Work out what you need
Shopping & Household
Calculate quantities, understand the method and turn the result into a practical buying plan.
Calculators
Unit Price & Offers
Compare equivalent quantities across pack sizes, bulk purchases and multibuy offers without mixing incompatible units.
Use calculator →02Discount Calculator
Calculate savings and final price, including an optional second discount.
Use calculator →03Household Supply Planner
Plan detergent, dishwasher tablets, coffee pods and toilet paper from your actual consumption, stock and pack sizes.
Use calculator →04Pet Food Supply Calculator
Estimate pet food for a chosen number of animals and days, then round to whole bags.
Use calculator →Practical guides
Guide
How to Compare Unit Prices
Compare packs by price per kilogram, litre or item: how to convert to one base unit, a worked example, and what unit prices do not tell you.
Read guide →Guide
Bulk Buying: When Does It Save Money?
When a larger pack actually saves money: compare unit prices first, then usable quantity, storage and cash tied up.
Read guide →Guide
Understanding Supermarket Discounts
Work out percentage, sequential and multi-buy discounts correctly: why 20% then 10% is 28%, and what “3 for 2” saves per item.
Read guide →