Household consumables restock calculator

Check what is running low before your next shop. Enter each supply in one consistent unit, then estimate how much to buy for the weeks ahead.

No account needed. Your entries stay in this page’s memory, are not sent anywhere, and disappear when you reload or leave. Download a CSV or print to keep your list.

Your supplies

Up to 20 items. Use non-negative numbers with at most 3 decimal places: stock and usage up to 1,000,000; coverage up to 520 weeks. Blank and negative values need correcting.

Your restock list

Quantities use the same unit as your inputs. Weeks remaining are estimates; fractional weeks are shown to 6 decimal places.

Your list is empty. Add an item to start a new calculation.

Correct this item’s inputs to show its result.

How the restock calculation works

Quantity to buy = max(0, weekly usage × coverage weeks − current stock). Weeks remaining = current stock ÷ weekly usage. Zero usage gives no depletion estimate and a purchase quantity of zero.

Example: 5 rolls in stock, 3 rolls used each week and 4 weeks of desired coverage means buying 7 rolls. Your existing stock lasts about 1.67 weeks. If you already have enough, the purchase quantity is zero.

Use rolls with rolls, litres with litres, or kilograms with kilograms. For liquids or bulk goods, turn off whole-unit rounding: stock 0.5 litres, usage 0.75 litres per week and 2 weeks of coverage means buying 1 litre. Pack sizes are not converted automatically.

This is a planning estimate based on steady average usage. It does not sync inventory, predict expiry, place orders or guarantee that supplies will last. Adjust for guests, travel and changing routines. CSV headings are in English.

Plan the cleaning tasks that use your supplies

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