Cold Storage Capacity & How Much Fits Inside?
Holds tonnes
Enter room dimensions and a stacking efficiency to get usable volume, then capacity in tonnes and crates — by crate count or by bulk density.
Size your cold room
Next: leave 8–10% air gaps, stack on pallets with channels for cold-air circulation, and don't exceed the room's refrigeration load.
Stacking efficiency 55–70% typical; bulk densities vary by commodity; refrigeration capacity (not just volume) can be the real limit.
Cold storage capacity — key facts
- Room volume
- L × W × H
- Usable volume
- volume × stacking efficiency
- Stacking efficiency
- ≈ 55–70%
- Crate tonnes
- crates × net kg
- Bulk tonnes
- usable × bulk density ÷ 1000
- Potato / onion / apple
- ≈ 650 / 550 / 330 kg/m³
- Leave gaps
- ≈ 8–10% for airflow
- Real limit
- cooling load, not just volume
Volume isn't the same as capacity
A cold room's raw volume is length times width times height, but you can never fill all of it. Produce needs air gaps, the stack needs aisles to load and inspect, and chilled air has to circulate to every box — so a realistic store runs at about 55–70% of its volume actually filled. That single stacking-efficiency figure is what separates a number that looks good on paper from one your room can really hold. From the usable volume you get tonnes either by counting whole crates or by applying the produce's bulk density.
This tool returns capacity in tonnes, room volume, usable volume, the number of crates and crates per cubic metre in both crate and bulk modes. Over-packing is the classic mistake — it blocks airflow and causes spoilage — so leave 8–10% gaps, stack on pallets with channels, and remember the refrigeration load, not the floor area, can be the real ceiling. Pair it with the Cold Storage Shelf-Life, Grain Storage Capacity and Storage Loss tools to plan the whole post-harvest chain.
Size the room right
Tonnes and crates a cold room can actually hold.
Plan air gaps
Stacking efficiency keeps airflow for safe cooling.
Crate or bulk
Model boxes or loose piles, whichever you load.
Match your produce
Bulk density for potato, onion, apple and more.
Frequently Asked Questions
How is cold storage capacity calculated?+
First, room volume = length × width × height. Not all of that holds produce, so usable volume = room volume × stacking efficiency. In crate mode the tool divides usable volume by the volume of one crate and multiplies by the net kg per crate. In bulk mode it multiplies usable volume by the produce's bulk density and divides by 1000 to get tonnes.
What is stacking efficiency and what value should I use?+
Stacking efficiency is the share of room volume actually filled with produce after you allow for air gaps, aisles, the gap to the walls and ceiling, and the space cold air needs to circulate. A realistic figure is about 55–70%. Use the lower end for loose bulk and good airflow, the higher end for tightly palletised crates with planned channels.
What is the difference between crate mode and bulk mode?+
Crate mode suits produce stored in boxes or bins: crates = ⌊usable volume ÷ crate volume⌋ and tonnes = crates × net kg per crate. Bulk mode suits produce piled loose or in large heaps: tonnes = usable volume × bulk density ÷ 1000. Pick the mode that matches how you actually load the room.
What bulk density should I use for my produce?+
Bulk density is the mass of produce per cubic metre of stack, including the air gaps between items. Typical values are around 650 kg/m³ for potatoes, 550 kg/m³ for onions and 330 kg/m³ for apples. Denser, rounder produce packs tighter; leafy or irregular produce is lighter per cubic metre.
Why shouldn't I pack the room completely full?+
Cold storage works only if chilled air can reach every part of the stack. Over-packing blocks airflow, creates warm pockets, and leads to condensation, rot and uneven cooling. Leave roughly 8–10% gaps, keep aisles clear, and stack on pallets with channels so air can move through — that is exactly what the stacking efficiency captures.
How do I get more usable capacity safely?+
Use the room height with secure, stable stacking and pallet racking, keep crate sizes consistent so they nest without wasted space, and plan aisles and channels deliberately rather than leaving random gaps. You raise effective stacking efficiency without choking airflow — gaining tonnes without risking the produce.
Can the refrigeration limit capacity before the volume does?+
Yes. The room's volume tells you how much produce fits, but the refrigeration plant has to remove field heat, respiration heat and any heat leaking in. If you load more than the plant can cool and hold at temperature, capacity — not space — becomes the real limit, so size the cooling load to the produce, not just the floor area.
Does crate mode account for the space between crates?+
Yes — by using whole crates that fit in the usable volume, and by setting usable volume below room volume via stacking efficiency, the result already allows for aisles, wall clearance and circulation gaps. For best accuracy use the actual outside volume of your crate, including its walls, not just the internal hold.
What units does the calculator use?+
Enter room dimensions in metres, crate dimensions and net weight per crate for crate mode, and bulk density in kg/m³ for bulk mode. Outputs are capacity in tonnes, room volume and usable volume in cubic metres, the number of crates, and crates per cubic metre, so you can compare layouts at a glance.
Is this an exact figure for my cold store?+
No — it is a planning estimate. Real capacity depends on your exact crate sizes, how neatly the room is loaded, your produce, and the refrigeration plant's ability to hold temperature. Use it to size a room, compare crate-versus-bulk loading and plan a season, then verify against your own loading trials and cooling load.