Source-Owned Tinseth Kettle-Addition Estimate. Reproduce a retained recipe's kettle-boil Tinseth estimate with exact unit normalization, per-addition provenance, and optional measured-BU comparison.
Specialist tool for Brewing1 documented formula1 guided projectPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
One retained recipe identity/revision/scope, estimate timestamp, documented final volume with explicit liter or U.S.-gallon unit, documented boil gravity, 1–50 pipe-delimited kettle-addition rows with unique label/source lot/mass/explicit gram or avoirdupois-ounce unit/alpha-acid percent/positive whole boil minutes, exact recipe document provenance, optional complete measured-BU method/report tuple, reviewer, retention note, and six source/measurement/decision boundaries
Output to expect
Per-addition normalized grams, alpha-acid mass and mg/L, bigness/boil-time/utilization factors, estimated contribution, summed Tinseth estimate, optional signed measured-minus-estimated BU difference, six nondecisions, legacy estimatedIbu compatibility, and source-owned-tinseth-kettle-addition-estimate/v1 Project output
How it works
Normalize mass and final volume once with NIST factors, calculate Tinseth bigness from the documented boil gravity and a separate exponential time factor for each source-recorded kettle addition, multiply each row's alpha-acid mg/L by utilization, retain full precision, then sum without style bands, sensory labels or hidden defaults
Every row must belong to the same retained recipe revision and final-volume/gravity scope; dry-hop, whirlpool, non-boil, missing-lot, inferred-unit, missing-alpha or Tool-invented additions are refused.
Estimated IBU is not ASBC laboratory BU, perceived bitterness, recipe/style/process advice, fermentation or packaging verification, release or consumption approval, legal/label compliance, or health/safety advice; an optional report residual is arithmetic only.
Choose your path
Built around the job you need to finish
Reproduce one retained source-owned recipe's kettle-boil additions with the Tinseth model, full source and reviewer provenance, and an optional exact laboratory-BU report comparison while refusing sensory, recipe, process, release, consumption, legal, health and safety decisions.
Recipe-record owner reproducing a multi-addition schedule
Recalculate one retained recipe revision without hidden defaults, style labels or invented additions.
Fix the recipe identifier, final-volume basis and documented boil gravity; transcribe every unique kettle-addition label, source lot, mass/unit, alpha-acid percentage and boil time; inspect each contribution and export the v1 record.
Can trace the summed estimate to every source row and exact NIST conversion while recipe selection and process changes remain with accountable owners.
Quality or laboratory reviewer comparing one exact report
Record the arithmetic difference between a Tinseth estimate and one identified measured-BU result without treating the difference as proof of model accuracy.
Enter the complete optional measured value, method code, report owner, report identifier/locator and report date; retain the signed measured-minus-estimated difference and all measurement boundaries.
Gets a reproducible comparison record that never certifies the laboratory, equates methods, predicts taste or approves release.
Auditor using a phone to reject incomplete recipe evidence
Exercise unit normalization, row grammar, source completeness, stale locking and portable exports without receiving brewing or alcohol advice.
Load the de-identified example, test grams and avoirdupois ounces plus liters and U.S. gallons, trigger row/date/optional-tuple/boundary errors, modify a successful record, inspect page-session snapshots and clear them.
Can reject ambiguous records and retain a source-owned estimate without mistaking simulated acceptance paths for sensory research, laboratory accreditation or safety approval.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Retain the recipe identifier and revision, estimate timestamp, final-volume basis, documented boil gravity, recipe owner, exact document locator, source review date, responsible reviewer, and every source lot. Mixed revisions, inferred units, draft schedules, and Tool-created rows are refused.
One record = one recipe revision + one final-volume/gravity scope
Reproduce each Tinseth contribution
Normalize grams or avoirdupois ounces and liters or U.S. liquid gallons with disclosed NIST factors. For each unique kettle-boil row, multiply source alpha-acid milligrams per liter by the shared bigness factor and its own exponential boil-time factor, retain full precision, and then sum.
Σ[(AA decimal × hop g × 1000 ÷ final L) × 1.65 × 0.000125^(gravity−1) × (1−e^(−0.04×minutes)) ÷ 4.15]
Keep estimate, laboratory BU, and sensory response separate
An optional measured-BU value is accepted only with its complete method code, report owner, report identifier/locator, and report date. The Tool reports measured minus estimated as signed arithmetic; it does not certify the laboratory, explain the difference, predict taste, or approve a batch.
Report residual = measured BU − summed Tinseth estimate
Updated: September 2026
Example Scenarios
Transcribe each kettle-addition label, source lot, mass, explicit unit, alpha-acid percentage, and whole boil minutes from one retained recipe. Inspect the row contributions and export the v1 record without receiving a recipe change or style recommendation.
Reproduce the same retained inputs using avoirdupois ounces and U.S. liquid gallons or grams and liters. Confirm normalized values and reject bare ounce, Imperial-gallon, volume-for-mass, inferred-unit, or mixed-scope records.
Add one complete measured-BU report tuple and retain the signed difference from the model estimate. Route method suitability, sampling, uncertainty, sensory interpretation, recipe action, release, and compliance to accountable reviewers.
Common Mistakes to Avoid
✕
Using hidden defaults or mixing recipe revisions, volume bases, gravity records, and source lots
✓
Stop and retain one exact recipe revision and scope. Enter every required field and explicit unit from accountable sources; the Tool will not fill gaps or merge records.
✕
Treating estimated IBU as measured BU, perceived bitterness, style fit, or approval
✓
Keep model, laboratory, sensory, recipe, release, consumption, legal, health, and safety evidence separate. Use this output only as a retained arithmetic record.
FAQ
No. It is a reproduction of the Tinseth recipe model from entered source records. ASBC Beer-23 methods are laboratory measurement contexts. Keep the estimate and any reported laboratory value separately labeled.
No. This bounded workflow accepts source-recorded kettle-boil additions with positive whole boil minutes. It refuses non-boil and unknown processes instead of inventing a utilization model.
Enter only the documented boil gravity owned by the retained recipe/model record. The Tool does not choose, estimate, correct, or validate a gravity value and refuses a mixed or unknown scope.
It is only the signed arithmetic difference between one complete reported laboratory tuple and the reproduced model estimate. It does not diagnose the cause, rank methods, certify accuracy, or predict sensory response.
No. Style, ingredients, process, fermentation, packaging, release, labeling, legality, consumption, health, emergency, and safety decisions remain with current sources and accountable people.
About Source-Owned Tinseth Kettle-Addition Estimate
Reproduce one retained recipe revision from explicit kettle-boil addition rows, a documented final-volume basis, and a documented boil gravity. The result is a Tinseth model estimate—not laboratory measurement, perceived bitterness, a style target, brewing instruction, product approval, or alcohol and safety advice.
