Mead Nutrient Calculator: TOSNA & Staggered Additions

🍯 Mead Nutrient Calculator

Calculate TOSNA & staggered nutrient additions for Fermaid-O, Fermaid-K, and DAP

Quick Presets
🧮 Calculator
Total Nutrient
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grams
Per-Dose Amount
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grams / dose
Target YAN
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ppm (mg/L)
Go-Ferm (Rehydration)
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grams at pitch
📊 Nutrient YAN Contribution (per gram per liter)
40
Fermaid-O YAN (mg N / g / hL)
100
Fermaid-K YAN (mg N / g / hL)
210
DAP YAN (mg N / g / hL)
0
Go-Ferm YAN (rehydration only)
🍯 Recommended Rates by Batch Size
Batch SizeFermaid-O (TOSNA)Fermaid-KDAPGo-Ferm
1 gallon3.8 g total1.9 g total1.9 g total4.7 g at pitch
3 gallons11.4 g total5.7 g total5.7 g total14.2 g at pitch
5 gallons18.9 g total9.5 g total9.5 g total23.6 g at pitch
6 gallons22.7 g total11.4 g total11.4 g total28.4 g at pitch
10 gallons37.9 g total18.9 g total18.9 g total47.3 g at pitch
TOSNA Addition Schedule (4 Doses)
DoseTimingGravity CheckpointNotes
Dose 124 hours after pitchStart of lag phaseYeast are actively multiplying
Dose 248 hours after pitchActive fermentation beginsCO2 visible, temp rising
Dose 372 hours after pitch1/3 sugar depletedCheck gravity: ~(OG - FG) x 0.33
Dose 496 hours / 1/3 dropConfirm 1/3 sugar goneFinal nutritional boost
📈 Target YAN by Original Gravity
Original GravityBrix Approx.Target YAN (ppm)Notes
1.060 – 1.07514.7 – 18.3150 ppmSession mead, low ABV
1.076 – 1.09518.4 – 22.9200 ppmStandard traditional
1.096 – 1.11523.0 – 27.0250 ppmMedium-high gravity
1.116 – 1.13027.1 – 30.4300 ppmHigh gravity mead
Above 1.13030.5+350+ ppmSack mead / extreme gravity
🧪 Nutrient Comparison Chart
NutrientTypeYAN / g / hLTypical RateBest For
Fermaid-OOrganic (yeast hulls)40 mg N1.0 g/gal totalTOSNA, clean ferment
Fermaid-KInorganic + organic blend100 mg N0.5 g/gal totalStaggered additions
DAPInorganic (chemical)210 mg N0.5 g/gal totalSupplement with Fermaid-K
Go-FermRehydration nutrient0 (no YAN)1.25 g/galYeast rehydration only
Go-Ferm ProtectRehydration + sterols0 (no YAN)1.25 g/galHigh gravity / stressed yeast
💡 TOSNA Protocol: TOSNA (Tailored Organic Staggered Nitrogen Additions) was developed by Sergio Moutela and uses only Fermaid-O in 4 equal doses. It avoids off-flavors associated with heavy DAP use and produces cleaner meads. Total Fermaid-O dose is typically 3.0–4.0 g per gallon depending on gravity.
⚠️ DAP Warning: Do not add DAP above 65°F (18°C) or during active fermentation when temperatures are elevated. High temps cause DAP to produce hydrogen sulfide (H2S), giving your mead an unpleasant sulfur smell. Add DAP only during the first 48 hours when temps are still cool.
💡 Go-Ferm Tip: Go-Ferm is used exclusively during yeast rehydration — never add it to the must during fermentation. Mix Go-Ferm with water at 104°F (40°C), var cool to 95°F, add dry yeast, wait 15 minutes, then pitch. Use 1.25g Go-Ferm per gram of dry yeast.
🍯 Honey Note: Honey is naturally nutrient-poor. Unlike grape juice or apple juice, honey has very little nitrogen for yeast. Without adequate YAN, yeast become stressed and produce fusel alcohols and off-flavors. Proper nutrient additions are the single most important factor in making clean, drinkable mead quickly.

Mead, you might call it honey wine… Is simply fermented honey with water. You commonly mix in other ingredients: fruits, spices, grains or hops, depending on what you want.

The alcohol content ranges from around 3.5% to more than 18% In the first look it seems entirely easy: mix honey, water and yeast, leave it work, and here you have a golden drink. It can be still, bubbly or fully sparkling. About the taste, it ranges from dry to semi-sweet or even very sugary.

What is mead?

This drink probably is one of the most ancient drinks that folks made. Archaeologists found traces of mead-like drinks in old graves, also linked to King Midas, dating back around 8,000 years. For a long time it lived in a weird place, that kind of drink that you found only in medieval fairs or history reenactments.

But now the situaton changes. More and more average drinkers are curious about it as an alternative to beer or seltzer. Meaderies appear everywhere, from little shops to big companies.

Here is what separates mead from wine and beer. It bases on sugars of honey that yeast convert, while wine comes from fruits and beer from malted grains. Mead is like wine in how it is made and the alcohol punch.

Even the style of how you drink it is more like wine than beer, mostly because of the higher ABV. Even so calling it honey wine does not make it real wine, and wine sweetened with honey is not mead. Adding honey just for sweeten does not match that.

Here the difficult part: pure honey itself is too thick because of sugar for naturaly ferment. That high density stops it. So you must dilute it with water, so that yeast indeed work.

The charm of mead is its flexibility. From the start you control the sugar amount. One pound of honey per gallon?

Do that. Two pounds? Pour two.

It is that simple.

You commonly put fruit during the first fermentation. Fruits add nutrients that honey lacks and help yeast. You can be creative with other additions, creating many kinds of meads.

Some producers make entire lines; more than a dozen different variants, that show the range of that drink.

The serving depends on the strength. For light meads with beer-like ABV, fill a 12-ounce glass. For medium stuff from 8 to 15 %, use a wine glass or whiskey glass with around 4 ounces.

For a standard 5-ounce pour, aim for meads around 12 % ABV. Strong meads above 18 %? Three ounces suffice.

Sparkling meads taste best cooled to around 45 degrees. They pair well with salty bites. Olives, roasted nuts, seafood, smoked salmon, goat cheese

Like that.

Mead Nutrient Calculator: TOSNA & Staggered Additions

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