Meadcalc cascades to Fermaid O.
Precision staggered nutrient addition calculator for mead. Hits your target YAN within US legal limits — Fermaid O first, then K, then DAP — automatically.
Calculate my batchFermaid O · Fermaid K · DAP
YAN, volume, limits, unit, effectiveness
Every gram calculated from YAN rates
Enter your target YAN and batch volume. Meadcalc builds the nutrient protocol from Fermaid O up — staying within US legal limits by default, overflowing back to Fermaid O only when K and DAP caps are reached.
Primary inputs
Recommended: 200–500 ppm for most yeasts
Account for batch-to-batch variation
Options & limits
Volume unit
Enforce legal limits
US: DAP ≤1.0 g/L, Fermaid K ≤1.0 g/L
Configure limits (g/L)
YAN rates: DAP 210 mg N/g/L · Fermaid K 100 mg N/g/L · Fermaid O 40 mg N/g/L (adjusted by effectiveness). Based on Travis Blount-Elliott's nutrient white paper.
Organic nitrogen. Better for flavor. Meadcalc allocates up to the 1.9 g/L soft cap before touching anything else.
Soft cap: 1.9 g/LInorganic, faster-releasing. Used only when Fermaid O is at capacity. Capped at 1.0 g/L per US commercial law.
Hard limit: 1.0 g/LPure inorganic nitrogen, highest YAN density. Reserved for when the first two sources are maxed out.
Hard limit: 1.0 g/LIf DAP and K hit their limits with YAN still unmet, Meadcalc returns to Fermaid O rather than violating the cap.
No legal violationPhilosophy
“Most nutrient calculators give you a number. Meadcalc gives you a protocol. One that respects organic nitrogen first, keeps your batch legal by default, and doesn't pretend that every gram of Fermaid O performs identically batch to batch. Mead fermentation is chemistry. Treat it that way.”
Organic first
Fermaid O produces cleaner flavor profiles at equivalent YAN. We prioritize it not because it's trendy — because the chemistry supports it.
Legal by default
Commercial meaderies and home brewers share the same calculator. Legal limits ship on by default. Toggle them off when you need to experiment.
Effectiveness-corrected
The 40 mg N/g/L rate is a mean. Your Fermaid O may be at 35 or 42. The effectiveness slider closes the gap between theory and practice.
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The Mead Lab
Stuck fermentations are one of the most frustrating problems a meadmaker can face — and improper nutrient scheduling is often the culprit. Staggered Nutrient Additions (SNA) keep your yeast healthy and active from pitch to terminal gravity. This guide walks you through exactly when and how much to add at each stage.
Not all nutrient protocols are created equal — TOSNA, Fermaid-O, and Fermaid-K each have passionate advocates in the meadmaking community. We break down the science, cost, and practical results of each approach so you can pick the best schedule for your next batch. Find out which protocol our Advanced SNA Calculator is optimized for.
From under-pitching nutrients to adding them all at once, small mistakes in your nutrient regimen can tank an entire batch of mead. We've compiled the 10 most common errors meadmakers make — and show exactly how a staggered nutrient calculator takes the guesswork out of the equation. Your yeast will thank you.
YAN — Yeast Assimilable Nitrogen — is the single most important variable in crafting a clean, fully fermented mead, yet most beginner meadmakers have never heard of it. This comprehensive guide explains what YAN is, how to calculate your target, and why different honey varieties and starting gravities demand completely different nutrient loads. Master YAN and you'll never have an off-flavor batch again.
High-gravity meads starting above 1.120 OG push yeast to their absolute limits — and the honey variety you choose dramatically affects how much nutrient support they'll need. We rank the most popular honey types for high-gravity brewing and show you how to dial in your SNA schedule using a nutrient calculator for each one. Whether you're brewing a traditional sack mead or a bochet, this guide has you covered.