Wine math without the spreadsheet.

How to use BottleMath

Use the calculator, then challenge the assumption

The useful number is rarely the first number you see. An en primeur offer needs duty, VAT, delivery, and storage added before it can be compared with a duty-paid bottle. A wedding order needs a realistic split between wine drinkers, beer drinkers, and guests who will not drink much at all. A corkage decision needs the bottle you own, the corkage fee, and the best acceptable bottle on the restaurant list.

That is the point of BottleMath: make the hidden assumption visible. The calculators are deliberately plain about their inputs, so you can overwrite a default rate, test a cautious case, and see whether the decision still makes sense.

What makes the results useful

Every result should be treated as a planning estimate, not a promise. Wine duty rates, venue corkage policies, delivery charges, exchange rates, cellar storage fees, and lab measurements can all change the final answer. The value of the tool is that it gives you a clean structure for the comparison before you spend money, commit bottles, or make a cellar adjustment.

BottleMath does not sell wine or process orders. It is an independent calculator site for people who want the arithmetic behind a wine decision to be clear enough to check, edit, and challenge.