How to make parmesan at home: yield, doses & aging
Parmesan runs about a 8.5–9.5% yield of milk weight and is aged at 10–13°C (50–55.4°F). Here are the make doses for a 2-gallon batch and the aging targets — every number cited to the source, not guessed.
How much parmesan does a batch make?
Parmesan yields 8.5–9.5% of the milk weight (midpoint 9%). Whole cow milk weighs about 1 kg per litre, so a 2-gallon (7.6 L) batch gives roughly 664–742 g of parmesan (about 703 g at the midpoint). Richer milk — raw, Jersey, or cream-topped — lands at the high end.
For a tighter estimate on a hard cheese like parmesan, the Van Slyke formula uses your milk’s fat and casein against a cheese-moisture fraction of about 0.31 — Curd runs this for you from a milk test.
Rennet, culture & calcium chloride for parmesan
For the 2-gallon batch above:
| Ingredient | Dose for a 2-gallon batch |
|---|---|
| Rennet (single-strength liquid) | 0.5 tsp (2.5 mL) |
| Calcium chloride (30% solution) | 0.5 tsp (2.5 mL) for pasteurized/store milk (skip for raw milk) |
| Bulk / direct-set culture | about 0.5 tsp (2.5 mL), or scale a measured DVI packet to the batch |
Double-strength liquid rennet uses half the volume. Too much calcium chloride (above ~½ tsp/gal) turns the curd bitter and rubbery — stay at the dose above.
Aging parmesan
Age parmesan at 10–13°C (50–55.4°F) at 80–85% humidity. It’s ready in about 10 months at the earliest — longer deepens the flavour. Flip the wheel every 7 days so it drains and dries evenly.
FAQ
How much parmesan does a gallon of milk make?
Parmesan yields 8.5–9.5% of milk weight, so a gallon of whole milk (~3.9 kg) makes roughly 332–371 g. Richer milk yields more.
How much rennet and calcium chloride for parmesan?
For a 2-gallon batch: 0.5 tsp (2.5 mL) single-strength liquid rennet and 0.5 tsp (2.5 mL) of 30% calcium chloride (only for pasteurized milk).
What temperature do you age parmesan at?
10–13°C (50–55.4°F) at 80–85% humidity, ready in about 10 months at the earliest.
What you need to make Parmesan
Consistent cheese comes from measured doses and a steady aging temperature — eyeballing rennet or the cave is how batches turn rubbery or slip their moisture.
- Set the curd with single-strength liquid rennet — the 0.5 tsp (2.5 mL) dose above is measured, not eyeballed.
- Store or pasteurized milk needs calcium chloride to firm the curd — 0.5 tsp (2.5 mL) for this batch.
- A direct-set cheese culture sets the acidity — match the culture type to parmesan.
- Hold the cave band with a thermometer/hygrometer so parmesan ages at its target temperature and humidity.
- Drain and shape in cheese molds and a press.
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Sources
Yield bands and aging targets are the cited published values for Parmesan; every milk, make and cave varies, so treat the doses as a tested starting point and adjust to your own results. Yield depends heavily on milk fat and casein — raw or Jersey milk yields more than store milk.