Conversion Tables

Use these tables to convert kilograms, pounds, litres, US gallons, normal cubic metres (Nm3) and standard cubic feet (scf) for liquid oxygen, nitrogen, argon and carbon dioxide (CO₂). Weight, liquid volume and gas (vapor) volume never convert one to one, because every gas has its own boiling point and its own liquid and vapour densities. Liquid nitrogen, for example, boils at -195.8 °C and one litre of liquid yields roughly 691 liters of vapor (at 1 bar and 15°C). The tables below give the exact conversion factors for each product, so you can compare supplier quantities and size a cryogenic ISO tank container shipment.

Oxygen UN 1073	Weight		Gas		Liquid
	pounds	kilograms	cubic feet	normal cubic metres (Nm3)	gallons (US)	liters
	(lb)	(kg)	(scf)	(Nm3)	(gal)	(l)
1 pound	1.0	0.4536	12.076	0.3174	0.105	0.3977
1 kilogram	2.205	1.0	26.62	0.6998	0.2316	0.8767
1 scf gas	0.08281	0.03756	1.0	0.02628	0.008691	0.0329
1 Nm3 gas	3.151	1.4291	38.04	1.0	0.3310	1.2528
1 gallon liquid	9.527	4.322	115.1	3.025	1.0	3.785
1 liter liquid	2.517	1.1417	30.38	0.7983	0.2642	1.0
1 short ton	2000	907.2	24160	635	209.9	794.5


Nitrogen UN 1977	Weight		Gas		Liquid
	pounds	kilograms	cubic feet	normal cubic metres (Nm3)	gallons (US)	liters
	(lb)	(kg)	(scf)	(Nm3)	(gal)	(l)
1 pound	1.0	0.4536	13.803	0.3627	0.1481	0.5606
1 kilogram	2.205	1.0	30.42	0.7996	0.3262	1.2349
1 scf gas	0.07245	0.03286	1.0	0.02628	0.01074	0.04065
1 Nm3 gas	2.757	1.2506	38.04	1.0	0.4080	1.5443
1 gallon liquid	6.745	3.06	93.11	2.447	1.0	3.785
1 liter liquid	1.782	0.8083	24.60	0.6464	0.2642	1.0
1 short ton	2000	907.2	27605	725.4	296.2	1121


Argon UN 1951	Weight		Gas		Liquid
	pounds	kilograms	cubic feet	normal cubic metres (Nm3)	gallons (US)	liters
	(lb)	(kg)	(scf)	(Nm3)	(gal)	(l)
1 pound	1.0	0.4536	9.671	0.2543	0.08600	0.3255
1 kilogram	2.205	1.0	21.32	0.5605	0.18957	0.7176
1 scf gas	0.1034	0.04690	1.0	0.02628	0.008893	0.03366
1 Nm3 gas	3.933	1.7840	38.04	1.0	0.3382	1.2802
1 gallon liquid	11.630	5.276	112.5	2.957	1.0	3.785
1 liter liquid	3.072	1.3936	29.71	0.7812	0.2642	1.0
1 short ton	2000	907.2	19342	508.6	172	651.0



Carbon dioxide UN 2187	Weight			Gas		Liquid		Solid
	pounds	tons	kilograms	cubic feet	normal cubic metres (Nm3)	gallons (US)	liters	cubic feet
	(lb)	(t)	(kg)	(scf)	(Nm3)	(gal)	(l)	(cu ft)
1 pound	1.0	0.0005	0.4536	8.741	0.2294	0.11806	0.4469	0.010246
1 short ton	2000.0	1.0	907.2	17483	458.8	236.1	893.9	20.49
1 kilogram	2.205	0.0011023	1.0	1.9253	0.5058	0.2603	0.9860	0.0226
1 scf gas	0.1144	—	0.05189	1.0	0.02628	0.013508	0.05113	0.0011723
1 Nm3 gas	4.359	0.00218	1.9772	38.04	1.0	0.5146	1.948	0.04468
1 gal liquid	8.470	0.004235	3.842	74.04	1.9431	1.0	3.785	0.08678
1 liter liquid	2.238	0.0011185	1.0151	1.9562	0.5134	0.2642	1.0	0.02293
1 cu ft (solid)	97.56	0.0488	44.25	852.8	22.38	11.518	43.60	1.0