Enter a calculation, see the exact expression, and keep a useful copy of the answer. No hidden assumptions, no account, no invented data.
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This general arithmetic calculator builds an expression from keyboard input or keypad presses. JavaScript operator precedence multiplies three by four before adding two, so two plus three times four gives fourteen. Parentheses instead make two plus three happen first, and multiplying five by four gives twenty. Bars use twenty-five pixels per returned unit. The character whitelist admits digits, operators, parentheses, dots and whitespace before the expression is evaluated. It is not a symbolic algebra system or a deal-specific financial calculator. The title refers to Ireland, but its arithmetic has no currency, tax or legal rules. After evaluating an expression, the source uses fixed formatting with ten decimal places and then converts that text back into a number. One divided by three therefore displays point three three three three three three three three three three. The familiar floating-point sum point one plus point two is displayed as point three after this rounding. Bars use twelve hundred pixels per returned unit. This formatting hides some binary floating-point artifacts but does not make calculations exact arbitrary-precision arithmetic. Very small nonzero values may round to zero. A nonfinite result such as division by zero displays check expression and is not added as a successful history entry. Every successful expression and its rounded result are appended to a working trail and stored in local browser storage. The displayed trail is reversed so the latest calculation appears first. Clear and new calculation empty the current expression and reset its answer to zero, but they do not erase the stored trail. Bars show earlier fourteen and twenty entries at twenty-five pixels per result unit. The download contains the current expression and current displayed answer, not the complete history. Typing after a successful result appends to the same input instead of automatically starting a new expression. This explanation preserves those existing rules and does not claim full keyboard or expression-parser coverage.