Cubic metres to Cubic feet (m³ to ft³)
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Cubic-metres-to-cubic-feet conversions translate SI bulk-volume figures from international engineering-and-construction documentation, ISO-and-EN compliance, and metric-convention utility-and-shipping documentation into the US-customary cubic-foot primary used for natural-gas-utility-billing, shipping-container-volume, HVAC-airflow, US-construction-trade, and US-customary refrigerator-and-freezer-and-storage capacity documentation. A 33.2 m³ international shipping-container-volume translates to 1172 ft³ on the US-customary ISO 668 documentation; a 2266 m³ metric-convention annual-residential natural-gas translates to 80,000 ft³ or 800 CCF on the US-utility documentation; a 0.623 m³ international SI-appliance figure translates to 22 ft³ on the US-appliance-marketing documentation. The factor is exact at 1 m³ = 35.31466672 ft³, the multiplicative inverse of the ft³-to-m³ conversion fixed by the 1959 international yard-and-pound agreement.
How to convert Cubic metres to Cubic feet
Formula
ft³ = m³ × 35.3147
To convert cubic-metres to cubic-feet, multiply the m³ figure by 35.3147 — the factor exact at 35.31466672 ft³ per m³ under the 1959 international yard-and-pound agreement (1 ft = 0.3048 m exactly, hence 1 m³ = 1/0.3048³ = 35.31466672 ft³). For mental math, "m³ × 35.3" or the simpler "m³ × 35" both give close-to-exact figures: 1 m³ ≈ 35.3 ft³, 10 m³ ≈ 353 ft³, 33.2 m³ ≈ 1172 ft³, 100 m³ ≈ 3531 ft³, 1000 m³ ≈ 35,314 ft³. The conversion runs at every international-SI-m³ source to US-customary-ft³ destination boundary across shipping-container-volume, natural-gas-utility-billing, HVAC-airflow, and appliance-capacity documentation work in cross-international engineering practice globally for ISO 668 intermodal-container-and-cargo-volume documentation, US-customary natural-gas billing, AHRI HVAC-engineering, and SAE-and-AHAM appliance-marketing integration.
Worked examples
Example 1 — 1 m³
One cubic metre equals 35.31466672 cubic feet, the multiplicative inverse of 0.028316846592 m³ per ft³. The factor is exact under the 1959 international yard-and-pound agreement.
Example 2 — 33.2 m³
Thirty-three point two cubic metres — the internal-volume of a typical 20-foot intermodal-shipping container in SI units — converts to 1172 ft³ on the US-customary ISO 668 shipping documentation. The m³-figure is the international SI primary; the ft³-figure is the US-customary ISO 668 reference.
Example 3 — 0.623 m³
Zero point six two three cubic metres — a typical residential-refrigerator capacity in SI units — converts to 22 ft³ on the US-customary appliance-marketing documentation. The m³-figure is the international SI-appliance primary; the ft³-figure is the US-customary appliance-marketing reference under SAE-and-AHAM appliance conventions.
m³ to ft³ conversion table
| m³ | ft³ |
|---|---|
| 1 m³ | 35.3147 ft³ |
| 2 m³ | 70.6293 ft³ |
| 3 m³ | 105.944 ft³ |
| 4 m³ | 141.2587 ft³ |
| 5 m³ | 176.5733 ft³ |
| 6 m³ | 211.888 ft³ |
| 7 m³ | 247.2027 ft³ |
| 8 m³ | 282.5173 ft³ |
| 9 m³ | 317.832 ft³ |
| 10 m³ | 353.1467 ft³ |
| 15 m³ | 529.72 ft³ |
| 20 m³ | 706.2933 ft³ |
| 25 m³ | 882.8667 ft³ |
| 30 m³ | 1059.44 ft³ |
| 40 m³ | 1412.5867 ft³ |
| 50 m³ | 1765.7333 ft³ |
| 75 m³ | 2648.6 ft³ |
| 100 m³ | 3531.4667 ft³ |
| 150 m³ | 5297.2 ft³ |
| 200 m³ | 7062.9333 ft³ |
| 250 m³ | 8828.6667 ft³ |
| 500 m³ | 17657.3334 ft³ |
| 750 m³ | 26486 ft³ |
| 1000 m³ | 35314.6667 ft³ |
| 2500 m³ | 88286.6668 ft³ |
| 5000 m³ | 176573.3336 ft³ |
Common m³ to ft³ conversions
- 1 m³=35.3147 ft³
- 5 m³=176.5733 ft³
- 10 m³=353.1467 ft³
- 33.2 m³=1172.4469 ft³
- 67.7 m³=2390.8029 ft³
- 100 m³=3531.4667 ft³
- 500 m³=17657.3334 ft³
- 1000 m³=35314.6667 ft³
- 2266 m³=80023.0348 ft³
- 10000 m³=353146.6672 ft³
What is a Cubic metre?
The cubic metre (m³) is defined as exactly 1 m × 1 m × 1 m by direct geometric construction from the SI metre, with the metre itself fixed by the 1983 17th CGPM definition (distance travelled by light in vacuum in 1/299,792,458 of a second). Equivalently, 1 m³ = 1000 litres = 10⁶ cm³ = 10⁹ mm³ = 35.31466672 ft³. Submultiples follow standard SI prefix conventions: the cubic decimetre (dm³ = 1 litre) at 10⁻³ m³ for everyday-bulk-volume work, the cubic centimetre (cm³ = mL) at 10⁻⁶ m³ for small-volume work, the cubic millimetre (mm³) at 10⁻⁹ m³ for micro-fluidics-and-micro-pipetting work. Multiples include the cubic kilometre (km³, 10⁹ m³) for environmental-and-geological-bulk-volume work, with typical-Antarctic-glacier-volumes at 10⁵-10⁶ km³ scale. The cubic metre is the universal SI-derived bulk-volume unit, with consistent geometric-construction relationships across the entire SI prefix system.
The cubic metre is the SI-derived bulk-volume unit defined since the 1799 establishment of the metric system in revolutionary France as exactly 1 m × 1 m × 1 m = 1000 dm³ = 1000 litres. The metre itself was redefined at the 17th CGPM in 1983 as the distance travelled by light in vacuum in 1/299,792,458 of a second, transitively redefining the cubic metre via the m³ = m × m × m geometric construction. The unit became the universal SI bulk-volume reference for engineering-and-construction-and-utility-and-natural-gas documentation through the twentieth-century metrication transitions across continental Europe, Asia, Australasia, Latin America, Africa, and parts of North America. Modern international engineering-and-construction documentation uses m³ universally for concrete-and-aggregate-volume, shipping-container-volume (20-foot intermodal-container 33.2 m³ internal-volume, 40-foot container 67.7 m³), natural-gas-utility-billing in metric-convention countries (typical EU residential annual natural-gas 1500-3000 m³), HVAC airflow in m³/h or m³/s, and bulk-storage-tank capacity ratings (typical residential heating-oil tank 0.5-1 m³, typical industrial liquid-storage tank 100-10,000 m³). The cubic metre is the universal SI-derived bulk-volume unit globally for engineering work, with the cubic foot dominating US-customary practice.
Construction-and-engineering globally — every modern construction-trade document expresses concrete-and-aggregate volumes in cubic-metres under EU-and-Asia-and-Latin-America-and-Australasia-and-Africa metric-convention construction conventions. Typical residential-foundation concrete-pour 5-15 m³, typical commercial-foundation 50-500 m³, typical large-bridge-and-dam concrete-pour 1000-100,000 m³. Shipping-and-logistics intermodal-container volume globally: 20-foot intermodal-container 33.2 m³ internal-volume, 40-foot intermodal-container 67.7 m³, 40-foot high-cube container 76.4 m³. Natural-gas-utility-billing in metric-convention countries: typical EU-residential annual natural-gas 1500-3000 m³, commercial natural-gas 10,000-100,000 m³/year. HVAC airflow in m³/h or m³/s under EU-and-Asia-and-Latin-America-and-Australasia-and-Africa HVAC conventions. Bulk-storage-tank capacity ratings: typical residential heating-oil tank 0.5-1 m³, typical industrial liquid-storage tank 100-10,000 m³, typical petrochemical-and-water-utility storage-tank 1000-1,000,000 m³. Environmental-and-geological-bulk-volume in km³ (= 10⁹ m³): typical-Antarctic-glacier-volumes at 10⁵-10⁶ km³ scale, typical-major-reservoir-volumes at 10-100 km³ scale. International-engineering documentation universally uses m³ for bulk-volume work, with the cubic-foot dominating US-customary practice.
What is a Cubic foot?
The cubic foot (ft³, cu ft) is defined as exactly 1 ft × 1 ft × 1 ft = 0.028316846592 m³, with the figure exact under the 1959 international yard-and-pound agreement that fixed 1 ft = 0.3048 m exactly. Equivalently, 1 ft³ = 28.316846592 litres = 28,316.846592 cubic-centimetres. The CCF (one hundred cubic feet, equal to 100 ft³ = 2.832 m³) is the standard US-natural-gas utility-billing unit; the MCF (one thousand cubic feet) is the standard US-natural-gas wholesale-trading unit. The cubic-feet-per-minute (CFM) is the standard US-customary HVAC airflow-rating unit. The cubic-yard (yd³ = 27 ft³ = 0.7646 m³) is the standard US-construction concrete-and-aggregate-volume unit. The cubic-inch (in³, 1/1728 ft³ ≈ 16.39 cm³) is used for engine-displacement in legacy US-customary automotive documentation (typical 350 in³ small-block-V8 = 5740 cc).
The cubic foot traces to historical English customary measurement, with the foot itself fixed at exactly 0.3048 m by the 1959 international yard-and-pound agreement. The cubic foot follows by direct geometric construction as exactly 1 ft × 1 ft × 1 ft = 0.3048³ m³ = 0.028316846592 m³, with the figure exact under the 1959 international yard-and-pound agreement. The unit was the universal English-customary bulk-volume unit through the early-modern era, surviving into modern US-customary engineering practice for natural-gas-volume billing (the universal US-utility natural-gas billing unit, with US natural-gas appliances and utility-meters specified in cubic feet and ccf = 100 cubic feet), shipping-container volume (typical 20-foot intermodal-container 1172 ft³ internal-volume, 40-foot container 2389 ft³), HVAC duct-and-airflow specifications (typical residential-HVAC airflow in CFM = cubic feet per minute), construction-trade material-volume specifications (concrete-and-aggregate volumes in cubic yards = 27 ft³), and US-customary refrigerator-and-freezer-and-storage capacity ratings (typical residential refrigerator 18-25 ft³). The cubic foot persists alongside the SI cubic metre in US-customary engineering documentation across natural-gas-utility, shipping-and-logistics, HVAC-airflow, and storage-capacity contexts globally.
US-customary natural-gas utility-billing globally — every US-residential-and-commercial-and-industrial natural-gas utility bill expresses gas-consumption in CCF (100 cubic feet) or therms under US-customary natural-gas conventions. Typical US-residential annual gas-consumption 600-1200 CCF (60-120 MCF); commercial gas-consumption 1000-10,000 CCF/year. Shipping-and-logistics intermodal-container volume: 20-foot intermodal-container 1172 ft³, 40-foot intermodal-container 2389 ft³, 40-foot high-cube container 2696 ft³. HVAC airflow specifications in CFM (cubic-feet-per-minute): typical residential-HVAC supply-airflow at 350-1200 CFM, typical commercial-HVAC at 1000-50,000 CFM. US-construction-trade material-volume specifications: concrete-and-aggregate volumes in cubic-yards (= 27 ft³), with typical residential-foundation 5-15 cubic-yards (135-405 ft³), commercial-foundation 50-500 cubic-yards (1350-13,500 ft³). US-customary refrigerator-and-freezer-and-storage capacity ratings: typical residential refrigerator 18-25 ft³, typical chest freezer 5-15 ft³, typical large-residential freezer 20-25 ft³. US-customary firewood-and-mulch retail in cubic-yards (= 27 ft³). The cubic foot is the universal US-customary bulk-volume unit, with the cubic metre dominating SI-and-international-engineering documentation.
Real-world uses for Cubic metres to Cubic feet
International SI m³ shipping-container-volume translated to ft³ for US-customary ISO 668 shipping documentation
International SI m³ shipping-container-volume figures from EU-and-Asia-and-Latin-America-and-Australasia-and-Africa shipping documentation translate to ft³ for US-customary ISO 668 shipping documentation when international containers are integrated with US-customary shipping-and-logistics pipelines. A 33.2 m³ 20-foot container translates to 1172 ft³; a 67.7 m³ 40-foot container translates to 2389 ft³; a 76.4 m³ 40-foot high-cube container translates to 2696 ft³. The conversion runs at every international-SI-m³ container source to US-customary-ft³ ISO 668 shipping documentation step.
Metric-convention m³ natural-gas-utility-billing translated to ft³ for US-customary utility documentation
Metric-convention m³ natural-gas-utility-billing figures from EU-and-Asia-and-Latin-America-and-Australasia-and-Africa metric-convention natural-gas billing translate to ft³ (CCF = 100 ft³, MCF = 1000 ft³) for US-customary utility documentation when international natural-gas-trading is integrated with US-customary natural-gas-utility pipelines. A 2266 m³ annual-residential consumption translates to 80,000 ft³ or 800 CCF; a 283 m³ commercial-monthly translates to 10,000 ft³ or 10 MCF; a 2832 m³ industrial-monthly translates to 100,000 ft³ or 100 MCF. The conversion runs at every metric-convention-m³ source to US-customary-CCF-and-MCF utility documentation step.
International SI m³ HVAC-airflow translated to ft³ for US-customary CFM HVAC documentation
International SI m³ HVAC-airflow figures from EU-and-Asia-and-Latin-America-and-Australasia-and-Africa HVAC documentation translate to ft³ (CFM = ft³ per minute) for US-customary CFM HVAC documentation under AHRI conventions when international-source HVAC equipment is exported to US markets. A 28.3 m³/min residential-HVAC translates to 1000 CFM; a 283 m³/min commercial-HVAC translates to 10,000 CFM; a 1699 m³/h residential-HVAC-airflow translates to 1000 CFM. The conversion runs at every international-SI-m³/min-and-m³/h source to US-customary-CFM HVAC documentation step.
International SI m³ appliance-capacity translated to ft³ for US-customary appliance-marketing documentation
International SI m³ appliance-capacity figures from EU-and-Asia-and-Latin-America-and-Australasia-and-Africa metric-convention appliance specifications translate to ft³ for US-customary appliance-marketing documentation under SAE-and-AHAM appliance conventions when international-market refrigerators-and-freezers are imported to US markets. A 0.623 m³ residential refrigerator translates to 22 ft³; a 0.227 m³ chest freezer translates to 8 ft³; a 0.708 m³ large-residential-refrigerator translates to 25 ft³. The conversion runs at every international-SI-m³ source to US-customary-ft³ appliance-marketing documentation step.
When to use Cubic feet instead of Cubic metres
Use cubic-feet whenever the destination is US-customary natural-gas-utility-billing under US-customary natural-gas conventions, US-customary HVAC-airflow specifications under AHRI conventions, US-construction-trade documents under US-IBC building-code submission conventions, US-customary refrigerator-and-freezer-and-storage capacity ratings, US-customary ISO 668 shipping-and-logistics documentation, or any US-customary context where ft³-scale granularity matches everyday US-customary bulk-volume intuition. The cubic-foot is the universal US-customary bulk-volume unit. Stay in cubic-metres when the destination is international SI shipping-and-logistics documentation under ISO 668 intermodal-container conventions, metric-convention utility documentation under EU-and-Asia-and-Latin-America-and-Australasia-and-Africa metric-convention natural-gas billing conventions, international SI HVAC documentation, international SI-appliance documentation, or any international-engineering context where m³ is the standard reference unit. The conversion is the universal SI-to-US-customary bulk-volume scale-shift between m³-source and ft³-destination engineering documentation.
Common mistakes converting m³ to ft³
- Treating "1 m³ = 1 ft³" as a rough equivalence. The two units differ by a factor of about 35.3 (cubic-metres-to-cubic-feet), and substituting one for the other gives a 35-fold volume-magnitude error. The correct factor is 1 m³ = 35.3 ft³ exactly under the 1959 international yard-and-pound agreement.
- Confusing cubic-metres (m³, a volume unit) with cubic-metres-per-second (m³/s, a flow-rate unit). HVAC-airflow specifications use m³/s or m³/h for supply-and-return airflow rates, while bulk-storage-and-shipping uses m³ for total-volume. Substituting one for the other in HVAC-engineering documentation gives unit-error.
Frequently asked questions
How many ft³ in 1 m³?
One cubic metre equals 35.31466672 cubic feet, the multiplicative inverse of 0.028316846592 m³ per ft³. The factor is exact under the 1959 international yard-and-pound agreement. The "1 m³ ≈ 35.3 ft³" reference is universal in modern SI-to-US-customary bulk-volume conversion across shipping-and-logistics, natural-gas-utility, HVAC-airflow, and appliance-capacity documentation work.
How many ft³ in 33.2 m³ (20-foot container)?
Thirty-three point two cubic metres equals 1172 cubic feet. That is the internal-volume of a typical 20-foot intermodal-shipping container translated to US-customary ISO 668 shipping documentation. The m³-figure sits on the international SI primary specification and the ft³-figure sits on the US-customary ISO 668 reference for cross-international shipping-and-logistics integration.
How many ft³ in 0.623 m³ (residential refrigerator)?
Zero point six two three cubic metres equals 22 cubic feet. That is a typical residential-refrigerator capacity in SI units translated to US-customary appliance-marketing documentation. The m³-figure sits on the international SI-appliance primary specification and the ft³-figure sits on the US-customary appliance-marketing reference under SAE-and-AHAM appliance conventions.
Quick way to convert m³ to ft³ in my head?
Multiply the m³ figure by 35.3 (or by 35 for rough). For 1 m³ that gives 35.3 ft³, for 10 m³ that gives 353 ft³, for 33.2 m³ that gives 1172 ft³, for 100 m³ that gives 3531 ft³. The exact factor is 35.31466672, with the rounded "× 35.3" approximation within 0.04% of exact for everyday bulk-volume conversion work.
How many m³ in 1 ft³?
One cubic foot equals exactly 0.028316846592 m³, fixed by the 1959 international yard-and-pound agreement (1 ft = 0.3048 m exactly). The factor is exact rather than measured.
When does m³-to-ft³ conversion appear in real work?
It appears in international SI m³ shipping-container-volume translated to ft³ for US-customary ISO 668 shipping documentation and in metric-convention m³ natural-gas-utility-billing translated to ft³ for US-customary utility documentation. It also appears in international SI m³ HVAC-airflow translated to ft³ for US-customary CFM HVAC documentation and in international SI m³ appliance-capacity translated to ft³ for US-customary appliance-marketing documentation. The conversion is one of the most-run SI-to-US-customary bulk-volume conversions globally.
How precise should m³-to-ft³ be for engineering work?
For engineering work the m³-to-ft³ conversion is exact (factor 35.31466672 exactly under the 1959 international yard-and-pound agreement), and the precision allowance comes from the underlying source-measurement precision rather than the conversion itself. Most engineering documentation rounds to 4-5 significant figures (1 m³ ≈ 35.31 ft³), which is sufficient for typical shipping-and-logistics, natural-gas-utility, HVAC-airflow, and appliance-capacity applications.