How Much Does A 20lb Propane Tank Cost?
How Much Does A 20lb Propane Tank Cost? A 20 lb propane tank will cost approximately $14-$20 to fill. The rate you pay depends on the refill cost, usually $3- $4 per gallon. Since a 20 lb tank holds about 4.7 gallons of propane, multiply the cost of propane per gallon by 4.7. For example,