AI Calculator

Use + - * / ^ ( ) and % for remainder. Multiplication and division are done before addition and subtraction. In "words" mode, type the sum in plain English instead.
Exact mode reads every decimal you type as a fraction and works in whole-number numerators and denominators. It cannot use pi, e or functions such as sqrt.
Name a value the expression may use, e.g. "l = 12, w = 7" with an expression of 2 * (l + w).
Changes how the answer is written out. It never changes the arithmetic.
Result
12
Basic Arithmetic Calculator
Unrounded result
12
Expression evaluated
15 / 100 * 80
Result with separators
12
Result as a fraction
12
Operation
Expression
Arithmetic used
Binary floating point (IEEE-754 double)
Worked out from ISO 80000-2, Quantities and units — Part 2: Mathematics (operator symbols and precedence) and 3 other sources.

How this is worked out

4 steps
  1. Read "what is fifteen percent of eighty" as the expression 15 / 100 * 80.
  2. Evaluate 15 ÷ 100 × 80 using standard operator precedence.
  3. 15 ÷ 100 = 0.15 → 0.15 × 80
  4. 0.15 × 80 = 12 → 12
Step-by-step workingtable
15 ÷ 100 = 0.15 → 0.15 × 80, 0.15 × 80 = 12 → 12

Results are general information, not financial, tax, legal, medical or engineering advice.