Cradle-to-gate is one of the most common system boundaries used in life cycle assessment, and also one of the most misunderstood. If you have ever read a product’s carbon figure and wondered exactly what it does and does not include, the boundary is usually the answer. This guide explains what cradle-to-gate means, what it covers, how it differs from cradle-to-grave and gate-to-gate, and when it is the right choice for your assessment.
What does cradle-to-gate mean?
Cradle-to-gate is a life cycle assessment boundary that measures the environmental impact of a product from raw material extraction up to the point it leaves the factory gate. The “cradle” is the earth, where raw materials begin. The “gate” is the factory exit, the moment the finished product is ready to ship.
Everything in between is counted: mining or harvesting raw materials, transporting them to the plant, and every process used to turn them into a finished product. What happens after the gate, distribution to retailers, the use phase, and end-of-life disposal, is deliberately left out. A cradle-to-gate study answers a focused question: what was the environmental cost of making this product, before it was ever sold?
What is included in a cradle-to-gate assessment?
A cradle-to-gate boundary typically covers three life cycle stages:
- Raw material extraction. Mining metals, drilling for fossil-based inputs, harvesting crops or timber, and the energy and emissions tied to those activities.
- Inbound transport. Moving raw materials and components from their source to the manufacturing site.
- Manufacturing. Every process inside the factory: energy use, water, process emissions, waste treatment, and the production of any sub-components.
It does not include outbound logistics to customers, the energy or resources consumed while the product is used, or what happens when the product is thrown away or recycled. Those belong to wider boundaries.
Cradle-to-gate vs cradle-to-grave vs gate-to-gate
The three boundaries differ only in where they start and stop. Picking the right one is the single most important decision in scoping an LCA, because it decides what gets counted.
| Boundary | Starts at | Ends at | Best for |
| Gate-to-gate | Factory entrance | Factory exit | Measuring a single production step or process |
| Cradle-to-gate | Raw material extraction | Factory exit | Product carbon footprints, EPDs, supplier comparisons |
| Cradle-to-grave | Raw material extraction | End-of-life disposal | Full product footprint including use and disposal |
Gate-to-gate is the narrowest. It looks only at what happens inside one facility, useful when you want to isolate the impact of a single manufacturing step, as covered in our guide to gate-to-gate life cycle assessment. Cradle-to-gate widens the lens back to raw materials. Cradle-to-grave is the full picture, extraction all the way through to disposal. A cradle-to-gate study can be thought of as a cradle-to-grave study with the use and end-of-life stages removed.
When should you use a cradle-to-gate boundary?
Cradle-to-gate is the right choice in several common situations:
- Environmental Product Declarations. Many EPD programmes use cradle-to-gate as the standard boundary, so results stay comparable across products.
- Product carbon footprints for B2B customers. When you sell a component or material to another manufacturer, they need the impact up to your gate so they can add it into their own assessment.
- Comparing suppliers. If the use phase is identical regardless of who supplies you, cradle-to-gate isolates the part that actually differs.
- Early-stage product design. When a product is still being designed, the use and disposal stages may be unknown, so cradle-to-gate gives a usable figure now.
It is less suitable when the use phase dominates total impact, for example an appliance that consumes energy for years. There, cradle-to-grave is the honest choice, because a cradle-to-gate figure would hide most of the footprint.
Why the boundary matters for accurate reporting
Two carbon figures for the same product can look completely different purely because of the boundary used. A cradle-to-gate number will almost always be lower than a cradle-to-grave number, simply because it counts fewer stages. Neither is wrong, but comparing one against the other is. This is why credible reporting always states the boundary alongside the result, and why disclosure frameworks and EPD programmes are strict about it. If you are reading or producing an LCA, the boundary is the first thing to check.
Frequently asked questions
Is cradle-to-gate the same as gate-to-gate?
No. Gate-to-gate covers only the processes inside one facility. Cradle-to-gate starts earlier, at raw material extraction, and includes everything up to the factory exit. Gate-to-gate is effectively one segment within a cradle-to-gate study.
Does cradle-to-gate include transportation?
It includes inbound transport, moving raw materials to the factory. It does not include outbound transport to customers or retailers, which falls outside the gate.
Why is a cradle-to-gate figure lower than cradle-to-grave?
Because it counts fewer life cycle stages. Cradle-to-gate stops at the factory gate, so the use phase and end-of-life disposal are not added. A lower number is expected, not a sign of better performance.
Which boundary should my company use?
It depends on the goal. For an EPD or a B2B product footprint, cradle-to-gate is usually standard. For a full consumer product footprint, cradle-to-grave is more honest. If you are unsure, an LCA practitioner can help you scope it correctly.
Need help scoping your life cycle assessment?
Choosing the right system boundary is where most LCA projects succeed or go wrong. Bilancia Consulting helps companies define the correct scope and carry out life cycle assessments that hold up to scrutiny. Learn more about our Life Cycle Assessment services, or get in touch to discuss your product.