Tons to BTU Converter
Convert refrigeration tons to BTU per hour and BTU/hr to tons. Essential for AC sizing, cooling load calculations, and HVAC system design.
1 Ton = 12,000 BTU/hr | 1 BTU/hr = 0.0000833 Tons
Tons ↔ BTU/hr Calculator
Quick conversions (common AC sizes):
Tons to BTU Conversion Table
| Tons | BTU/hr | kW | Sq Ft Coverage | Typical Use |
|---|---|---|---|---|
| 0.5 | 6,000 | 1.8 | 200-300 sq ft | Window unit, single room |
| 1 | 12,000 | 3.5 | 400-600 sq ft | Mini-split, small apartment |
| 1.5 | 18,000 | 5.3 | 600-900 sq ft | Large room, studio |
| 2 | 24,000 | 7.0 | 800-1,200 sq ft | Small home, apartment |
| 2.5 | 30,000 | 8.8 | 1,200-1,500 sq ft | Medium home |
| 3 | 36,000 | 10.6 | 1,500-2,100 sq ft | Average home |
| 3.5 | 42,000 | 12.3 | 1,800-2,400 sq ft | Larger home |
| 4 | 48,000 | 14.1 | 2,000-2,800 sq ft | Large home |
| 5 | 60,000 | 17.6 | 2,500-3,500 sq ft | Large home / light commercial |
| 7.5 | 90,000 | 26.4 | 3,500-5,000 sq ft | Small commercial |
| 10 | 120,000 | 35.2 | 5,000-7,000 sq ft | Commercial building |
| 15 | 180,000 | 52.8 | 7,000-10,000 sq ft | Large commercial |
| 20 | 240,000 | 70.3 | 10,000-14,000 sq ft | Large commercial / industrial |
How to Size an AC System Using Tons and BTU
Step 1: Calculate Square Footage
Measure the total area to be cooled. Multiply length × width for each room and add them together.
Step 2: Estimate Tonnage
Divide square footage by 500 for a rough estimate. Example: 2,000 sq ft ÷ 500 = 4 tons = 48,000 BTU/hr.
Adjustment Factors
• Hot climate (AZ, TX, FL): add 10-20%
• Poor insulation: add 10-15%
• Many windows / sun exposure: add 10%
• High ceilings (>9 ft): add 10%
Common Residential Sizes
• 1-bedroom apt: 1-1.5 tons (12-18k BTU)
• 3-bedroom home: 2.5-3.5 tons (30-42k BTU)
• 4-bedroom home: 3-5 tons (36-60k BTU)
• Large custom home: 5+ tons (60k+ BTU)
Frequently Asked Questions
How many BTU is 1 ton of air conditioning?
1 ton of air conditioning equals 12,000 BTU per hour. The term "ton" comes from the amount of energy needed to melt one short ton (2,000 lbs) of ice in 24 hours. A 1-ton AC unit removes 12,000 BTU of heat from the space every hour.
How many BTU is a 3 ton AC?
A 3-ton AC equals 36,000 BTU/hr (3 × 12,000). This is the most popular residential size, suitable for homes around 1,500-2,100 square feet. It equals 10.55 kW of cooling capacity.
How many tons do I need for a 2,000 sq ft house?
A 2,000 sq ft house typically needs 3-4 tons (36,000-48,000 BTU/hr). Use the rule of thumb: 1 ton per 400-600 sq ft. In hot climates or poorly insulated homes, lean toward 4 tons. In mild climates with good insulation, 3 tons may suffice.
What happens if my AC is too many tons for the space?
An oversized AC short-cycles — it cools the air quickly but shuts off before removing humidity, leaving the space clammy and uncomfortable. It also wastes energy and wears out the compressor faster. Proper sizing is critical for comfort and efficiency.
Is a "ton" of AC the same as a ton of weight?
No. A refrigeration ton measures cooling capacity, not weight. It originated from ice harvesting: the energy to melt 1 ton (2,000 lbs) of ice over 24 hours = 288,000 BTU/day = 12,000 BTU/hr. The AC unit itself weighs much less than a ton.
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