Select the value to solve and specify standard or actual gas flow. Fuel input rate equals standard flow multiplied by heating value; actual flow also needs absolute pressure and gas temperature.

Convert gas flow and heat value to a fuel input rate.

Standard flow already accounts for pressure. Actual-flow correction assumes ideal gas; use heat value and reference conditions from the same gas specification. Fuel input is not delivered heating output.

Related Calculators

Gas Pressure To BTU Formula

The following formula calculates the fuel input rate from standard gas flow and matching heating value. Actual flow is corrected to the specified reference pressure and temperature using an ideal-gas estimate.

Q = Fstd × H

where

  • Q is the fuel input rate in Btu per hour
  • F_std is the gas flow rate in standard cubic feet per hour (scfh)
  • H is the heating value in Btu per standard cubic foot (Btu/scf)

Multiply standard gas flow by heating value to obtain Btu per hour. Do not multiply an already-standard flow by pressure. For actual flow, F_std = F_actual × (P_absolute / P_reference) × (T_reference / T_actual), with temperatures in kelvin or rankine.

What is Gas Pressure To BTU?

Gas pressure alone does not determine fuel energy. This calculator relates gas volume flow, heating value and fuel input rate in Btu per hour. Standard flow is already referenced to specified pressure and temperature; actual-flow correction uses absolute pressure and temperature and assumes ideal gas. Match the reference conditions to the heat-value specification. Total energy also requires a duration, and useful heating output requires an efficiency.

How to Calculate Gas Pressure To BTU?

The following steps outline how to calculate the Gas Pressure To BTU.

  1. First, select the value to solve and choose standard or actual volume flow. For actual flow, enter absolute gas pressure and temperature; gauge pressure must first be converted to absolute pressure.
  2. Next, determine the gas volume flow in the selected basis and units.
  3. Next, determine the heating value (H) in BTU per standard cubic foot (BTU/scf).
  4. Finally, calculate fuel input rate using Q = F_std × H. Reference-condition defaults of 14.73 psia and 60 °F are assumptions and can be changed; the pressure inverse uses actual flow and the same ideal-gas relation.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Using standard flow, pressure is not an additional multiplier: Q = 100 × 1000 = 100,000 Btu/h.

Gas Flow Rate (F) = 100 scfh

Heating Value (H) = 1000 BTU/scf