We’ve every been there prior to - anyone gathered out on the deck or patio enjoy it the weather and also fun conversation. The food is ready for the grill, and suddenly you realize you’re out of propane, or don’t have sufficient left in the tank to feed your guests. 

While such a last-minute revelation is easily solved through a fast trip come your neighborhood rebab.net ar or a Blue Rhino exchange station, there are a number of handy top you have the right to use to identify ahead of time whether you have enough propane for her event. Below, we’ll outline four methods the will help you examine your propane tank level. 

How to examine the level of a propane tank

1. The warmth water, cool hand method

This is the quickest and also easiest way to obtain a feeling for the propane level in her tank. Merely pour heat water over your tank, and also then run your hand along the side of the tank.

As you reach the level the propane in her tank, the temperature will revolve cool come the touch. This method relies ~ above a physics reaction between the warm water on the tank surface and also the propane inside her tank - developing a temperature difference you can feel. As the hot water heats the tank’s exterior, the propane reacts, developing a cool spot at the to fill level. This method won’t offer you a specific reading, but it will permit you come estimate how close you room to needing a tank exchange. 

2. Using a gauge

This basic solution offers users an instant-read on measure up the level of your portable liquid propane gas tanks. Many portable LPG cylinders equipped with gauges to express the volume the propane in state of percentage of full - reflecting 100 percent once the tank is complete with 20 pounds that propane, then dropping throughout use. 

Such gauges job-related from press inside the tank, and also make a determination of staying levels. This style of push reading gauge have the right to be found in house repair and also retail outlets transparent the country. They room inexpensive, simple to install, and easy to read. As soon as yours is in place, you’ll just remove it as soon as the tank is depleted and install it on your next one. 

3. For much more Precision: Tipping the range Method

This an approach offers a more precise measurement, but it requires some initiative to disconnect her propane tank from the grill. You’ll additionally need a family members scale and the patience to execute a couple of simple calculations. 

Propane tanks normally are stamped through an empty or “tare” weight - usually between 17 and 19 pounds. A conventional sized propane tank once filled holds 20 pounds that propane. Location the tank ~ above your scale to get the total weight, and then subtract “tare” load to identify how plenty of pounds that propane is left in her tank. 

Pounds that propane remaining = - <“tare” weight: 17-19 lbs> 

The formula can be lugged out more to recognize the variety of gallons, and also beyond, to estimate the lot of food preparation time left in your tank. Take your net weight divided by 4.2 to transform the analysis to gallons.

Gallons the propane = tank load in lbs. / 4.2 

A gallon that propane contains roughly 92,000 BTUs, and a reading of your grills BTU per hour rating have the right to offer a rough estimate of food preparation time left in her tank. 


4. The Mathematician Method: exactly how Much food preparation Time perform You have actually Left

Get out your calculator, since this complicated method that determining how much propane is in her tank calls for several steps through the world of math formulas. However it is one of the most accurate approaches to estimating her propane level - and can be supplied in a predictive manner as you deplete your tank. 

Remember these figures: A complete tank contains 20 pounds the propane, the load of propane separated by 4.2 converts the units right into gallons, and a gallon the propane produces around 92,000 BTUs the energy. To finish the formula you’ll require to know the BTU per hour rating of your grill, and you’ll need to element in the heat setup you arrangement to usage while grilling. 

For example, to recognize the minimum quantity of cooking time you can expect you’ll have the ability to cook v a full tank, you have the right to use the formula: 


cooking Time = _______________________

Max BTU per hour of grill 

In this case, her propane tank has actually 4.76 gallons the propane qualified of delivering around 438,000 BTUs. If your grill is rated for 30,000 BTU per hour on the high setup (438,000/30,000) you have the right to expect between 14 and also 15 hours of food preparation time on the highest possible setting. 

How to readjust for different cooking temperatures

To do adjustments for food preparation temperature, you’ll have to encompass something well-known as the “K” factor, i m sorry assigns a numerical value to food preparation temperature. Because that instance, only using 3 burners ~ above a 4 burner unit, top top a medium setting, is assigned a K element of .56. Transform the ahead formula come account for the K factor would appear as this: 


food preparation Time = _______________________

(.56 x 30,000) 

This method at the lower usage, you might expect approximately 26 hours of cooking time. 

While rather complicated, this formula have the right to be a funny exercise, and also with part tweaking could assist you predict no just how much food preparation time you will do it have, yet how much propane you’ve provided with each outing. 


How perform you recognize if her propane tank is expired?

Most portable tanks room stamped through a to produce or test date, in addition to an inspector’s mark. If this is something come be aware of, it’s typically not something you’ll have to concern about. Portable propane tanks last in between 10-12 years, and also the professionals at rebab.net and Blue Rhino certain that newer tanks are functioned into circulation on a continuous basis. 



Easily exchange her empty propane tank at a rebab.net place near you

Equipped v these formulas and also tools, you shouldn’t ever find yourself there is no propane once you need it most.

You are watching: How to tell how much propane is left in 100 lb tank

See more: Lucy Hale Wizards Of Waverly Place ' Guest Stars: Celebrity Appearances

But, if you ever before do, remember that you’re never far away indigenous the fuel you require for your backyard gatherings. Using this easy place finder, you will do it be back to the barbecue in no time.