Air Conditioner Sizing Guide: Sizing Chart (BTU & Ton)


Rule of thumb is a great way to size an air conditioner most of the time. However, one calculation method can’t be used for all applications. Thus, I created multiple sizing charts for the most common applications so that people can quickly find the suitable air conditioner size.

To calculate air conditioner size, multiply the length of the room by the width of the room to get the square footage of the room. Then, multiply the square footage by 25-50 btu/hr.sqft according to the application to obtain the cooling capacity needed. Finally, match the air conditioner size with the required cooling capacity.

Following are a series of air conditioner sizing charts for different applications from bedrooms and living rooms to apartments and mobile homes. My recommended air conditioner sizes are based on the following criteria:

  • Based on adjusted rule of thumb according to my research and experience
  • Room sizes are common and typical for most places
  • Square footages are approximated and averaged
  • Resulted air conditioner sizes are actual capacity available in the market

With that said, you may find the suitable air conditioner size using one or more of the following sizing chart(s).

Table of Contents

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Common Residential Air Conditioner Sizes

Below is a table of common residential air conditioner sizes in 4 different units of measurement for cooling capacity (BTU, Ton, HP and kW). These different units of measurement don’t translate mathematically. They are listed based on commonly available sizes. Hence, you should not use this table for unit conversion.

BTUTonHPkW
50000.51.5
60000.5
8000
90000.7512.5
10000
1200011.53.5
150004.5
180001.525
2400022.57.1
300002.539
Common residential air conditioner sizes

Common Central Air Conditioner Sizes

Below is a table of common central air conditioner sizes in 4 different units of measurements for cooling capacity (BTU, Ton, HP and kW). Again, these different units of measurement don’t translate mathematically. They are listed based on commonly available sizes. Hence, you also should not use this table for unit conversion.

BTUTonHPkW
3600033.510.5
400003.5412.5
450004.5
480004514
540004.516
6000056
720006
760006.5822.4
840007
900007.5
9500081028
Common central air conditioner sizes

Room Air Conditioner Sizing Chart by Room Size

Below is a room air conditioner sizing chart by room size. The air conditioner sizes (BTU & Ton) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on your room size.

Room Size (ft) BTUTon
10 x 1050000.5
10 x 1250000.5
12 x 1250000.5
12 x 1450000.5
12 x 1550000.5
14 x 1460000.5
15 x 1580000.75
15 x 2090000.75
16 x 1680000.95
20 x 20120001
Room air conditioner size by room size

Room Air Conditioner Sizing Chart for Bedrooms

Below is a room air conditioner sizing chart for bedrooms. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on your bedroom size.

BedroomSize (ft)BTU
Small Bedroom10 x 105000
Small Bedroom10 x 125000
Small Bedroom12 x 125000
Large Bedroom15 x 209000
Large Bedroom20 x 2012000
Master Bedroom12 x 155000
Master Bedroom14 x 146000
Master Bedroom15 x 156000
Master Bedroom16 x 168000
Room air conditioner size for bedrooms

Room Air Conditioner Sizing Chart by Room Type

Below is a room air conditioner sizing chart by room type. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on your type of room and its respective square footage.

RoomSquare FootageBTU
Small Room1005000
Small Room1205000
Small Room1445000
Large Room3009000
Large Room40012000
Basement65218000
Basement85024000
Basement150040000
Living Room2166000
Living Room3199000
Living Room3309000
Living Room3409000
Living Room39312000
Living Room61618000
Kitchen1036000
Kitchen1618000
Kitchen2389000
Room air conditioner size by room type

Air Conditioning Sizing Chart by Total Square Footage

Below is an air conditioner sizing chart by total square footage. The air conditioner sizes (BTU & Ton) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the square footage of any room, house or home.

Square FootageBTUTon
10050000.5
12050000.5
14450000.5
15050000.5
20060000.5
22560000.5
24080000.75
25080000.75
28890000.75
30090000.75
32090000.75
35090000.75
36090000.75
400120001
450120001
480150001.5
500150001.5
550150001.5
600150001.5
650180001.5
700180001.5
750180001.5
800240002
850240002
900240002
1000240002
1100300002.5
1200300002.5
1300300002.5
1400360003
1500360003
1600400003.5
1650400003.5
1700450003.5
1750450003.5
1800450003.5
1900480004
2000480004
2100540004.5
2200540004.5
2300540004.5
2400600005
2500600005
2600600005
2700720006
2800720006
2900720006
3000720006
3100720006
3200720006
3400840007
3500840007
3600840007
3700840007
3800900007.5
4000900007.5
5000950008
Air conditioner size by total square footage

Central Air Conditioner Sizing Chart for Homes by Total Square Footage

Below is a room air conditioner sizing chart for homes by total square footage. The air conditioner sizes (BTU & Ton) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on your home size.

Home Size (sqft)BTUTon
1000240002
1200300002.5
1300360003
1500400003.5
1600400003.5
1700450003.5
2000480004
2200540004.5
2400600005
2500600005
2800720006
3000720006
Central air conditioner size for homes by total square footage

Air Conditioner Sizing Chart for Houses by No. of Bedroom

Following are air conditioner sizing charts for houses by no. of bedroom. A house can either use central or room air conditioners depending on your preference.

Central Air Conditioner Size for Houses

Below is a central air conditioner sizing chart for houses. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the square footage of your house.

HouseSquare FootageBTU
2 Story125036000
3 Bedroom165048000
4 Bedroom190060000
4 Bedroom240072000
Central air conditioner size for houses by no. of bedroom

Room Air Conditioner Size for a 2-Story House

Below is a room air conditioner sizing chart for a 2-story house. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the type of room and its respective square footage.

2 Story HouseSquare FootageBTU
Living Room2166000
Bedroom 11445000
Bedroom 21205000
Kitchen1618000
Master Bedroom1805000
Study Room1005000
Hall Area2166000
Total113740000
Room air conditioner size for a 2-story house

Room Air Conditioner Size for a 3-Bedroom House

Below is a room air conditioner sizing chart for a 3-bedroom house. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the type of room and its respective square footage.

3 Bedroom HouseSquare FootageBTU
Living Room3199000
Dining Room2165000
Kitchen1618000
Master Bedroom1966000
Bedroom 21205000
Bedroom 31205000
2 Car Garage44012000
Total157250000
Room air conditioner size for a 3-bedroom house

Room Air Conditioner Size for 4-Bedroom Houses

Below are room air conditioner sizing charts for 4-bedroom houses (2000 sqft and 2400 sqft). The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the type of room and its respective square footage.

4 Bedroom HouseSquare FootageBTU
Living Room3199000
Dining Room2166000
Kitchen1618000
Master Bedroom2256000
Bedroom 21445000
Bedroom 31445000
Bedroom 41445000
Hall Area2166000
2 Car Garage48415000
Total205365000
Room air conditioner size for a 4-bedroom house
4 Bedroom HouseSquare FootageBTU
Living Room3199000
Dining Room2166000
Kitchen1618000
Master Bedroom2256000
Bedroom 21205000
Bedroom 31205000
Bedroom 41445000
Hall Area2166000
3 Car Garage70418000
Rear Porch2166000
Total244174000
Room air conditioner size for a typical 4-bedroom house

Air Conditioner Sizing Chart for Apartments by No. of Bedroom

Below is an air conditioner sizing chart for apartments by no. of bedroom. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the square footage.

ApartmentSquare FootageBTU
Small47212000
Studio47212000
1 Bedroom71418000
2 Bedroom100630000
Total air conditioner size for apartments by no. of bedroom

Room Air Conditioner Size for a 1-Bedroom Apartment

Below is a room air conditioner sizing chart for a 1-bedroom apartment. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the type of room and its respective square footage.

1 Bedroom ApartmentSquare FootageBTU
Living Room3199000
Kitchen1036000
Bedroom1966000
Total61821000
Room air conditioner size for a 1-bedroom apartment

Room Air Conditioner Size for a 2-Bedroom Apartment

Below is a room air conditioner sizing chart for a 2-bedroom apartment. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the type of room and its respective square footage.

2 Bedroom ApartmentSquare FootageBTU
Living Room3409000
Kitchen1618000
Master Bedroom2256000
Bedroom 21445000
Total87028000
Room air conditioner size for a 2-bedroom apartment

Room Air Conditioner Sizing Chart for Garages by No. of Car

Below is a room air conditioner sizing chart for garages by no. of car (insulated and non-insulated). The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on how many cars and the respective square footage.

Garage
(Insulated)
Square FootageBTU
1 Car1625000
1 Car2408000
1 Car3369000
1 Car38412000
2 Car36012000
2 Car40012000
2 Car44012000
2 Car48415000
3 Car70424000
3 Car98830000
3 Car120036000
Room air conditioner size for insulated garages by no. of car
Garage
(Non-Insulated)
Square FootageBTU
1 Car1628000
1 Car24012000
1 Car33615000
1 Car38418000
2 Car36018000
2 Car40018000
2 Car44024000
2 Car48424000
3 Car70436000
3 Car98848000
3 Car120054000
Room air conditioner size for garages by no. of car

Room Air Conditioner Sizing Chart for RVs by Type & Size

Below is a room air conditioner sizing chart for RVs by type & size. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the type of RV and the respective size.

RVSize (ft)BTU
Pop Up Camper10 x 125000
Pop Up Camper7 x 165000
Pop Up Camper7 x 185000
Pop Up Camper7 x 226000
Travel Trailer8 x 289000
Travel Trailer8 x 329000
Travel Trailer8 x 349000
Travel Trailer8 x 3812000
Room air conditioner size for RVs by type & size

Air Conditioner Sizing Chart for Mobile Homes by Type & Size

Following are air conditioner sizing charts for mobile homes by type & size. A mobile can either use central or room air conditioners depending on your preference.

Central Air Conditioner Size for Single-Wide Mobile Homes

Below is a central air conditioner sizing chart for single-wide mobile homes. The air conditioner sizes (BTU & Ton) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the size of the mobile home.

Single Wide (ft)BTUTon
14 x 60240002
14 x 70300002.5
14 x 80360003
16 x 60300002.5
16 x 70360003
16 x 80400003.5
18 x 60360003
18 x 70400003.5
18 x 80450003.5
Central air conditioner size for single-wide mobile homes

Central Air Conditioner Size for Double-Wide Mobile Homes

Below is a central air conditioner sizing chart for double-wide mobile homes. The air conditioner sizes (BTU & Ton) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the size of the mobile home.

Double Wide (ft)BTUTon
24 x 60400003.5
24 x 70480004
24 x 80540004.5
28 x 60480004
28 x 70540004.5
28 x 80600005
32 x 60540004.5
32 x 70600005
32 x 80720006
Central air conditioner size for double-wide mobile homes

Room Air Conditioner Size for a Single-Wide Mobile Home

Below is a room air conditioner sizing chart for single-wide mobile homes. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the size of the mobile home.

Single-WideSquare FootageBTU
Living Room2358000
Dining Room2219000
Master Bedroom1805000
Bedroom 21365000
Bedroom 3845000
Total85632000
Room air conditioner size for a single-wide mobile home

Room Air Conditioner Size for a Double-Wide Mobile Home

Below is a room air conditioner sizing chart for double-wide mobile homes. The air conditioner sizes (BTU) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on the size of the mobile home.

Double-WideSquare FootageBTU
Living Room2678000
Dining Room1808000
Kitchen1618000
Master Bedroom2106000
Bedroom 21195000
Bedroom 31195000
Bedroom 41175000
Bedroom 51195000
Total129250000
Room air conditioner size for a double-wide mobile home

Yu Chang Zhen

Yu was working in the air conditioning industry for the past 7 years, covering from design to installation and maintenance. Yu wish to share all the things he learned with the people around the world.

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