Free guide
Ingredients Approach to Costing: Step by Step
A practical walk-through of bottom-up (ingredients) costing — from mapping activities and inputs to valuing staff time, commodities and capital and calculating a unit cost.
PDFUpdated 30 September 2026Costing
What's inside
- When to use the ingredients approach, and when a top-down approach is enough
- Mapping activities and the inputs each one uses
- Measuring quantities, including staff time
- Choosing unit prices and adjusting them to one currency and price year
- Annualising capital items and allocating shared inputs
- A worked structure you can copy into the free costing template
Key points
- 01Start from a list of activities, then list the inputs each activity uses.
- 02Staff time is usually the largest and least certain input; measure it carefully.
- 03Every quantity and price needs a documented source.
- 04Present the unit cost with its breakdown, not as a single number.
Frequently asked questions
What is the ingredients approach?
A bottom-up costing method that lists every input used to deliver a service, measures the quantity of each and multiplies it by its unit price, then sums the results.
Is the ingredients approach better than top-down costing?
It shows how a cost is built up and what drives it, which is useful for planning and scale-up, but it needs more data. Many studies combine both approaches and compare the results.
How do I measure staff time?
Through time-and-motion observation, staff interviews or time sheets. Report the method, because estimates of staff time often drive the result.
Need this done properly?
This guide explains the method. If you would rather have the analysis done for you — with local data, independent quality control and a report you can defend — we can help.
Need this done properly?
Tell us about the decision you need to support. We will propose a scope, timeline and price.