Dram — Alcohol dilution

MaxAnNa

In-app purchases

About this app

Dram works out the water needed to bring a spirit from one strength to another. By the glass
for tasting, by the litre for bottling.

THE ARITHMETIC IS RIGHT ON EVERY TIER

Water and alcohol do not add up: the mixture contracts. A simple ratio is therefore wrong,
and always wrong in the same direction.

One thousand millilitres at 63.5% brought down to 40%: the naive calculation asks for
587.5 ml of water and lands at 40.44%. The mass-balance calculation asks for 604.96, and
lands at 40.00%. On a bottling run, that is the difference between a label that is right and
a label that is not.

This correction is free, and it will stay free. The workflow is what is sold here, never the
accuracy of a figure.

TASTING — free

How much water opens a cask strength dram. Doses to a tenth of a millilitre, a graduated
syringe drawn on screen, a drop count below 2 ml, and a table of steps you can tap to compare
at a glance.

The other direction too: the water is already in, and the app tells you where the glass
landed.

BATCH — free

The same calculation by the litre, down to bottling strength, with the final volume, what
contraction costs you, and how many full bottles come out.

WORKSHOP — one-time purchase, no subscription

Hydrometer temperature correction using the official OIML R22 alcoholometric tables — the
ones customs and excise administrations work from.

This is the largest source of error in the craft. A batch reading 63.5% at 25 °C is really
61.78%: close to two points, far ahead of the contraction effect. It cannot be done in your
head, because it means inverting a fifty-four coefficient formula. Both soda-lime and
borosilicate hydrometers are supported.

The Workshop also adds a bottle library holding the dilution you keep for each one, blending
of up to five sources, reverse planning from a target batch, saved batches with notes, CSV
export, US units and proof.

The free tier still never shows a wrong figure: it takes the reading as given, and says
plainly that a measurement away from 20 °C must be corrected first.

WHAT THIS APP DOES NOT DO

No advertising. No account. No data collected, no data shared: everything is computed on the
device, offline, and even the CSV export never leaves the phone.

Twelve languages, light or dark theme, metric or US units.

Home distilling is regulated and, in several countries, prohibited. Dram calculates
dilutions; it does not teach distilling. Check what applies where you are.