How do I use the oil tank sizing calculator?

Enter your design inputs below and click Calculate. The tool applies UK building services methods for oil tank sizing and reports results with assumptions.

What standard applies to oil tank sizing?

Confirm the relevant British Standard or Approved Document on your project. This calculator is for first-pass sizing — verify against the issued specification before sign-off.

Can I save oil tank sizing results in BuildFlo?

Sign up for a free BuildFlo account to save calculation results in your project workspace and attach them to your calculation folder.

BuildFlo Design Guide · Thermal · Thermal

oil tank sizing calculator for UK building services

Fuel oil storage from boiler/generator output, days and hours. Free UK oil tank sizing calculator with thermal guidance.

What this calculator does

Oil tank sizing helps UK building services engineers with fuel oil storage from boiler/generator output, days and hours. The calculation follows Thermal methods used in everyday MEP design — enter your project inputs below for a first-pass result.

Whether you searched for "oil tank sizing", "oil tank sizing calculator", or "how to oil tank size", this page gives you a working tool plus the context to use it on a real job.

When to use it

Use this for early-stage sizing and sanity checks on UK building services work. It is not a substitute for issued calculations — verify against the project specification, drawings, and relevant standard before sign-off.

How to use it

1. Fill in the inputs for your scenario (defaults are starting points only). 2. Click Calculate — results include the method and assumptions where applicable. 3. Verify against the project specification and relevant standard before issuing.

Typical output unit: litres.

Tips

Defaults are indicative — replace with project-specific values from the architect, structural, or MEP spec.
For issued calculations, save results in your BuildFlo project and attach to the calculation folder.
Need the regulation citation? Open BuildFlo chat in the app and ask about oil tank sizing under UK standards.

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*Sign up for BuildFlo for the full calculator suite, saved results, and project workspace.*

Frequently asked questions

How do I use the oil tank sizing calculator?: Enter your design inputs below and click Calculate. The tool applies UK building services methods for oil tank sizing and reports results with assumptions.
What standard applies to oil tank sizing?: Confirm the relevant British Standard or Approved Document on your project. This calculator is for first-pass sizing — verify against the issued specification before sign-off.
Can I save oil tank sizing results in BuildFlo?: Sign up for a free BuildFlo account to save calculation results in your project workspace and attach them to your calculation folder.