AC Cooling Capacity Calculator
Convert AC tonnage to BTU/hr, cooling watts, and kW with this free online calculator. Calculate the approximate cooling capacity of an air conditioner from its tonnage. Convert between tons, BTU/hr, cooling watts, and cooling kW using standard cooling-capacity conversions.
AC Capacity Conversion
Enter an AC capacity in any unit to see its equivalent cooling power across all standard metrics.
1.5 Ton Air Conditioner
Cooling capacity (heat removal), NOT electrical power consumption.
1.5 Ton
18,000 BTU/hr
≈ 5,275 W
≈ 5.275 kW
Conversion Flow
1.5 Ton
18,000 BTU/hr
≈ 5,275 W
≈ 5.275 kW
1.5 Ton × 3,516.85 ≈ 5,275 W cooling
AC Capacity Guide
Standard residential and commercial AC cooling capacities and their corresponding cooling wattage.
| AC Tonnage | BTU / Hour | Approx. Cooling Watts | Approx. Cooling kW | Typical Room Size |
|---|---|---|---|---|
0.5 Ton | 6,000 BTU/hr | ≈ 1,758 W | ≈ 1.758 kW | Up to 100 sq ft |
0.8 Ton | 9,600 BTU/hr | ≈ 2,813 W | ≈ 2.813 kW | Up to 100 sq ft |
1.0 Ton | 12,000 BTU/hr | ≈ 3,517 W | ≈ 3.517 kW | 100 - 130 sq ft |
1.2 Ton | 14,400 BTU/hr | ≈ 4,220 W | ≈ 4.22 kW | 130 - 180 sq ft |
1.5 TonCurrent | 18,000 BTU/hr | ≈ 5,275 W | ≈ 5.275 kW | 130 - 180 sq ft |
1.8 Ton | 21,600 BTU/hr | ≈ 6,330 W | ≈ 6.33 kW | 180 - 260 sq ft |
2.0 Ton | 24,000 BTU/hr | ≈ 7,034 W | ≈ 7.034 kW | 180 - 260 sq ft |
2.5 Ton | 30,000 BTU/hr | ≈ 8,792 W | ≈ 8.792 kW | 260 - 400 sq ft |
3.0 Ton | 36,000 BTU/hr | ≈ 10,551 W | ≈ 10.551 kW | 260 - 400 sq ft |
Click any row to load that tonnage directly into the calculator.
About AC Cooling Capacity Calculator
The AC Cooling Capacity Calculator is a specialized HVAC engineering converter designed to instantly bridge the gap between regional refrigeration measurement standards. Whether sizing a split AC unit for a bedroom, evaluating a commercial chiller, or cross-referencing manufacturer specification sheets, this tool converts between Tons of Refrigeration (TR), British Thermal Units per hour (BTU/hr), Cooling Watts (W), and Cooling Kilowatts (kW).
Historically, air conditioning capacities were derived from the cooling power provided by melting a short ton (2,000 pounds) of ice over a 24-hour window, which equates to 12,000 BTU/hour or approximately 3,517 cooling watts. Our calculator applies exact thermodynamic ratios so homeowners, HVAC technicians, architects, and facilities managers can quickly verify cooling capacity ratings worldwide.
Why Use an AC Cooling Capacity Calculator?
Cooling capacity is the rate of heat removed from a room, not the electrical electricity consumption on your meter. Converting to standard cooling watts clarifies how powerful an AC is without confusing it with input power.
North America predominantly rates equipment in Tons and BTU/hr, while Europe, Japan, and international standards often specify cooling output in kW or Watts. This tool eliminates conversion errors across global spec sheets.
An undersized AC runs constantly without cooling effectively, while an oversized unit short-cycles and leaves humidity behind. Knowing exact BTU and kW equivalents ensures you choose the ideal capacity for your room dimensions.
Evaluating air conditioning loads is the first step in sizing home inverters, solar battery banks, and generators. Converting tons to standard wattage metrics gives you the baseline capacity needed for load analysis.
How AC Cooling Capacity Is Calculated
In thermodynamics and HVAC engineering, 1 Ton of refrigeration (TR) is conventionally defined as the rate of heat transfer required to freeze 1 short ton (2,000 lbs) of pure water at 0°C into ice in 24 hours.
1 Ton of Refrigeration = 12,000 BTU/hr
1 BTU/hr ≈ 0.29307107 Watts
12,000 × 0.29307107 ≈ 3,516.85284 W ≈ 3,517 W of cooling capacity
Therefore, the standard conversion formulas used by this calculator are:
- Cooling Watts:
Cooling Watts = AC Tons × 12,000 × 0.293071orCooling Watts = AC Tons × 3,516.85 - Cooling kW:
Cooling kW = Cooling Watts ÷ 1,000 - BTU/hr:
BTU/hr = AC Tons × 12,000
Important: Cooling Capacity ≠ Electrical Power Consumption
Cooling capacity and electrical power consumption are fundamentally different measurements. For example, 1 ton of cooling is approximately 3,517 watts of cooling capacity. This does NOT mean a 1-ton AC continuously consumes 3,517 watts of electricity from your power grid.
Air conditioners act as heat pumps rather than resistive heaters. Their actual electrical power consumption is typically much lower (often between 800 W to 1,500 W for a modern 1-ton inverter AC) depending on the unit’s Energy Efficiency Ratio (EER/ISEER), ambient temperature, compressor speed, room insulation, and operating settings.
Common AC Cooling Capacities
≈ 6,000 BTU/hr
≈ 1.76 kW cooling
≈ 9,600 BTU/hr
≈ 2.81 kW cooling
≈ 12,000 BTU/hr
≈ 3.52 kW cooling
≈ 18,000 BTU/hr
≈ 5.28 kW cooling
≈ 24,000 BTU/hr
≈ 7.03 kW cooling
≈ 36,000 BTU/hr
≈ 10.55 kW cooling
Frequently Asked Questions
Disclaimer:
This calculator provides approximate AC cooling-capacity conversions based on standard refrigeration units. Cooling capacity is not the same as electrical power consumption. Actual AC performance and electricity usage vary by model, efficiency, operating conditions, and system design.
This calculator runs entirely inside your web browser. Thermodynamic calculations and cooling ratings are computed client-side with zero data transmission.
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