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AC Size (PK) Calculator per Room
Calculate the BTU need and recommended AC size (PK) for a room from area, ceiling height, and load factor. Free.
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An early-planning estimate; final design & permit compliance (PBG) should be done or verified by a competent architect/engineer.
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Visit StoreUnderstanding PK & BTU
BTU & PK
BTU (British Thermal Unit) measures AC cooling capacity. PK is a market unit referencing BTU: ½ PK ≈ 5,000 BTU, 1 PK ≈ 9,000 BTU, 2 PK ≈ 18,000 BTU. Bigger rooms need more BTU/PK.
Need per m²
A common guide is ~500–600 BTU per m² of room area. A 16 m² room needs about 8,000–9,600 BTU, pointing to about 1 PK. This value is adjustable in the calculator.
Load factor
Rooms in direct sun, with high ceilings, many people, or near a kitchen absorb more heat — needing more BTU than area alone suggests.
FAQ
Frequently asked questions
What AC size (PK) for my room?
Multiply room area by ~500–600 BTU/m², adjust for load factor (sun, high ceiling, kitchen), then match to the nearest PK above. A 16 m² room needs ~8,000–9,600 BTU → about 1 PK.
How do I calculate a room's BTU need?
BTU ≈ area (m²) × 500–600 × load factor. If the ceiling is above 3 m, add proportionally since air volume grows. The calculator computes this automatically from your input.
What if the AC PK is too small or too big?
An undersized AC runs constantly, wastes power, and never cools. An oversized one cools fast but cycles on/off, is less efficient, and can leave the room humid. Choose the right PK.
Is 1 PK always enough for a bedroom?
Not always. 1 PK (~9,000 BTU) usually suits a ~14–18 m² room with normal load. Larger, sun-exposed, or high-ceiling rooms may need 1½ PK or more. Compute for your room's conditions.
Does this estimate account for electrical efficiency?
The calculator focuses on cooling capacity (BTU/PK). For power savings, pick an inverter, energy-labeled AC at the right PK. Correctly sizing the AC is the first efficiency step.
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