Live burn model

Seasoned wood logs

1.2 kW

Room

48 m³

Useful heat

4.9 kWh

Result

Below target

Fuel moisture20%

Room temperature forecast

Indicative model; ventilation, thermal mass and fire control change the result.

15.8°C
0h4hideal 20.5°C
Carbon output
Fossil CO₂
0 kg
Biogenic CO₂
6.6 kg
Supply-chain CO₂e
0.2 kg

Fuel for target

2.4 kg

Fossil CO₂

0 kg

Biogenic CO₂

6.6 kg

Supply-chain CO₂e

0.2 kg

What the carbon figures mean

Fossil CO₂ is released from coal, gas, LPG and oil. Wood and charcoal show biogenic CO₂ separately: it still enters the atmosphere at the chimney, while regrowth and sourcing determine the longer-term climate effect. Supply-chain CO₂e estimates processing and transport.

Combustion safety

Particulate risk is high. Use only a correctly installed, vented appliance with a working carbon-monoxide alarm. Never burn coal or charcoal in an open, unventilated room.

Calcurly.com area calculator showing dimensions, result, and cost breakdown

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About this calculator

Set the room volume, insulation, temperatures, fuel amount, burn time and appliance efficiency. The live model separates fossil, biogenic and supply-chain carbon and shows whether the fire is likely to reach a comfortable 20–21°C target.

Frequently asked questions

What does the Fireplace, Fuel & Room Heating Calculator do?
Compare wood, coal, pellets, gas, LPG, oil and charcoal by useful heat, room-temperature rise, carbon output and indoor air-quality risk. Set the room volume, insulation, temperatures, fuel amount, burn time and appliance efficiency. The live model separates fossil, biogenic and supply-chain carbon and shows whether the fire is likely to reach a comfortable 20–21°C target.
Is the Fireplace, Fuel & Room Heating Calculator free to use?
Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.
How accurate is the Fireplace, Fuel & Room Heating Calculator?
Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified hvac & climate professional before committing to a purchase or a job.
Can I embed the Fireplace, Fuel & Room Heating Calculator on my own website?
Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.

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