How does the Heating Oil Cost Calculator work?

Annual consumption = floor area (m²) × litres per m² (insulation factor) Then: Poor insulation: ~25L/m²/year, Average: ~18L/m²/year, Good: ~12L/m²/year Then: Cost = annual litres × price per litre Then: Average UK home uses 2,000–3,500 litres per year.

Can you give an example of how to use the Heating Oil Cost Calculator?

Example: Input 100m² average insulation at £0.70/litre gives a result of 1,800 litres/year = £1,260/year.

Is the Heating Oil Cost Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Heating Oil Cost Calculator?

Our Heating Oil Cost Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Heating Oil Cost Calculator

Floor Area (m²)

Oil Price ($/litre)

Insulation Level

A heating oil cost calculator estimates annual fuel consumption and running costs for oil-fired central heating systems. Commonly used in rural UK, Ireland, and parts of North America not connected to mains gas.

Symbol	Name	Unit	Description
DD	Heating degree days	HDD	Cumulative daily (65°F - avg_temp)
gph	Heating rate	gal/hr	Oil furnace consumption rate
needed	Oil needed	gallons	Seasonal consumption estimate

House Size	Poor Insulation	Average	Good Insulation
60 m²	1,500L	1,080L	720L
100 m²	2,500L	1,800L	1,200L
120 m²	3,000L	2,160L	1,440L
150 m²	3,750L	2,700L	1,800L

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Annual heating oil usage and running cost estimator. Formula, worked example and unit conversions included. Instant thermodynamics solver.

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Heating Oil Cost Calculator

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Heating Oil Consumption by Insulation

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