How Much Does a Homebrew Batch Actually Cost?

"Homebrewing is cheaper than buying beer" is one of the most repeated claims in the hobby, and it's only true if you're comparing grain and hops against a supermarket six-pack while ignoring everything else. Once you count equipment wear, gas, water, and the packaging that turns wort into drinkable beer, the real cost per litre is a lot closer to craft beer prices than most brewers expect — though still usually a saving.

The Components of a Batch's True Cost

Grain or Extract

An all-grain 5-gallon (19L) batch typically uses 4–6kg of base and speciality malt at £1.80–£2.60/kg, putting grain cost at £8–£15 per batch. Extract brewing is quicker but pricier per litre — a comparable batch using liquid malt extract runs £18–£28 in extract alone.

Hops

A hoppy pale ale or IPA can use 80–150g of hops per batch at £3.50–£6/100g for common varieties (more for trendy or single-origin hops), putting hops cost at £3–£9 per batch. A malt-forward style like a mild or brown ale might use a third of that.

Yeast

A liquid yeast smack-pack or vial runs £5–£8; dry yeast sachets are £3–£4.50 and, for most styles, perform just as well. Reusing a yeast cake from a previous batch (harvesting and repitching) can bring this close to zero — a real cost lever most new brewers don't use.

Gas, Water and Cleaning

A full brew day — mashing, boiling for 60–90 minutes, and often a hot sparge — uses a meaningful amount of gas or electricity, typically £3–£6 per batch depending on your setup and local energy prices. Water for mashing, sparging and cooling adds a small but real cost, and sanitiser/cleaning chemicals for equipment and bottles run £1–£2 per batch.

Packaging

Bottling a 19L batch into 500ml bottles needs roughly 38 bottle-fills. If you're buying new bottles, caps and labels rather than reusing, budget £0.15–£0.30 per bottle. Kegging avoids bottle cost per batch but carries a much higher upfront equipment cost that needs amortising across many batches to pay off.

Equipment Wear

Fermenters, airlocks, tubing, a hydrometer, and a capper all degrade or need periodic replacement. A modest home setup (£150–£350 all-in) amortised over 20–30 batches works out to roughly £0.20–£0.35 per litre.

Full Cost Breakdown — 19L (5-Gallon) All-Grain Batch

Cost Element	Session Beer / Mild	Hoppy IPA
Grain	£9.00	£13.00
Hops	£2.50	£7.50
Yeast	£4.00	£4.00
Gas & water	£4.00	£4.50
Cleaning & sanitiser	£1.50	£1.50
Bottles, caps & labels (38)	£7.60	£7.60
Equipment wear (amortised)	£5.00	£5.00
Total batch cost	£33.60	£43.10
Cost per 500ml bottle	£0.88	£1.13

At roughly £0.88–£1.13 per bottle, homebrewing a session beer or mild is meaningfully cheaper than most supermarket craft beer (typically £1.80–£2.80 per 500ml) — and an IPA still undercuts most taproom or bottle-shop prices for a comparable style. The savings shrink fast, though, if hops are expensive, batches are small, or bottles are bought new every time rather than reused.

Where the Real Savings (and Losses) Happen

• Reusing bottles cuts packaging cost by 80%+ — the main ongoing cost becomes caps and labels, not glass
• Harvesting yeast from a healthy fermentation for the next batch removes £3–£8 per batch
• Buying grain in bulk (25kg sacks vs pre-weighed kits) typically saves 25–35% on the largest single ingredient cost
• Failed or infected batches are the biggest hidden loss in the hobby — a contaminated batch means the full ingredient and gas cost with nothing to show for it. Tracking fermentation temperature and sanitation discipline protects the investment, not just the beer