Flame Calculators
Adiabatic Flame Temperature Calculator
Calculate the adiabatic flame temperature of a fuel-air mixture from heating value, air-fuel ratio, and specific heat of combustion products.
Bunsen Burner Flame Cone Angle Calculator
Calculate a Bunsen burner flame cone's half-angle from laminar burning velocity and jet velocity.
Candle Flame Heat Output Calculator
Calculate how many watts of heat a candle flame produces from its wax burn rate and heating value.
Flame Color Temperature Estimator
Estimate a blackbody-equivalent temperature from flame color using Wien's Displacement Law, with caveats on chemiluminescence.
Flame Emissivity Calculator
Estimate flame emissivity from absorption coefficient and optical path length using the Beer-Lambert relation.
Flame Front Expansion Velocity Calculator
Calculate the observed flame front velocity from laminar burning velocity and the unburned-to-burned gas expansion ratio.
Flame Length Calculator
Estimate visible flame length above a burner or fire source using the Heskestad flame height correlation based on heat release rate and diameter.
Flame Quenching Distance Calculator
Calculate the minimum gap distance that stops flame propagation, used for flame arrestor and safety screen design.
Flame Radiative Heat Loss Calculator
Calculate radiative heat loss from a flame using the Stefan-Boltzmann law, flame emissivity, temperature, and radiating surface area.
Flame Reaction Zone Residence Time Calculator
Calculate how long a gas parcel spends in a flame's reaction zone from flame thickness and laminar burning velocity.
Flame Speed Calculator
Calculate laminar flame speed at different unburned gas temperatures and pressures using the standard power-law scaling correlation.
Flame Stability Calculator
Calculate the flame stability ratio between flow velocity and flame speed to assess flashback and blow-off risk in burners.
Flame Temperature Calculator
Calculate the actual flame temperature after accounting for the cooling and dilution effect of excess combustion air.
Flashback Velocity Margin Calculator
Check a burner's flashback safety margin by comparing unburned gas jet velocity against laminar burning velocity.
Ignition Energy Calculator
Calculate minimum ignition energy (MIE) of a fuel-air mixture at elevated pressure from its reference MIE at 1 atm.
Laminar Burning Velocity Calculator
Calculate temperature-corrected laminar burning velocity from a reference value using the standard power-law correction used in combustion engineering.
Laminar Flame Thickness Calculator
Estimate laminar flame thickness from thermal diffusivity and burning velocity using the standard preheat-zone balance formula.
Pilot Flame Heat Output Calculator
Calculate the heat output of a pilot flame from fuel mass flow rate and lower heating value.
Spherical Flame Stretch Rate Calculator
Calculate the stretch rate of an expanding spherical flame from laminar burning velocity and flame radius, as used in combustion bomb experiments.
Turbulent Flame Speed Calculator
Calculate turbulent flame speed from laminar burning velocity and turbulence intensity using Damkohler's classic additive model.
The Hottest Part of Any Combustion Process
A flame's temperature, speed, and stability determine everything from burner design to whether a flame stays lit at all under changing conditions. These six calculators cover flame-specific combustion physics.
Flame Temperature Varies Enormously by Fuel
| Fuel | Approx. Flame Temperature |
|---|---|
| Natural Gas (Methane) | ~1,950°C |
| Hydrogen | ~2,100°C |
| Acetylene | ~2,500°C |
This is exactly why acetylene, not natural gas, is the standard choice for oxy-fuel cutting and welding torches — the extra several hundred degrees makes a practical difference for cutting through metal. Adiabatic flame temperature assumes no heat loss to surroundings, so real measured flame temperatures typically run somewhat below these theoretical maximums. Calculate your own fuel and conditions with the Adiabatic Flame Temperature Calculator.
Popular Flame Calculators
- Flame Speed Calculator — estimates how fast a flame front propagates through a given fuel-air mixture.
- Flame Stability Calculator — assesses whether a flame will stay lit under given flow and mixture conditions.
- Ignition Energy Calculator — finds the minimum energy needed to ignite a given fuel-air mixture.
Related: Advanced Combustion Calculators, Burner Calculators for the equipment that shapes and sustains a flame.