📐 Room Volume Calculator
Knowing the volume of a room is essential for a wide range of DIY projects — from choosing the right size heater or air conditioner to planning ventilation systems and even estimating paint coverage. Our Room Volume Calculator helps you work out the cubic metres of any space in seconds.
Whether you're a tradesperson planning a heating installation, a DIYer working out how much air purifier capacity you need, or a homeowner calculating room volume for energy efficiency improvements, this calculator gives you the accurate measurement you need. We also include a wastage allowance for irregular shapes and cuts.
What our room volume calculator does:
- 📏 Room Dimensions — Enter length, width, and height in metres or centimetres.
- 📐 Irregular Shapes — Add deductions for alcoves, bay windows, and other irregularities.
- 📊 Volume Output — Get volume in cubic metres (m³).
- 📋 Project Planning — Essential for HVAC, heating, cooling, and ventilation projects.
💡 Pro Tip: For heating and cooling calculations, multiply the room volume by the recommended wattage per cubic metre (typically 30-40W per m³ for UK homes). This is the first step in planning any heating or cooling system.