Calculators
Link  Description 

Equation Details  Not a calculator but describes the calculators and their equations 
Pot Still Purity  For Pot stills: Calculate start up time and collection rate/time for a volume of wash and given heat source. 
Pot Calc (v2)  Not currently working  For Pot stills: Calculate start up time and collection rate/time for a volume of wash and given heat source. 
Reflux Still Sizing & Purity  For Relux stills: Calculate start up time and collection rate/time for a volume of wash and given heat source. Includes variations for different packing types. 
EtOH Temp Conv Calc  Not currently working  Correct ABV calculations for temp when using a spirit hydrometer. 
HETP Calc  Height Equivalent of Theoretical Plate (HETP) for packed columns. Includes variations for different packing types. Good to understand max ABV achievable from a still. 
Reflux Heat and Mass Balance  Lets you model the heat and mass balances around a typical 4 plate column. For understanding how to create equilibrium. 
Condenser Size  Calculate the size of condenser for a given heat source. Good for building your still. 
Product Dilute Calc  Dilution calculator. Useful when diluting your product to drinking strength. 
Calcs from Rad14701  A collection of calculators develop by user Rad:

Acidity Calc  Calculate the amount of citric acid to get desired pH for mashing 
Alcohol Content Calc  Calculate the ABV% of your wash using the Specific Gravity 
Alcohol Yield Calc  Calculate expected alcohol yield from a given amount of sugar in a sugar wash 
Specific Gravity of sugar Wash  Input how much sugar to get an expected ABV 
Physical Properties  Collection of EthanolWater physical properties

Unit Conversion Calculations  Convert Unit of measure to or from Metric and Imperial

Blood Alcohol Content  Calculate your Blood Alcohol Content based on your gender, weight, and amount consumed 
For professional level calculators you can use AlcoDens here: AlcoDens
For refractometers you need a different calc: Refractometer Calculators
Distillique's Calculators: Distillique Calcs (Includes mashing, fermenting, distilling, dilution and unit conversion]
Still Dragon Calculators: SD's Calculators