Household refill unit-price worksheet

Compare two refill or household packs using the same quantity unit and cost scope. Record the full usable quantity in each pack, then enter the costs you want to compare on a consistent basis. This makes a larger pack’s unit price visible without assuming that buying more is automatically the better choice.

Choose a comparison quantity such as one litre, one kilogram or one item, and use that same unit for both packs. Keep product concentration, compatibility and intended use in the notes. Where products are not equivalent, the arithmetic is a price-per-quantity comparison rather than proof that they provide the same number of uses.

All shopping tools

This tool does not save your entries automatically. Download a copy to keep your work, and clear the worksheet on a shared device before leaving. Do not enter passwords, account numbers or other sensitive personal information.

Set a common basis

Convert both pack quantities to the same unit before entering them.

Common unit

Other unit and conversion basis, if used

Quantity to show the price for, in that unit

For example enter 1 when comparing cost per one chosen unit.

Cost basis

Enter two pack observations

Record usable contents on the same basis; do not mix gross packaging weight with contents.

First pack and exact variant

First pack cost on the chosen basis, GBP

First pack usable quantity in the common unit

Second pack and exact variant

Second pack cost on the chosen basis, GBP

Second pack usable quantity in the common unit

Keep the comparison conditions

Unit price does not by itself establish equivalent use or suitability.

Exact sources, check dates and stated quantities

Concentration, refill compatibility or use differences

Amount you expect to use and storage constraints

Using your worksheet

Choose one quantity unit and convert both observations before calculating.
Use item-only costs for both packs or comparable delivered costs for both; do not mix the two.
If concentrations or uses differ, keep that limitation visible instead of claiming equivalent value.
Consider the amount you expect to use before choosing the larger pack.

Assumptions and limits

The calculation compares price per entered quantity, not performance, safety or cost per use.

No conversion between concentration levels or different product functions is performed.

Every pack quantity and price is supplied by the user.