On this page
- 01What is the formula for cold room capacity?
- 02How do you calculate cold room capacity in feet?
- 03How do you calculate cold room capacity in metres?
- 04What size cold room do you need for 5, 10 or 20 MT?
- 05Why does the commodity change the answer?
- 06Why do '1 ton = X cubic feet' thumb rules mislead?
- 07Is storage capacity the same as refrigeration capacity?
- FAQFrequently asked questions
Quick answer
Cold room capacity (MT) = gross volume (m³) × usable fraction × as-stacked bulk density (kg/m³) ÷ 1,000. On HyperCold's chiller basis (0.65 usable, 550 kg/m³), a 10 MT room needs about 28 m³ (988 cft), for example 10 × 10 × 10 ft internal; crated fruit and vegetables need about 1,140 cft.
Key takeaways
- Capacity (MT) = gross volume (m³) × usable fraction × as-stacked bulk density (kg/m³) ÷ 1,000.
- HyperCold's chiller basis is 0.65 × 550 kg/m³, so a 10 MT chiller needs about 28 m³ (988 cft) — for example 10 × 10 × 10 ft.
- Crated fruit and vegetables need about 114 gross cft per MT, crated potato 88 and leafy vegetables 228.
- The same 10 × 10 × 9 ft room holds 4.0 MT of leafy vegetables but 10.5 MT of potato.
- A flat 15 kg per gross cft rule over-rates a 10 × 10 × 10 ft chiller by about 50% (15 MT against 10.0 MT).
What is the formula for cold room capacity?
HyperCold's configurator calculates storage capacity from two auditable factors instead of one blended thumb rule:
Capacity (MT) = gross volume (m³) × usable fraction × as-stacked bulk density (kg/m³) ÷ 1,000
- Gross volume is internal length × width × height. Working in feet, multiply cubic feet by 0.0283168 to get m³ (1 ft = 0.3048 m).
- Usable fraction is the share of that volume actually occupied by stacked product after aisles, 100–150 mm wall clearance, a 300–450 mm ceiling air gap, pallet and crate voids and the evaporator's air path.
- As-stacked bulk density is the weight of product plus its crate, carton or pallet per m³ of stack — not the density of the product itself.
The values the configurator uses for each room type:
| Room type (storage style) | Usable fraction | Bulk density | Effective load | Gross volume per MT |
|---|---|---|---|---|
| Fruits & vegetables (crates) | 0.62 | 500 kg/m³ | 310 kg/m³ | 3.23 m³ (114 cft) |
| Chiller (racked cartons) | 0.65 | 550 kg/m³ | 357.5 kg/m³ | 2.80 m³ (99 cft) |
| Frozen or deep freeze (cartons) | 0.65 | 600 kg/m³ | 390 kg/m³ | 2.56 m³ (91 cft) |
| Ripening chamber (crate stacks) | 0.55 | 520 kg/m³ | 286 kg/m³ | 3.50 m³ (123 cft) |
| Fresh meat (hanging rails) | 0.45 | 550 kg/m³ | 247.5 kg/m³ | 4.04 m³ (143 cft) |
| Blast freezer (trolleys) | 0.40 | 550 kg/m³ | 220 kg/m³ | 4.55 m³ (161 cft) |
| Egg room (tray cartons) | 0.55 | 380 kg/m³ | 209 kg/m³ | 4.78 m³ (169 cft) |
| Pharma (validated racking) | 0.50 | 350 kg/m³ | 175 kg/m³ | 5.71 m³ (202 cft) |
| Floriculture (boxes, buckets) | 0.45 | 230 kg/m³ | 103.5 kg/m³ | 9.66 m³ (341 cft) |
An ante room is rated at zero: it is a buffer zone, not storage.
How do you calculate cold room capacity in feet?
Worked example: a 10 × 10 × 9 ft internal room for mixed fruit and vegetables in crates.
- Gross volume = 10 × 10 × 9 = 900 cft.
- Convert to m³: 900 × 0.0283168 = 25.49 m³.
- Usable volume: 25.49 × 0.62 = 15.80 m³ of stacked crates.
- Weight: 15.80 × 500 kg/m³ = 7,900 kg.
- Capacity: 7,900 ÷ 1,000 = 7.9 MT.
A shortcut on the same basis: 0.62 × 500 × 0.0283168 = 8.78 kg per gross cft, so 900 cft × 8.78 ≈ 7,900 kg. The configurator reports rooms under 10 MT to the nearest 0.1 MT and larger rooms to the nearest 0.5 MT, and shows a ±12% planning band — here 7.0–8.8 MT — because packaging, stacking discipline and product grade legitimately move the real load.
How do you calculate cold room capacity in metres?
Worked example: a chiller with 3.6 × 3.0 × 3.0 m internal dimensions holding racked cartons.
- Gross volume = 3.6 × 3.0 × 3.0 = 32.4 m³ (32.4 ÷ 0.0283168 = 1,144 cft).
- Usable volume: 32.4 × 0.65 = 21.06 m³.
- Weight: 21.06 × 550 = 11,583 kg.
- Capacity: 11.58 MT, reported as 11.5 MT (nearest 0.5 MT above 10 MT), with a planning band of 10.1–12.9 MT.
If you know the commodity, swap in its own as-stacked density; the usable fraction stays with the room's storage style. The configurator holds 600 kg/m³ for dairy and 700 kg/m³ for beverages, so the same room rates at 32.4 × 0.65 × 600 ÷ 1,000 = 12.6 MT of dairy (reported 12.5 MT) or 14.7 MT of beverages (reported 14.5 MT). Where several commodities share a room, their densities are averaged.
What size cold room do you need for 5, 10 or 20 MT?
Turn the formula round: gross volume (m³) = capacity (MT) × 1,000 ÷ (usable fraction × bulk density). With the configurator's bases:
| Capacity | Crated F&V (310 kg/m³) | Chiller cartons (357.5 kg/m³) | Frozen cartons (390 kg/m³) | Crated potato (403 kg/m³) |
|---|---|---|---|---|
| 5 MT | 16.1 m³ / 570 cft | 14.0 m³ / 494 cft | 12.8 m³ / 453 cft | 12.4 m³ / 438 cft |
| 10 MT | 32.3 m³ / 1,139 cft | 28.0 m³ / 988 cft | 25.6 m³ / 906 cft | 24.8 m³ / 876 cft |
| 20 MT | 64.5 m³ / 2,278 cft | 55.9 m³ / 1,976 cft | 51.3 m³ / 1,811 cft | 49.6 m³ / 1,753 cft |
Internal sizes that meet each target, keeping width at 10 ft or less so no MS roof support is needed (configurator estimate in brackets):
| Capacity | Crated F&V | Chiller | Frozen | Crated potato |
|---|---|---|---|---|
| 5 MT | 8 × 8 × 9 ft (5.1 MT) | 8 × 8 × 8 ft (5.2 MT) | 8 × 8 × 8 ft (5.7 MT) | 8 × 7 × 8 ft (5.1 MT) |
| 10 MT | 12 × 10 × 10 ft (10.5 MT) | 10 × 10 × 10 ft (10.0 MT) | 12 × 10 × 8 ft (10.5 MT) | 10 × 10 × 9 ft (10.5 MT) |
| 20 MT | 23 × 10 × 10 ft (20.0 MT) | 20 × 10 × 10 ft (20.0 MT) | 18 × 10 × 10 ft (20.0 MT) | 18 × 10 × 10 ft (20.5 MT) |
HyperCold's 5, 10 and 20 MT cost pages use larger planning footprints of about 10 × 10 × 8, 12 × 12 × 9 and 14 × 14 × 10 ft. By the formula those rooms rate at 8.1, 13.0 and 20.0 MT as chillers, or 7.0, 11.5 and 17.0 MT of crated F&V — so the smaller footprints carry loading headroom, and the 12 and 14 ft widths need roof support. Size to your commodity, then price that exact room in the quotation configurator.
Why does the commodity change the answer?
Two rooms of identical size hold very different tonnage. Here is the same 10 × 10 × 9 ft fruit-and-vegetable room (900 cft, 0.62 usable) with the configurator's commodity densities:
| Commodity | As-stacked density | Capacity | kg per gross cft |
|---|---|---|---|
| Leafy vegetables | 250 kg/m³ | 4.0 MT | 4.4 |
| Tomato or mixed vegetables | 480 kg/m³ | 7.6 MT | 8.4 |
| Crated F&V (default) | 500 kg/m³ | 7.9 MT | 8.8 |
| Onion | 550 kg/m³ | 8.7 MT | 9.7 |
| Potato | 650 kg/m³ | 10.5 MT | 11.4 |
That is a 2.6× spread inside the same four walls. Commodities also rarely share a set point: onion wants 65–75% RH while potato wants 90–95% (see the cold storage temperature chart), so a mixed room is usually a compromise on both weight and shelf life.
Why do '1 ton = X cubic feet' thumb rules mislead?
A single cubic-feet-per-ton number hides three mistakes.
- Gross versus usable volume. A flat rule such as 15 kg per gross cft — about 67 cft per MT — assumes the whole room is solid product. On a 10 × 10 × 10 ft chiller that rule gives 15 MT; the usable-volume model gives 10.1 MT (reported 10.0), so the thumb rule over-states capacity by about 50%.
- Product versus package. Crates, cartons and pallets carry air as well as weight. The model uses as-stacked density including packaging, which is why crated potato is 650 kg/m³ — far below the density of a solid tuber, which is above 1,000 kg/m³.
- One number for every commodity. The common Indian planning figure of 100–120 cft per MT is right for palletised fresh produce (the model gives 114 cft per MT), but crated potato needs only 88 cft per MT, leafy vegetables 228 and cut flowers 341.
So a '1 ton = 100 cft' rule over-sizes a potato room by about 14% and under-sizes a leafy-vegetable room by more than half. Use such rules only as a sanity check, never to sign a purchase order.
Is storage capacity the same as refrigeration capacity?
No. Storage capacity (MT) says how much product fits; refrigeration capacity (kW or TR) says how fast heat can be removed. Two 10 MT rooms can need very different machines — one receives a tonne of pre-cooled cartons a day, the other several tonnes of warm field produce every morning.
Refrigeration is sized on the heat load: transmission at a 45 °C design ambient, product pull-down and respiration, door openings, people, lights and defrost, plus a 10% safety margin. The heat load calculator breaks this down in kW and TR (1 TR ≈ 3.517 kW).
The configurator's first machine pick is by volume and temperature band — for a chiller, one 2 HP Daikin unit up to 1,100 cft, a 3 HP unit up to 1,500 cft and a 4 HP unit up to 2,500 cft — and the final selection is confirmed against heat load at the site survey. If you are still defining the requirement, the cold room calculator records product, daily loading and site details for a sized recommendation.
FAQ
Frequently asked questions
How many cubic feet are needed per ton of cold storage?
On HyperCold's model it depends on the product: about 88 gross cft per MT for crated potato, 91 for frozen cartons, 99 for chiller cartons, 114 for crated fruit and vegetables, 228 for leafy vegetables and 341 for cut flowers.
What is the capacity of a 10 × 10 × 10 ft cold room?
A 1,000 cft (28.3 m³) room holds about 10.0 MT as a chiller with racked cartons, 8.8 MT of crated fruit and vegetables, 11.0 MT of frozen cartons or 11.5 MT of crated potato, each within a ±12% planning band.
Does a taller room hold more?
Capacity rises in proportion to gross volume, so going from 8 ft to 10 ft internal height adds 25% — but only if racks, stacking height and handling equipment can use the extra height, because the 300–450 mm ceiling air gap stays.
Does an ante room add storage capacity?
No. HyperCold rates an ante room at zero storage capacity; it is a +10 to +15 °C buffer that protects the main room from heat and moisture.
Why does a freezer hold more tonnes than a chiller of the same size?
Frozen cartons are block-stacked at 600 kg/m³ as-stacked with 65% of the volume used, giving 390 kg per m³ of gross volume against 357.5 kg for a racked chiller. A 10 × 10 × 10 ft room therefore rates at 11.0 MT frozen versus 10.0 MT chilled.
Written by
HyperCold Engineering Team
Cold room and cold storage engineers at HyperCold™, a Daikin equipment partner founded in 2020 and headquartered in Sirsaganj, Firozabad (UP). We design, manufacture PUF panels for, install and maintain cold rooms across India.