Distillation cuts refer to separating the distillate into distinct fractions — foreshots, heads, hearts, and tails — based on boiling points and sensory characteristics. Proper cuts are essential for producing safe, high-quality spirits. The hearts are the desirable ethanol-rich fraction that becomes your finished product. Heads contain harsh, solvent-like compounds (ethyl acetate, acetone), while tails carry heavier fusel oils that taste unpleasant. Making clean cuts separates a rough distillate from a refined spirit.

The transition from heads to hearts is best detected by smell and taste, not by temperature alone. Heads have a sharp, solvent-like aroma (nail polish remover / glue). When that harsh note fades and the distillate smells clean with a slightly sweet ethanol character, you're entering hearts. Experienced distillers often collect in small numbered jars and evaluate them the next day. A common guideline: heads typically account for the first 15–25% of the total expected alcohol yield in a pot still, and 10–18% in a reflux still.

Foreshots are the very first vapors to condense, rich in methanol, acetone, and other low-boiling-point compounds. They are always discarded — never consumed or re-distilled into a drinking spirit. Foreshots typically represent about 1–4% of total expected alcohol. Heads come next and, while still unpleasant, can be collected and added to future stripping runs for re-distillation. Many home distillers combine foreshots with heads for simplicity. This tool allows you to separate them for more precise planning.

Still type dramatically affects cut proportions. Pot stills produce a wider spread of congeners, resulting in larger heads and tails fractions (hearts ~35–45% of total). Reflux stills provide better separation, compressing heads and tails, yielding larger hearts (~50–65%). Fractionating columns offer the sharpest separation, with hearts often exceeding 65% of total output. Hybrid stills (pot + reflux) fall between pot and reflux ranges depending on how much reflux is applied during the run.

Yes! This is common practice among both hobby and professional distillers. Heads and tails from a spirit run can be added to the next stripping run or combined into a dedicated "feints run." Over multiple cycles, some of the ethanol trapped in heads and tails is recovered. However, foreshots should always be discarded due to their high concentration of harmful compounds. Never add foreshots back into any run intended for consumption.

Typical ABV ranges vary by still type: Pot still heads exit at ~78–84% ABV, hearts at ~68–76%, and tails from ~55% down to ~20% where most stop collecting. Reflux stills produce heads at ~82–90%, hearts at ~78–86%, and tails from ~60% down. Column stills can maintain hearts at 90%+ ABV throughout most of the run. Use a parrot with an alcoholmeter to monitor ABV continuously during your run — a dropping ABV is a key signal that tails are approaching.

Vapor temperature at the top of the still gives a rough indication of where you are in the run. Pure ethanol boils at 78.3°C (173°F), but in practice heads start coming off around 65–78°C, hearts stabilize around 78–82°C, and tails begin as the temperature climbs above 82–84°C. However, temperature alone is unreliable — it's affected by ambient pressure, still design, and wash composition. Always pair temperature readings with sensory evaluation (smell, taste, feel) for accurate cuts.

This estimator uses empirical models based on typical distillation behavior for each still type and cut style. It provides a reliable planning estimate (±10–15% margin). Actual results vary based on: wash composition (grain vs. sugar vs. fruit), fermentation quality, heating rate, ambient conditions, and your personal sensory preferences. Treat these numbers as a starting guide — your nose and palate are the ultimate judges. Over multiple runs, you'll develop intuition for your specific equipment.

Conservative cuts narrow the hearts fraction, discarding more at the heads-to-hearts and hearts-to-tails transitions. This yields a cleaner, smoother spirit but with lower overall volume — ideal for a neutral vodka or a delicate gin base. Generous cuts widen the hearts window, capturing more volume at the expense of potentially including faint heads or early tails notes. This is common for flavorful spirits like whiskey or rum, where slight congeners add character. Standard sits in the middle and is recommended for beginners.

The most frequent mistakes: 1) Relying solely on temperature or ABV readings without smelling/tasting each jar. 2) Being too greedy — including heads for more volume, which leads to hangover-inducing spirits. 3) Cutting to tails too early out of fear, leaving good ethanol behind. 4) Not collecting in small enough jars (large jars blur the transitions). 5) Evaluating cuts immediately during the run when senses are fatigued — always re-evaluate the next day. 6) Forgetting to discard foreshots separately from usable heads/feints.