How Long Does a Propane Tank Last? | ProPath
How Long Does a Propane Tank Last?
Estimate runtime for grills, RVs, generators, patio heaters, fire pits and more.
Calculate My Runtime91,500
BTUs per gallon4.7
Gallons in a full 20 lb tank430k
Approximate BTUs in a 20 lb tank80%
Maximum safe fill levelRuntime Calculator
Estimated Runtime: 14.3 hours
Estimates assume a full tank and continuous appliance operation.
Typical Runtime Comparison
| Appliance | 20 lb | 30 lb | 100 lb |
|---|---|---|---|
| Gas Grill | 18 hrs | 27 hrs | 92 hrs |
| Patio Heater | 9 hrs | 14 hrs | 47 hrs |
| Generator | 10 hrs | 15 hrs | 50 hrs |
| Fire Pit | 8 hrs | 12 hrs | 39 hrs |
Visual Runtime
100 lb Tank
40 lb Tank
30 lb Tank
20 lb Tank
1 lb Cylinder
What Affects Runtime?
🔥
Heat Output
Higher BTU appliances consume propane faster.
Higher BTU appliances consume propane faster.
🌡
Weather
Cold weather increases propane demand.
Cold weather increases propane demand.
💨
Wind
Wind lowers efficiency outdoors.
Wind lowers efficiency outdoors.
⚙
Appliance Efficiency
Newer equipment typically burns less fuel.
Newer equipment typically burns less fuel.
Common Propane Myths
❌ Exchange tanks are always full
Many exchange cylinders contain less propane than a freshly refilled 20 lb tank.
❌ Propane expires
Propane itself does not expire. Cylinders require periodic inspection and recertification.
❌ Cold weather freezes propane
Cold temperatures reduce vapor pressure, making appliances appear weaker.
Related ProPath Guides
Find Propane Before You Run Out
ProPath helps RV travelers, homeowners, grillers and businesses quickly locate nearby propane refill stations, exchanges and trusted propane suppliers.