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Free biomass energy yield calculator: enter annual dry mass (metric tonnes per year) and higher heating value (MJ per kg) to get thermal MJ, GJ, and MWh per year. Optionally apply a single net electric efficiency percent for a rough MWh_e screening.
Last updated: April 18, 2026
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Use moisture-corrected dry mass consistent with your HHV basis.
Typical woody fuels often ~17–21 MJ/kg; herbaceous residues vary widely.
Set to 0 to hide electricity; otherwise rough MWh_e = thermal MWh × efficiency.
Dry mass: 500,000 kg
9,250,000 MJ / yr
9,250 GJ / yr · 2,569.44 MWh_th / yr
Approx. electric (screening)
719.44 MWh_e / yr
Planning note
HHV
Species-dependent
Use consistent moisture and ash reporting with your lab HHV.
Variability
Wide HHV range
Run sensitivity cases on HHV when data are sparse.
Throughput
Tonnes per year supply
Align harvest year with annual yield in the form.
Caution
One number cannot capture CHP
Combined heat and power needs separate thermal and electric accounting.
Consistency
Match HHV basis
As-received vs dry tons must align with the HHV you enter.
Next
Offsets and inventories
Pair energy yield with lifecycle and regulatory tools for reporting.
500 t dry / yr × 18.5 MJ/kg HHV; 28% electric efficiency:
Thermal GJ / yr
9,250
Thermal MWh / yr
2,569.44
Electric MWh / yr (screen)
719.44
Total thermal energy in megajoules per year equals dry mass in kilograms times HHV in megajoules per kilogram. Gigajoules divide megajoules by 1000. Megawatt-hours of energy divide megajoules by 3600 because one megawatt-hour equals exactly 3600 megajoules. Optional electric megawatt-hours multiply thermal megawatt-hours by the efficiency percentage divided by 100.
kg = metric_tonnes × 1000MJ_yr = kg × HHV_MJ/kgGJ_yr = MJ_yr / 1000MWh_th_yr = MJ_yr / 3600MWh_e_yr ≈ MWh_th_yr × (efficiency / 100)Boilers, gasifiers, and digesters need plant-specific balances
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