FermCalc - Miscellaneous Calculators

Dry Weight/Volume Converter

Introduction

The Dry Weight/Volume Converter converts between dry weight (mass) and dry volume for a number of common winemaking additives.  This calculator is intended mainly for home winemakers who don't have accurate scales, and instead add ingredients on the basis of dry volumes (teaspoons, mL, etc.).

Input Field Definitions

Additive – The additive for which the conversion is being made.  Select from the long list of common (and not-so-common) additives.

Dry Weight – The dry weight (mass) of the additive.  This field can be either an input field or an output field.  If it is used as an input field, the dry volume is calculated from the entered value.

Dry Volume – The approximate dry volume of the additive.  This field can be either an input field or an output field.  If it is used as an input field, the dry weight (mass) is calculated from the entered value.

Calculation Details

All of the conversion factors are based on Jack Keller's "Measuring Additives in Winemaking", except for the sugar and sodium metabisulfite conversions which are based on my own measurements. Please be aware that these conversions are approximate.

Back to top

Stock Solution Formulation Calculator

Introduction

The Stock Solution Formulation Calculator determines the amount of an additive required to yield a stock solution with a given volume and concentration.

Input Field Definitions

Target Concentration – The desired concentration of the additive in the stock solution.

Solution Volume – The volume of the stock solution being made.

Output Field Definitions

Mass of Additive Required – The mass of the additive required to yield the desired concentration of the additive in the specified volume of stock solution.

Calculation Details

Concentration is mass per unit volume. So, the required mass is simply the desired volume multiplied by the desired concentration, or:

ma = vscs (1)

where

ma = mass of additive, kg
vs = solution volume, liters
cs = concentration of substance in solution, kg/L
Back to top

Inverse Stock Solution Makeup Calculator

Introduction

The Inverse Stock Solution Makeup Calculator determines the amount of an additive required to yield a stock solution such that a specific volume of the solution will result in a desired increase in concentration of the additive in a specific volume of wine.

Input Field Definitions

Total Solution Volume – The total volume of the stock solution being made.

Wine Volume – The volume of wine being treated.

Volume of Solution Added – The volume of stock solution to be added to the wine.

Total Dosage – The desired increase in concentration of the additive in the given volume of wine.

Output Field Definitions

Mass of Additive Required – The mass of the additive required to make the given volume of stock solution.

Calculation Details

This calculation determines the amount of a substance required to yield a stock solution such that a specific volume of the solution will result in a specific increase in concentration in a specific volume of wine, as described by Ben Rotter (2008).

The mass of the substance that we want to add to the wine is equal to the volume of the wine multiplied by the desired concentration increase in the wine, or:

mw = vwcw (2)

where

mw = mass of additive added to the wine, kg
vw = wine volume, liters
cw = concentration of the additive in the wine, kg/L

The mass of the substance to be added to the wine is also equal to the volume of the solution to be added to the wine multiplied by the concentration of the stock solution, or:

mw = vacs (3)

where

va = volume of the solution to be added to the wine, liters
cs = concentration of the additive in the solution, kg/L

This mass of the additive required in the solution is the total volume of the solution multiplied by the concentration of the solution:

ma = vscs (4)

Substituting equations 2 and 3 into equation 4 gives:

ma = vwcwvs / va (5)
Back to top

Miscellaneous Additions Calculator

Introduction

The Miscellaneous Additions Calculator determines the amount of an additive to add to a wine to yield a desired concentration in the wine, given the initial concentration of the additive and volume of the wine. The additive can either be in the form of a solid (powder or crystals) or a liquid (stock solution).

Input Field Definitions

Additive Type – Select from either solid (powder/crystals) or liquid (stock solution).

Solution Concentration – The concentration of the additive in the stock solution being added.  Required only if liquid (stock solution) was selected as the additive type.

Target Concentration – The desired concentration of the additive.

Initial Concentration – The current concentration of the additive.

Wine Volume – The volume of the wine being treated.

Output Field Definitions

Mass of Additive Required – The mass of the additive required to yield the desired concentration in the specified volume of wine.  Reported only if solid (powder/crystals) was selected as the additive type.

Volume of Solution Required – The volume of stock solution required to yield the desired concentration in the specified volume of wine.  Reported only if liquid (stock solution) was selected as the additive type.

Calculation Details

This calculation determines the amount of a substance to add to a wine to yield a desired concentration in the wine, given the initial concentration of the substance and the wine volume. The substance can either be in the form of a solid (powder or crystals) or a liquid (stock solution).

If it is being added as a liquid, the concentration of the solution must be specified. It is assumed that the volume of the additive is negligible compared to the volume of the wine, and that the increase in volume due to the addition can be ignored. If the volume of the solution addition is greater than 10% of the volume of the wine, FermCalc will issue a warning message. In this case, consider doing a blending calculation to account for the impact of the volume increase on the final concentration.

The total mass of a substance in solution is simply the initial mass of the substance plus the mass that is added, or:

mt = mi + ma (6)

where

mt = total mass of substance, kg
mi = initial mass of substance, kg
ma = mass of substance added, kg

Since mass is volume multiplied by concentration we can write:

vwct = vwci + ma (7)

where

vw = wine volume, liters
ct = total (target) concentration, kg/L
ci = initial concentration, kg/L

Rearranging and solving for ma we get:

ma = vw(ct - ci) (8)

If the substance is being added as a stock solution, we need to calculate the volume of the solution to add. To do this we simply need to substitute equation (1) for ma in equation (5) and rearrange to get:

vs = vw(ct - ci)/cs (9)
Back to top

Yeast Assimilable Nitrogen (YAN) Calculator

Introduction

The Yeast Assimilable Nitrogen (YAN) Calculator determines the yeast nutrient additions required to supply the desired YAN level in a must.  The total YAN requirement is calculated based on the nitrogen requirements of the selected yeast strain and on the initial SG of the must.  The required masses of the selected nutrients are then calculated based on their nitrogen contents.  The additions can be scheduled in stages, with up to three nutrients added in up to four stages.

Input Field Definitions

Number of Nutrients – The number of yeast nutrients to be used over the course of the fermentation.  Up to three nutrients can be selected.

Number of Stages – The number of staged nutrient additions to be used.  Up to four stages can be used.

Yeast – The yeast strain to be used.  If your yeast strain is not listed, select from one of the three generic entries at the top of the list.

Nutrient (1, 2, 3) – The yeast nutrients to be used in the various stages.

Fermaid O Efficiency Factor – The organic nitrogen in Fermaid O is reportedly utilized by the yeast 3 to 4 times more efficiently than nitrogen in other nutrients.  This factor allows the user to account for this enhanced efficiency.  It is generally set to a value of 3, and is increased to a value of 4 if GoFerm is used during yeast rehydration.  Set it to a value of 1 if you want to ignore it.

Must Volume – The volume of the must being treated.

Must SG – The initial SG of the must being treated. Range: 1.0 to 1.55454

Yeast Multiplier – The factor in mgN/g sugar that is multiplied by the sugar content of the must to calculate the total YAN required.  This is initially determined from the yeast strain selected above, but it can be overridden by the user.  A range is not enforced, but it should be in the range from 0.5 to 1.5.

Total YAN Required – The total YAN requirements over the course of the fermentation.  This is calculated based on the yeast strain and the must SG, but it can be overridden by the user.

Initial Must YAN Level – The estimated initial YAN concentration of the must, prior to the addition of any nutrients.  This needs to be estimated by the user.

Relative Mass or YAN Contribution at Each Stage – The relative mass or YAN contribution for each nutrient at each stage.  These values determine the mass or YAN allocation between the specified nutrients, as well as the allocation of each nutrient between the stages.  The proportional contribution for a given nutrient at a given stage will be the value entered in the corresponding field divided by the sum of the values in all of the fields.  These fields are required only if either the number of nutrients or the number of stages are greater than one.

Output Field Definitions

YAN Deficiency – The amount of YAN that needs to be supplied by the added nutrients, which is simply the difference between the total YAN required and the initial must YAN level.

Mass to Add – The mass of each nutrient at each stage needed to supply the total YAN requirements.

Addition Rate – The calculated mass per unit volume of each nutrient at each stage.  This allows the user to compare the calculated addition rates to those recommended by the manufacturer or to any legal maximums.

Calculation Details

All calculations are based on guidelines in the 2015 and 2016 versions of the Scott Labs Fermentation Handbook.  These guidelines recommend calculating the YAN requirements as a function of the sugar content of the must as summarized below in the 2015 Handbook:

Nitrogen Needs

This is calculated in FermCalc as:

nt = y·10·Bisgiρw (10)

where

nt = total YAN requirements, mg/L (ppm)
y = yeast multiplier, mgN/g sugar
Bi = initial Brix of the must
sgi = initial sg of the must
ρw = density of water = 0.9982 g/mL at 20°C (68°F)

The table below compares the results of equation (10) for values of y of 0.90 and 1.25 to the recommended YAN levels of Bisson and Butzke (2000), which are cited frequently on other web sites.  It can be seen that the Bisson and Butzke recommendations generally fall between the Scott Labs medium and high recommendations.  FermCalc gives the user the ability to override the yeast multiplier and/or the calculated YAN requirement.

°Brixg/L SugarYAN Requirements mg/L
Medium
y = 0.90
High
y = 1.25
Bisson &
Butzke
21227.9205.1284.9200
23251.7226.5314.6250
25275.9248.3344.9300
27300.5270.4375.6350

The YAN deficiency is the total YAN requirement minus the initial must YAN level, assuming that the contribution of yeast rehydration nutrients are negligible:

nd = nt - nm (11)

where

nd = YAN deficiency, mg/L (ppm)
nm = initial must YAN level, mg/L (ppm)

Masses to be added are calculated from the nitrogen balance:

v·nd = Σmijni (12)

where

v = must volume, L
mij = mass of nutrient i required at stage j, mg
ni = nitrogen content of nutrient i, fraction
Back to top

Yeast multipliers based on the Scott Labs guidelines are listed below:

ManufacturerBrandStrainNitrogen
Requirements
Multiplier
OtherOtherYeast with Low YAN NeedsLow0.75
OtherOtherYeast with Medium YAN NeedsMed0.9
OtherOtherYeast with High YAN NeedsHigh1.25
OenobrandsAnchorAlchemy IMed0.9
OenobrandsAnchorAlchemy IIMed0.9
OenobrandsAnchorExotics SPHMed0.9
OenobrandsAnchorNT 112Med0.9
OenobrandsAnchorNT 116Med0.9
OenobrandsAnchorNT 202Med0.9
OenobrandsAnchorNT 50Med0.9
OenobrandsAnchorVIN 13Low0.75
OenobrandsAnchorVIN 2000Low0.75
LallemandEnofermAssmanshausen (AMH)Low0.75
LallemandEnofermCSMHigh1.25
LallemandEnofermM2High1.25
LallemandEnofermRP15Med0.9
LallemandEnofermSyrahMed0.9
OenobrandsFermvin3CMed0.9
OenobrandsFermvinA33High1.25
OenobrandsFermvinChampionMed0.9
OenobrandsFermvinMT48Low0.75
LallemandLalvin71B 1122Low0.75
LallemandLalvinBA11High1.25
LallemandLalvinBM 4X4High1.25
LallemandLalvinBM45High1.25
LallemandLalvinBourgoblanc CY3079High1.25
LallemandLalvinBourgorouge RC212Med0.9
LallemandLalvinBRL97Med0.9
LallemandLalvinCLow0.75
LallemandLalvinClosMed0.9
LallemandLalvinCross EvolutionLow0.75
LallemandLalvinDV10Low0.75
LallemandLalvinEC 1118Low0.75
LallemandLalvinICV D21Med0.9
LallemandLalvinICV D254Med0.9
LallemandLalvinICV D47Low0.75
LallemandLalvinICV D80High1.25
LallemandLalvinICV GREHigh1.25
LallemandLalvinICV OKAYLow0.75
LallemandLalvinICV OpaleMed0.9
LallemandLalvinK1 V1116Low0.75
LallemandLalvinL2226High1.25
LallemandLalvinQA23Low0.75
LallemandLalvinR2High1.25
LallemandLalvinRA17High1.25
LallemandLalvinRBS 133Med0.9
LallemandLalvinRhône 2056Med0.9
LallemandLalvinRhône 4600Low0.75
LallemandLalvinR-HSTMed0.9
LallemandLalvinSensyLow0.75
LallemandLalvinT73Low0.75
LallemandLalvinW15High1.25
LallemandLevulineBRGMed0.9
LallemandUvaferm43Low0.75
LallemandUvaferm43 RestartLow0.75
LallemandUvafermBCLow0.75
LallemandUvafermBDXMed0.9
LallemandUvafermSteinberger (DGI 228)Med0.9
LallemandUvafermSVGMed0.9
LallemandUvafermVRBMed0.9
LallemandVitilevure3001Med0.9
LallemandVitilevure58W3Med0.9
LallemandVitilevureElixirMed0.9
LallemandVitilevureMTMed0.9

Nutrient requirements for some other yeast strains not listed above are provided by Pambianchi, both in his book Techniques in Home Winemaking (2008) and online here.  The Pambianchi relative nutrient requirements scale appears to be somewhat different from that of Scott Labs, as shown in the table below for several Lalvin yeasts.  These differences should be taken into account when deciding on multipliers for other yeasts.

YeastNutrient Requirements
Scott LabsPambianchi
Lalvin 71B 1122LowNormal
Lalvin Bourgorouge RC212MedHigh
Lalvin EC 1118LowNormal
Lalvin ICV D47LowNormal
Lalvin K1 V1116LowVery Low

Yeast nutrient nitrogen contents are listed below.  This list includes only those nutrients which should be added directly to the fermenter, and does not include yeast rehydration nutrients.  Many of the listed nutrients contain DAP and/or thiamine.  The Alcohol and Tobacco Tax and Trade Bureau (TTB) sets the maximum legal addition rate for DAP at 8 lbs. per 1000 gals. (0.96 g/L), and for thiamine at 0.005 lb/1000 gals. (0.6 mg/L).  FermCalc does not enforce any limits, so it is up to the user to ensure that the nutrient additions comply with the limits set by the TTB and by the manufacturer.

ManufacturerNutrient% NitrogenData Source
VariousDiammonium Phosphate (DAP)21Scott Labs
LallemandFermaid A12Scott Labs
LallemandFermaid K10Scott Labs
LallemandFermaid O4Manufacturer, Scott Labs
OenobrandsMaxaferm8.5Manufacturer
OenobrandsNatuferm2.5Manufacturer
LallemandNutrient Vit End2.83Scott Labs
LaffortNutristart14Manufacturer
LaffortNutristart Org6.67Manufacturer
OenobrandsNutrivin15Email from manufacturer
OenobrandsNutrivin Super13Email from manufacturer
IOCPhosphate Titres21Scott Labs
LallemandSIY 333.33Scott Labs
Country WinesSuper Ferment6.53Email from manufacturer
BSGSuperferm8.33Manufacturer
BSGSuperfood10Manufacturer
LaffortThiazote21Manufacturer
BSGVinferm11.67Manufacturer

For more information about nutrient additions, see Travis Blount-Elliott's white paper.

Back to top

© 2007-2018 Steve Gross
Last updated 14 August 2018.