When your product is not a unit: choosing what to cost before costing anything
Construction, transport, extraction, utilities and agriculture have no discrete product to cost. How to choose a workable unit of measure — and a plain account of where this tool does not yet serve you.
Every other guide here starts from a question your industry cannot answer: **what does one product cost?**
You do not make a product. You complete a project, run a trip, pump a volume, harvest a season. If you have tried a costing sheet and found it did not fit your work, nothing is wrong with you — the template was written for a different shape of business.
This guide does two things: helps you pick a unit that works, and states plainly where this tool does **not** yet serve you, so you do not spend an afternoon finding out.
Why the unit decides everything after
A cost figure means nothing without "per what". A large number is large or small depending on whether it is per project, per month, or per thousand tonnes.
And here is the part that matters: **an improvement can only be proved if the unit stays the same before and after.** Compare a big project with a small one and the numbers differ because of scale, not because anyone got better.
Four shapes — find the one that matches you
1. One project
Construction, installation, infrastructure, design services, contract maintenance.
| Unit to use | When | The trap |
|---|---|---|
| A repeating element | The project divides into like parts — an apartment, a span, a station | Best option: it compares across projects |
| A unit of work quantity | You have norms per square meter, linear meter, cubic meter | State exactly what scope is included, or two sheets will not compare |
| The whole project | Genuinely one of a kind | Only comparable with itself over time, never with anyone else |
2. One trip, or one service delivered
Freight, passenger transport, rail, marine, air, warehousing.
Workable units: **one trip on a defined lane**, **one tonne-kilometre**, or **one cubic meter of storage per month**.
The trap here is empty running and unsold space. A trip costs nearly the same full or half-empty, so cost per tonne swings hard with **load factor**. Leave that out and two sheets from the same company will not agree with each other.
3. One unit of continuous output
Mining, oil and gas, power, water, environmental services, renewable generation.
Use the unit you already sell in: a tonne, a cubic meter, a unit of energy.
This shape actually fits the tool better than the other three, because output is measured and cost divides cleanly. Two cautions:
- Output quality varies — a tonne of high-grade ore is not comparable with a tonne of low-grade. Normalize to a common basis, the way the tobacco guide normalizes to dry weight.
- Most cost here runs with TIME rather than with output, so unit cost depends heavily on the period's production volume. Record which period.
4. One production cycle
Crops, livestock, forestry, aquaculture.
Use **one unit of output harvested** — a tonne, an animal, a cubic meter of timber — not one unit of area.
Cost per hectare says nothing if yield changes, and yield is exactly what every improvement in this sector targets. Divide by output and the improvement appears; divide by area and it vanishes.
Six fields work unchanged
Once the unit is chosen, most of the ten-category template runs normally — just read "one product" as "one unit you selected":
| Category | Read it as |
|---|---|
| Material | Consumables per unit — fuel, construction materials, seed, feed, chemicals |
| Machine time | Equipment hours per unit — vehicles, plant, pumps, vessels |
| Labor | Person-hours per unit |
| Tooling | Wearing items, divided by units produced between replacements |
| Outside processing | Subcontractors, hired plant with operator, bought-in transport |
| Overhead | Standing costs that accrue with time, divided by the period's own output |
The remaining four — scrap, rework, packaging, freight — apply in some of these industries and not others. Where they do not apply, **enter zero**: zero means considered and none, blank means nobody knows.
Plainly: where this tool does not serve you yet
Three limitations are real and there is no trick around them. Knowing them now lets you decide whether to invest the time.
- There is no unit-of-measure field. You choose a unit in your head and record it in the notes; the system cannot stop two sheets with different units being compared.
- Benchmarking groups by industry and country, not by unit of measure. So within this group your sheet may sit beside one using a different unit. Read the notes before trusting a comparison.
- Time-based costs have no home. Capital tied up, retention held pending acceptance, a season's costs carried before harvest — record them in the notes rather than forcing them into a field.
What still works regardless
Even where the template fits imperfectly, three things function fully — and they are the three a spreadsheet cannot do:
- Revision history — who changed which figure, when, and why.
- Counterpart verification — a second party attesting the number is real. This does not depend on your unit of measure at all, and it is what makes a cost figure trustworthy to anyone outside your company.
- One shared formula, so everyone in the business calculates the same way instead of each keeping their own file.
So the sensible way to use this, in these industries, is: choose one unit, hold it steady, and build your own history first. Comparison with other operations comes later — and it only becomes meaningful when enough people in your sector have settled on the same unit.
Related guides
- Is the saving real? Bottlenecks, and the three ways a number becomes money
Why speeding up a machine usually saves nothing, when a number on a costing sheet turns into cash, and how to tell real cash savings apart from cost avoidance before anyone in finance asks.
- Six fields almost nobody fills in, and which way each one bends the cost
Material yield, personal and machine allowances, energy, units per pack and fixed cost per lot: six inputs that are usually left empty, and why five of the six make the cost look cheaper than it is.