press it, so 2 + 3 = 5 and then 5 × 4 = 20. The scientific calculator follows the standard order of operations and gives 14.
What happens with an error?
An E on the display means divide by zero or a number longer than eight digits. Press C to reset.
Does it round decimals?
Results are rounded to fit eight digits and to remove floating-point noise, so 0.1 + 0.2 shows 0.3.