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# Propane equivelance of Natural Gas?

#1
01-07-06, 01:20 PM
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Join Date: Nov 2005
Location: Las Cruces, NM -Zone 8
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Propane equivelance of Natural Gas?

Don't know if I worded that right but what I'm trying to learn is how many THERMS does a gallon of propane provide (if you get my drift...)?

I'm new to propane, pre-buying in gallons and used to natural gas, post-paying for THERMS and am wondering what 6 of one and 1/2 dozen of the other is.

#2
01-07-06, 09:29 PM
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On average there are 92,000 Btu's in a gallon of propane.

#3
01-08-06, 01:23 AM
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Join Date: Nov 2005
Location: Las Cruces, NM -Zone 8
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Originally Posted by resercon
On average there are 92,000 Btu's in a gallon of propane.
OK. So if a THERM=100,000 BTU then (for example) 10 THERMS would equate to ("on average") 10.87 gallons of propane and 200 gallons of propane would equate to approx 184 THERMS.

So if I'm paying about a buck per Therm with nat-gas and 1.80 per gal of propane I can expect a huge increase in my gas budget. That's not very good!

Thanks for the info. I've since found a little ditty that computes the Propane vs. Nat-Gas usage in dollars. Amazing...

#4
01-08-06, 08:59 AM
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Join Date: Jan 2006
Posts: 143
Therms

A Therm is 100,000BTUs.

A cubic foot of natural gas provides 1,026 BTUs or .0126 Therms

A gallon of propane produces 91,000 BTUS or .91 Therms

1 Cubic Foot of natural gas = 7.4804 Gallons of Propane

Put another way 1 gallon of Liquid Propane = .1336 cubic feet of natural gas.

Or for every 91,000 BTUs (.91 Therms) you get with 1 gallon of propane you only get 137.15BTUs (.0016844Therms) with natural gas.

At \$1.80 per gallon propane costst you \$.0000197 cents per BTU.
At \$1 per Therm of natural gas, you are paying \$.00001 per BTU.

Put another way, you will pay \$1.97 to produce the same amount of BTUs with Propane that you would cost you \$1.00 to produce with natural gas.

But another way 1 Therm of liquid propane costs \$1.97 cents.
1 Therm of natural gas costs \$1.

Last edited by manhattan42; 01-08-06 at 09:29 AM. Reason: z
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