Calculators / Beers Per Beer

Beers Per Beer

Slide a pour and watch it convert to standard beers in real time. Log what you actually drink and it sketches your blood alcohol curve for the rest of the night. Everything stays in your browser.

1 · The pour

updates as you drag
Volume (oz)driving12.0 oz
Volume (mL)355 mL
ABV4.2%
1.00
standard beers

A standard beer here is 12 oz / 355 mL at 4.2% ABV.

2 · Drink it

1.00 beers · 4.2%
When—

Right is now, left is 8 hours back — backfill what you missed.

Body weight185 lb84 kg

3 · Right now

Reading the clock…

4 · Tonight’s log

Empty. Nothing saved in this browser.

Saved in this browser under bpb-night-v1 — same idea as a cookie, but it uses local storage instead, so it stays on your device rather than riding along with every request, and it holds far more. No server, no account, nothing leaves your phone. Close the tab and come back later and the night is still here; drinks older than 24 hours are dropped when the page loads. Clearing it above deletes the entry outright.

⚠

Do not trust this number. It is a Widmark estimate from a slider, not a breathalyzer. Food, sleep, medication, hydration, genetics, how fast you drank, and plain measurement error move real BAC well outside anything modelled here. It is not legal advice, not a defense, and never a reason to decide you are fine to drive. If you have been drinking, get a ride.

Widmark (1932) with first-order absorption (τ = 15 min) and zero-order elimination at 0.015%/hour. The r in the build dropdown is the share of you that acts like water and dilutes the alcohol — more lean mass, lower BAC from the same drink. Individual elimination rates run roughly 0.010–0.020%/hour, so the tail of that curve could be hours off in either direction. Entertainment only — when it matters, don’t drive.