Towel Radiator BTU Calculator (UK) – How Much Heat Do You Need?

Choosing the correct BTU (British Thermal Units) ensures your towel radiator heats your bathroom properly.

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📏 How to Calculate BTU

Step-by-step:

1. Measure room (metres)

2. Multiply length × width × height

3. Multiply result by 50

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🏠 UK Adjustments

Add extra BTU if:

• External wall (+10–15%)

• Poor insulation (+20%)

• Large windows (+10%)

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🔗 Related:

• See our Towel Radiator Size Guide UK for sizing advice

• Calculate your bathroom BTU with our BTU Calculator