Bedroom Air Conditioner Size Calculator (BTU & kW)

Size your bedroom split‑system quickly. Enter room dimensions, ceiling height, insulation quality, climate and sun exposure. The tool estimates cooling capacity in BTU/h and kW using common rules of thumb. Always check manufacturer guidance and local codes before purchasing.

How to use

1. Choose units (Metric or Imperial).
2. Enter room size (length × width) and ceiling height (defaults to ~2.4 m / 8 ft).
3. Set insulation, climate, and sun exposure.
4. Optionally add occupants and window area to refine the estimate.
5. Click Calculate to see required BTU/h & kW and the nearest standard size.

Worked example

Bedroom 3.6 m × 3.0 m, height 2.4 m, insulation Average, climate Warm/Hot, exposure Sunny PM, occupants 2, windows 1.5 m².

• Base load: 10.8 m² × 125 W/m² ≈ 1,350 W
• Height × climate × sun: × (2.4/2.4) × 1.15 × 1.10 ≈ 1,710 W
• Windows & occupants: + (1.5 × 100) + (1 extra × 175) ≈ 325 W
• Total ≈ 2.0 kW (≈ 6,800 BTU/h) → suggest 2.5 kW split

Bedroom AC sizing calculator

FAQs

What size split system do I need for a bedroom?

Many bedrooms land between 2.0–2.5 kW (≈ 6,800–8,500 BTU/h), but it depends on room size, height, insulation, windows and sun exposure.

Why include ceiling height?

Higher ceilings increase the room volume and cooling load. This tool scales the estimate relative to a standard ~2.4 m (8 ft) height.

Do sunny rooms and big windows need more cooling?

Yes. Afternoon sun and large glazed areas add heat gains, especially in warmer climates. Use the sun/window inputs to account for this.

Is bigger always better?

Oversized units can short‑cycle and feel clammy. Aim for a capacity that meets or slightly exceeds the calculated need, then confirm with manufacturer sizing tables.