Calculator Inputs and Outputs
Inputs
- Tank water capacity (gal) — example: 100
- Usable fill percentage (%) — example: 80
- Appliance input (Btu/h) — example: 80000
- Average use per day (h/day) — example: 4
Results
- Estimated propane duration (days)
- Available appliance hours (hours)
- Usable propane (gal)
Formula used
Available energy ≈ usable propane gallons × 91,500 Btu/gal; days = energy ÷ daily appliance input.
How to Use the Propane Tank Duration Calculator
Enter the requested values, check the units and assumptions, then select Calculate Propane Tank Duration. The built-in defaults provide a complete working example.
Formula
Available energy ≈ usable propane gallons × 91,500 Btu/gal; days = energy ÷ daily appliance input.
Understanding the Results
The primary answer appears first. Supporting outputs show related quantities, conversions, dates, costs, ratios, or intermediate values. Calculations keep additional precision before display rounding.
Accuracy Tips
- Use measured values and consistent units.
- Review assumptions, rates, timing, and efficiency inputs.
- Recalculate after changing any condition.
Important Note
This tool provides an informational estimate. Confirm critical financial, medical, construction, scientific, tax, legal, or safety decisions with an appropriately qualified professional.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology