When would I blend beers?

Common blending scenarios include: mixing old and young lambics for gueuze, blending sour and clean beers for fruit sours, adjusting ABV or flavour, and creating cask blends for real ale.

Can I blend worts before fermentation?

Yes, blending worts (parti-gyle brewing) is a traditional technique. Blend first runnings with second runnings to create a specific gravity, or split runnings into separate beers of different strengths.

How accurate is the ABV blending calculation?

The volume-weighted average ABV is accurate for beers with similar final gravities. For very different beers (e.g. blending a 12% barley wine with a 3% mild), the result is approximate but useful for planning.

Why would I blend two beers?

Blending allows you to adjust gravity, colour, bitterness, or flavour after fermentation. Common uses include diluting a strong beer, blending a sour with a clean beer for balance, or combining two batches to create a unique flavour profile.

Can I blend different beer styles?

Yes, creative blending can produce excellent results. Classic examples include blending old and young lambics for gueuze, blending mild and strong ales for best bitter, or adding a small amount of stout to a porter for added complexity.

BrewCalcs

Blending Calculator — Recipe Design

Calculate blending ratios and resulting gravity when mixing two beers.

Beer / Wort 1

Volume

Gravity (FG)

ABV

Beer / Wort 2

Volume

Gravity (FG)

ABV

How We Calculate This

Blending Gravity

Gravity points are additive: Blended GP = (V1 x GP1 + V2 x GP2) / (V1 + V2). This gives the volume-weighted average gravity of the blend.

Blending ABV

ABV blends similarly: Blended ABV = (V1 x ABV1 + V2 x ABV2) / (V1 + V2). This is the volume-weighted average alcohol content of the resulting blend.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify values and adjust based on your equipment and ingredients.