Kefir Calculator

Setup

Kitchen temperature

Jar capacity

caps the pour and flags surplus grains

ml

Timing calibration

Pour

–

ml of milk

Ready around

Grains today

g

Grain-to-milk ratio

Grain weight

Log

Ratios are ml of milk per gram of grains. Ferment estimates start from a rule of thumb worth about two observations and are re-fitted from your harvest times — “under” pulls them longer, “over” shorter, “just right” anchors them where you harvested. Everything is stored in this browser only. Two things leave it: asking for a reminder sends a notification token and a time, and logging a harvest adds one to the public counter above. Neither carries anything about the batch, and the counter keeps no record of who you are.