On the Milk Log, enter the date, morning (AM) and evening (PM) litres, how much you sold, the price per litre and the buyer — co-op, hawker, hotel or home. The day's total litres and sale value fill in. On the Costs tab, log feed, vet, labour and transport. The Monthly Summary then rolls it all up: litres, litres sold, milk income, costs and the profit left, month by month and for the year.
Yellow cells are for typing; every total is a locked formula. Labels carry Swahili alongside English — Maziwa (milk), Mauzo (sales), Chakula (feed), Faida (profit) — so it reads at the shed. It opens in Excel, WPS or Google Sheets, so you can record each collection on your phone. The premium version adds a dashboard with the litres trend and average price per litre.