Testing the Scale against Standards
A jeweler's scale with 0.01 oz resolution was used to measure beer serving weights. Scale accuracy was verified using a 16 fl oz (473 mL) pint can of macrobrewery beer (e.g., Narragansett Ale, final gravity [FG] = 1.011). The expected beer mass was calculated as 16 fl oz × 1.011 × 1.0432 oz/fl oz = 16.87 oz.
The full can was weighed and photographed for simple documentation. Its contents were then consumed, and the empty can shaken vigorously to remove residual liquid, followed by reweighing and photographing for documentation. The beer mass was determined by subtracting the empty can weight from the full can weight. Measurements within 2% (±0.34 oz) of 16.87 oz were deemed acceptable; discrepant results prompted retesting with a second can or substitution with an alternative scale. Verified scales proceeded to data collection.
Measuring a Pour at the Bar
Beer pours were measured at bars using a portable jeweler's scale (0.01 oz resolution, kept out of view). Upon seating at the bar stool, a pint (or specified volume) serving of beer was ordered. Upon delivery, if the pour appeared visually short, the bartender was asked for reassurance that it was a normal pour or if it could be topped off, requesting a full pour without debate.
Before consuming or spilling any beer, the scale was retrieved from storage, set up, tared to zero in ounces, and the vessel with the full pour placed upon it for immediate weighing. The beer on the scale was photographed for documentation, capturing the vessel shape, beer volume/height, and scale reading as the focal point. The beer was then fully consumed to the last drop, after which the empty vessel was reweighed using the identical setup and photographed for documentation. The beer mass was calculated by subtracting the empty vessel weight from the full pour weight. A single pour sufficed for conclusion, as the bartender was afforded full opportunity for an honest, maximum-volume pour; deviations exceeding 2% from expected mass prompted sample exclusion.
Calculating the Volume of a Pour
Beer volume was calculated from the measured mass (full vessel weight minus empty vessel weight, in oz) using the final gravity (FG) and expected mass per 16 fl oz. If the FG was published (expressed as 1.0XX, relative to water at 1.000), it was used directly. Absent published FG, it was estimated by doubling the alcohol by volume (ABV) percentage to form the hundredths and thousandths: e.g., 4.2% ABV → 1.008; 5.5% ABV → 1.011; 6.9% ABV → 1.014 (practical approximation from homebrewing heuristics).
The pour fraction (measured volume relative to the claimed volume) was computed as:
This normalizes for post-fermentation density (FG only), yielding the effective volume delivered as a proportion of the ordered pour. Deviations below 0.95 (5% short) were flagged for analysis.
Study Parameters
Data was collected between November 2025 and March 2026 across three metropolitan areas: Greater Boston (Massachusetts), the Twin Cities (Minnesota), and Denver (Colorado). A total of 63 measurements were taken at 49 unique venues. Of these, 59 were scale-based measurements with full mass data, and 4 were observation-only entries documenting glass shape and venue practices without scale readings.
Venues included brewpubs, taprooms, craft breweries, neighborhood bars, and restaurants. No venue was informed in advance of the study. All measurements represent standard consumer transactions—the researcher ordered as any customer would, paid the listed price, and measured what was delivered.
Glass shapes were documented for each pour using a standardized taxonomy of 18 vessel types, ranging from the ubiquitous shaker pint to goblets, steins, and specialty glassware. Claimed volumes ranged from 4 oz samplers to 20 oz "imperial pints," with the 16 oz American pint being the most frequently ordered size.