How Much Is It to Fill a Propane Tank

The cost to fill a propane tank depends on the tank size, propane prices, and refill location. On average, propane costs $3–$5 per gallon, and a standard 20 lb tank refill costs $15–$25. 1. Cost to Fill Common Propane Tank Sizes 📌 Tip: Propane tanks are only filled to 80% capacity to allow for expansion….