Build a batch
Three numbers in, a full recipe out
Next step: Honey must carries almost no nitrogen of its own. Size the staggered nutrient additions for this batch.
Mead Nutrient Calculator →How the Honey Weight Is Worked Out
Every recipe calculation here runs backwards from the finish. You state where fermentation should end and how strong the mead should be, and the arithmetic works out where it has to start.
The gap between original and final gravity is what the yeast converts to alcohol. Using the standard factor, that gap in gravity points divided by 131.25 gives the alcohol by volume, so a target ABV and a target final gravity fix the original gravity between them:
Honey is then dosed to reach that original gravity. This site uses a conservative figure of 3.75 grams of honey per litre per gravity point, equivalent to about 32 points per pound per gallon, which is the same constant the back-sweetening calculator uses so the two agree.
Water is the batch volume minus the space the honey occupies. Honey is dense, near 1.42 kilograms per litre, so a five gallon batch of standard mead displaces close to a gallon of water on its own. Ignoring that is the most common reason a first batch overshoots the fermenter and finishes weaker than planned.
Choosing a Target Before You Choose a Recipe
Strength. Session meads sit around 6 to 8 percent and are drinkable within weeks. Standard meads run 11 to 14 percent and want a few months. Sack meads above 16 percent need a high tolerance yeast, disciplined nutrient additions and a year or more of patience. Pick the timescale you actually have.
Sweetness. The setting above assumes fermentation stops where you want it to, which in practice means choosing a yeast whose alcohol tolerance is close to the potential of the must. That is a blunt instrument. The repeatable route is to ferment dry, stabilise, and back-sweeten to taste afterwards.
Yeast. Check the tolerance rating against your target before anything else. A yeast rated to 14 percent will not deliver a 16 percent mead however much honey goes in: it will stall, leave the rest as residual sugar, and taste hot rather than sweet.
Nutrients. Honey is nearly sterile of nitrogen. A must left unfed ferments slowly, stalls, and produces the harsh solvent character often blamed on the honey itself. Staggered additions across the first half of fermentation are not optional in mead the way they nearly are in a grain wash.
Where This Calculator Stops
This page designs the batch. It does not measure it. Three things still need a hydrometer and your own judgement:
Confirm the starting gravity. Honey from one supplier is not honey from another. Dissolve, mix thoroughly, take a reading, and adjust before pitching rather than discovering the gap at the end.
Confirm the finish. Two identical readings twenty four hours apart mean fermentation is done. A single reading at the target number means nothing on its own.
Confirm what you actually got. Once fermentation is complete, the mead ABV calculator converts your real original and final gravity into the strength you achieved, which is rarely exactly the strength you planned.