AI Calculator
Ai calculator works out Result and Unrounded result from Expression, Arithmetic and Variables (optional). The default figures on this page give result of 12; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Read "what is fifteen percent of eighty" as the expression 15 / 100 * 80.
- Evaluate 15 ÷ 100 × 80 using standard operator precedence.
- 15 ÷ 100 = 0.15 → 0.15 × 80
- 0.15 × 80 = 12 → 12
Step-by-step workingtable
Its 12 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
4 sources
What the ai calculator calculates
Adds, subtracts, multiplies, divides and exponentiates numbers, either as a free-form expression evaluated with correct operator precedence, as two named operands, as a list folded left to right, or as a sum written out in words — in binary floating point or in exact fraction arithmetic.
How to use this ai calculator
Enter Expression, Arithmetic, Variables (optional) and Number display. Result updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Result, Unrounded result and Expression evaluated.
The method follows ISO 80000-2, Quantities and units — Part 2: Mathematics (operator symbols and precedence), NIST Digital Library of Mathematical Functions, §1.1 Notation, IEEE 754-2019, Standard for Floating-Point Arithmetic and Unicode CLDR number formatting patterns (es-ES decimal comma, en-IN lakh/crore grouping).
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
Is there a calculator that uses AI?
Adds, subtracts, multiplies, divides and exponentiates numbers, either as a free-form expression evaluated with correct operator precedence, as two named operands, as a list folded left to right. Put your own figures in above and the working updates beside the result. For scale, the default figures on this page give 12.
Is there a free AI calculator available?
The calculation is free and does not require an account. An account is only needed for optional features such as saving, comparing, exporting, or sharing supported scenarios.
What information do I need for the ai calculator?
You need Expression, Arithmetic, Variables (optional), Number display and Working shown. The page opens with default figures that give result of 12, so you can see the scale before entering your own.
What does this ai calculator show?
It shows Result, Unrounded result, Expression evaluated, Result with separators, Result as a fraction, Whole-number quotient, Remainder and Operation, with the working and any warnings for your entries.
Can I check how the ai calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.