To determine the number of gallons, multiply the capacity of the cylinder or tank by the percentage. If you have a 120-gallon cylinder and the gauge reads 70%, multiply 120 x . 70, which would give you 84 gallons. If the gauge reads 30% or less, you should arrange for a delivery from your local propane company.Saf. 1, 1441 AH

20 lb tank: 18” tall and 12” in diameter. Holds 5 gallons of propane. Very portable, easy to pick up.Ram. 1, 1437 AH

Propane tanks generally are stamped with an empty or “tare” weight – usually between 17 and 19 pounds. A standard sized propane tank when filled holds 20 pounds of propane. Place the tank on your scale to get the total weight, and then subtract “tare” weight to determine how many pounds of propane is left in your tank.Dhuʻl-Q. 18, 1441 AH

about 37 pounds
Most propane grill cylinders weigh about 17 pounds when empty and hold about 20 pounds of gas, making the weight of a full propane cylinder about 37 pounds.

1 gallon of propane weighs 4.2 pounds. A “full” 20 lb cylinder should have 4.7 gallons or propane in it.

Compare your measurements to the known measurements for consumer propane tanks to determine the size of tank you have. According to the Propane 101 website, a 20-pound propane tank measures 18 inches high and 12.5 inches in diameter. A 30-pound propane tank measures 24 inches high and 12.5 inches in diameter.

Weigh the tank Most propane cylinders for grills weigh about 17 pounds when empty and hold about 20 pounds of propane. Here’s how you use weight to measure how much propane is left in your cylinder: Put it on a scale and note the weight. Subtract the tare weight number.Shaw. 7, 1440 AH

Watch for these signs that it’s time for a propane refill for your household and barbecue tanks.

1. The Tank Feels Light.
2. Your Gauge Tells You It’s Low.
3. The Flame Sputters On Your Propane Appliances.
4. It’s Been a Few Months.
5. The Tank Fails the Hot Water Test.
6. Your Grill Won’t Light.
7. You’re Thinking About the Changing Seasons.

Most 20 lb tanks have a tare weight of +/- 17 pounds when completely empty. This means a “full” propane tank should weigh about 37 pounds . There is also a month and year on the collar indicating the date the tank was made.

You’ll need a larger 500-gallon propane tank. Holding approximately 400 gallons when full due to the 80 percent rule, a 500-gallon tank will generally suffice for a 2,500 to 4,500 square-foot home.

A 20 pound propane tank contains approximately 430,000 BTU’s . To determine how long the tank will last with your fire pit divide 430,000 by the BTU rating of your fire pit. Below we have a table where you can determine how long your gas fire pit will last on a 20 pound propane tank.

Portable Home Propane Tanks. If you use small amounts of propane in a handful of home appliances, you’re likely already familiar with the portable and popular 20-pound propane tank. About 1 1/2 feet tall and 1 foot wide, these tanks hold 5 gallons of propane.