The math

Mash bills: what's published, what's a guess

2 minute read · The Blending School

A mash bill is the grain recipe: the percentages of corn, rye, wheat, and malted barley the whiskey was made from. For a blend, it can be computed. The catch is the source data.

The state of the data

• Published. Some producers state exact recipes. Four Roses publishes its two mash bills and ten recipes. Maker's Mark, Woodford, and others disclose theirs. These are facts.
• Estimated. Many of the most famous whiskeys have never had an official recipe confirmed. Enthusiast consensus exists, built from interviews and archives, and it is often close, but it is an estimate and should be labeled as one.
• Unknown. Sourced whiskeys, some craft bottlings, and plenty of imports disclose nothing usable.

Blending mash bills

The blended mash bill is the same volume-weighted average as proof, run per grain. If 60 percent of your bottle is a 75/13/12 corn/rye/malt bourbon and 40 percent is a 95/5 rye, the blend's grain profile is computable in two lines. It is a genuinely interesting number: it tells you whether your bottle is quietly becoming a high-rye blend, and it often explains a flavor shift you noticed on the palate first.

The honesty rule

This is how Thief & Blend handles it: published data shown as fact, estimates marked with a tilde, unknowns excluded and counted in a coverage line. If any contributing pour is an estimate, the blended figure is an estimate too, and it says so. The goal is a bottle you understand, not a dashboard that flatters.

Does it change what you taste?

Directionally, yes. Rye reads as pepper, mint, and herbs; wheat reads as soft and bready; corn as sweetness; malt as body. Watch the blended bill move as you feed the bottle and you will start predicting the palate shift before you taste it. That feedback loop is one of the quiet pleasures of keeping records at all.