Free tools for winemakers
Additive dose calculator
Rate × volume for anything you add
Add
Type the volume you are treating.
Type the rate from your product's instructions — for example, bentonite is often given in g/hL.
How do we calculate this?
The exact formulas used in this tab:
Units
What this calculator does
Works out how much of an additive to add from its dose rate and the volume you are treating.
- For example, bentonite or tannin in g/hL, or a liquid product in mL/hL.
- A rate by weight gives an amount by weight; a rate by volume gives a volume.
The formula
Dose = rate × volumeg/hL → grams = rate × volume L ÷ 100ppm = mg/L, so 1 ppm over 1,000 L = 1 gmL/hL → millilitres = rate × volume L ÷ 100
Worked example
- Rate: 50 g/hL
- Volume: 1,000 L
- Volume in hectoliters 1,000 ÷ 100 = 10 hL
- How much to add 50 × 10 = 500 g
Add 500 g of the product
Questions
Which rate unit should I use?
The one in your product’s instructions. g/hL, ppm and mg/L are weights per volume and give an amount in grams. mL/hL and mL/L are volumes per volume and give milliliters. The calculator doesn’t convert between weight and volume, because that depends on the product.
What’s the difference between g/hL and ppm?
1 g/hL is 10 mg/L, which is 10 ppm. So 50 g/hL is the same as 500 ppm.
Does the calculator suggest how much to add?
No. Rates differ by product and by wine, so it only turns the rate you choose into an amount. Follow your product’s instructions, and run a bench trial for fining agents such as bentonite.
Guides that use this calculator
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Crystals in wine: what they are and how to prevent them
Crystals in wine are tartrate (KHT), not glass, and harmless. Prevent them by cold stabilizing: 1–3 weeks near 0 °C, or seed 4 g/L KHT for 4 hours.
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How much bentonite? Protein stability in white and rosé wine
White and rosé wines usually need 10–100 g/hL of bentonite, but only a bench trial and an 80 °C heat test tell you how much. Run one, then scale up.