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AC Tonnage & Room Size Calculator

Get estimated BTU, recommended tons and monthly energy use guidance.

Enter room details

This is an estimate for guidance. For precise HVAC load calculations consult a qualified technician.

Fill required fields and tap Calculate.

Length (ft)

Width (ft)

Ceiling height (ft)

Occupants

Window count

Avg window area (sq ft)

Heat-generating appliances (count)

Insulation quality Good Average Poor

Region / climate Cool Temperate Hot & Dry Hot & Humid

Daily usage (hrs) — energy calc

1 ton = 12,000 BTU

How is AC tonnage calculated?+

Start with area × ~20 BTU/sq ft, add for occupants, appliances and windows, apply insulation/climate multipliers and divide by 12,000 to get tons.

Should I oversize the AC?+

No — oversizing can lead to short-cycling and poor humidity control. Use a properly sized inverter split.

Total cooling (BTU)

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BTU per hour

Tonnage

—

1 ton = 12,000 BTU

Suggested unit

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Common standard capacity

Breakdown

Estimated monthly energy

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Disclaimer: Estimates only. For accurate HVAC load calculations (ducting, multi-zone systems, local codes), consult a certified HVAC engineer.

AC Tonnage Calculator – Find the Right AC Size & Calculate Running Cost

Meta Title: AC Tonnage Calculator | Find Right AC Size & Power Consumption Cost
Meta Description: Calculate the ideal AC tonnage for your room and estimate running cost. Use our AC Tonnage Calculator to find the perfect air conditioner size for your home or office.
Focus Keywords: AC Tonnage Calculator, AC Size Calculator, Air Conditioner Capacity, AC Power Consumption, AC Running Cost, Best AC for Room Size, Split AC Size Guide

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Introduction: Why AC Sizing Matters

Choosing the right air conditioner is not just about brand or looks — it’s about efficiency, comfort, and energy savings. If your AC is too small, it will run constantly, raising your electricity bill without cooling effectively. If it’s too large, it will cool too quickly without dehumidifying, causing uneven temperature and waste of power.

That’s where the AC Tonnage Calculator comes in — a smart, data-based way to find your perfect AC capacity based on your room size, number of people, heat load, and region.

By the end of this guide, you’ll know:

• How to calculate your ideal AC tonnage
• How to estimate your monthly running cost
• Tips to choose the right AC type
• How to save power without sacrificing comfort

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What is AC Tonnage? (Simple Explanation)

The term “tonnage” in air conditioning doesn’t mean weight — it refers to the cooling capacity.

1 ton of cooling = 12,000 BTUs per hour (British Thermal Units).
In simple terms, 1 ton AC can remove heat equivalent to melting one ton of ice in 24 hours.

Tonnage vs Room Size

Room Size (sq ft)	Ideal AC Size	Recommended Type
0–100 sq ft	0.8 – 1 ton	Split / Window
100–150 sq ft	1 – 1.2 ton	Split AC
150–200 sq ft	1.5 ton	Split / Inverter
200–250 sq ft	2 ton	Inverter Split
250+ sq ft	2.5 – 3 ton	Multi-split / VRF

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How to Calculate the Right AC Tonnage (Manually)

You can calculate the right tonnage with a simple formula based on room area, number of people, and heat load.

Formula:

Required BTU = (Room Area in sq. ft × 25) + (Number of People × 600) + (Windows × 1000)

Then,

Tonnage = Total BTU ÷ 12000

Example Calculation

Let’s say:

• Room Size: 150 sq ft
• 3 people
• 2 windows

➡️ Required BTU = (150 × 25) + (3 × 600) + (2 × 1000)
➡️ Required BTU = 3750 + 1800 + 2000 = 7550 BTU
➡️ Tonnage = 7550 ÷ 12000 = 0.63 ton

A 1-ton AC would be ideal here.

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Smart Way: Use an Online AC Tonnage Calculator

If you don’t want to do manual math, use an AC Tonnage Calculator Tool (you can embed or build it on your site).
Enter:

• Room dimensions (Length × Width × Height)
• No. of people
• Sunlight exposure
• Region (Hot / Moderate / Cold)

It instantly shows:

• Recommended AC size (tonnage)
• Estimated cooling load (BTU/hr)
• Monthly electricity cost

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Factors That Affect AC Tonnage

1. Room Size

The bigger the room, the more air volume to cool — hence higher tonnage needed.

2. Ceiling Height

High ceilings increase air volume and cooling load.

3. Number of People

Every person emits body heat. For every extra person beyond two, add ~0.1 ton.

4. Windows & Sunlight

Rooms with west-facing windows or glass walls absorb more heat — requiring +0.2 ton adjustment.

5. Regional Climate

Hot regions like Delhi, Rajasthan, or Dubai may need an extra 0.3 ton than the standard.

6. Floor & Insulation

Top-floor apartments or poorly insulated roofs demand more cooling power.

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AC Tonnage vs Room Size Chart (Indian Conditions)

Room Size (sq ft)	AC Tonnage (Hot Region)	AC Tonnage (Moderate)	Electricity per Hour (1 unit = ₹8)
100 sq ft	0.8 Ton	0.75 Ton	0.8 unit (~₹6.4/hr)
150 sq ft	1.2 Ton	1 Ton	1.2 unit (~₹9.6/hr)
200 sq ft	1.5 Ton	1.3 Ton	1.5 unit (~₹12/hr)
250 sq ft	2 Ton	1.8 Ton	1.8 unit (~₹14.4/hr)
300+ sq ft	2.5–3 Ton	2–2.5 Ton	2.5 unit (~₹20/hr)

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How to Calculate AC Power Consumption

Use this formula to estimate your electricity bill:

Power (kW) = Tonnage × 1.2
Energy Consumption (kWh) = Power × Hours per Day × Days per Month

Example:

1.5 Ton AC → Power = 1.5 × 1.2 = 1.8 kW
If used for 8 hours/day for 30 days:
Energy = 1.8 × 8 × 30 = 432 kWh
If cost = ₹8/unit → ₹3,456/month.

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Inverter vs Non-Inverter AC: Which is Better?

Feature	Inverter AC	Non-Inverter AC
Power Saving	30–50% less power	Higher consumption
Cooling	Variable (smart adjust)	Fixed speed
Noise	Very quiet	Louder
Lifespan	Longer	Moderate
Ideal for	Regular users	Occasional use

✅ Verdict: Go for an Inverter Split AC if you use it daily — more efficient and comfortable.

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Tips to Reduce AC Running Cost

1. Right tonnage = right savings.
   Don’t oversize or undersize your AC.

2. Use inverter models.
   They auto-adjust and consume 30% less power.

3. Service regularly.
   Clean filters and coils — improves cooling by 20%.

4. Insulate windows & doors.
   Block sunlight using curtains or film.

5. Use ceiling fan together.
   Helps air circulate, reducing AC load.

6. Set temperature at 24°C.
   Each 1°C higher saves ~6% energy.

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Best AC Capacity for Common Room Types

Room Type	Average Size	Ideal AC Tonnage
Bedroom	120 sq ft	1 Ton
Living Room	200 sq ft	1.5 Ton
Office Cabin	150 sq ft	1 Ton
Small Shop	250 sq ft	2 Ton
Hall / Restaurant	400+ sq ft	2.5–3 Ton

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Understanding BTU, EER & ISEER Ratings

• BTU: Measures cooling capacity. Higher = faster cooling.
• EER (Energy Efficiency Ratio): Cooling (BTU/hr) ÷ Power (Watt). Higher = better efficiency.
• ISEER (India Seasonal Efficiency Ratio): Indian version of EER; used on star labels by BEE.

✅ Always choose 4-star or 5-star models to save long-term electricity.

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Regional Example – Delhi vs Mumbai

Factor	Delhi (Hot & Dry)	Mumbai (Humid & Moderate)
Recommended Tonnage	+0.2 higher	Standard
Ideal Temp	26°C	24°C
Power Usage	Slightly higher	Average
Type	Inverter Split	Split AC

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AC Tonnage Myths Busted

1. ❌ “Higher ton = faster cooling” – Not always! It depends on room insulation.

2. ❌ “Window ACs consume more power” – Modern inverter window ACs are efficient too.

3. ✅ “Bigger is not better” – Oversized ACs waste energy and money.

4. ✅ “Star rating affects your bill” – Always true for long-term use.

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Why You Should Use an AC Tonnage & Cost Calculator

Instead of guessing, an online calculator gives:

• Instant accuracy
• Energy cost transparency
• Better purchase decisions
• Higher comfort and efficiency

It also helps bloggers and businesses attract organic traffic, as users often search for:

“How many tons of AC for my room?”
“1.5 ton AC power consumption per hour”
“AC tonnage calculator online India”

Perfect for SEO targeting!

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• AC tonnage calculator India
• AC size calculator for room
• How many tons AC do I need
• Split AC size chart
• Air conditioner capacity calculator
• 1 ton vs 1.5 ton AC power usage
• AC power consumption calculator
• Best AC for 200 sq ft room

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Conclusion

Choosing the right AC tonnage is a smart move — it ensures maximum cooling, longer AC life, and reduced electricity bills.
Before buying, measure your room size, consider sunlight, people, and insulation.
Use the AC Tonnage Calculator to find the ideal size instantly and estimate your monthly running cost.

With the right tonnage and energy-efficient inverter AC, you’ll stay cool, comfortable, and cost-smart — all year long. ☀️❄️

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FAQ Section

1. How do I calculate AC tonnage for my room?

Use: Room area × 25 BTU + (people × 600) + (windows × 1000). Divide total by 12,000 for tons.

2. What size AC is best for a 150 sq ft room?

A 1 to 1.2 ton AC is ideal for a 150 sq ft room in India.

3. How much electricity does a 1.5 ton AC use per hour?

A 1.5 ton AC consumes around 1.5 units/hour on average.

4. Is inverter AC better for small rooms?

Yes, inverter ACs save energy and provide stable cooling, even for small spaces.

5. Can I use a 1 ton AC for a 200 sq ft room?

Not recommended — it will run continuously and raise power costs. Go for 1.5 ton instead.

🌡️ What Does AC Tonnage Mean?

When we say “1 ton AC”, we’re not referring to its weight — we’re talking about cooling power.

• 1 ton = 12,000 BTUs/hour
• BTU (British Thermal Unit) measures how much heat the AC can remove per hour.
• More BTUs = more cooling capacity.

So, a 1.5-ton AC can remove 18,000 BTUs/hour of heat — suitable for medium rooms of about 150–200 sq ft.

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🧮 How to Calculate Your Required AC Tonnage

Basic Formula

AC Tonnage = (Room Area × 25) + (No. of People × 600) + (No. of Windows × 1000) ÷ 12000

Example

Room: 180 sq ft
People: 3
Windows: 2
➡ BTU = (180×25) + (3×600) + (2×1000) = 4500 + 1800 + 2000 = 8300
➡ Tonnage = 8300 ÷ 12000 = 0.69 ton → choose 1 ton AC

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🧠 How the AC Tonnage Calculator Works

An AC tonnage calculator uses a combination of:

• Room area (L×W×H)
• Sun exposure (north/south-facing)
• Region temperature (hot/moderate)
• Occupancy & electronics load

Then it applies a cooling load algorithm that simulates BTU/hr and converts it into tonnage.
Some calculators even estimate monthly electricity costs, based on power rate (₹/kWh) and hours used.

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📊 Quick Reference Table: Room Size vs AC Tonnage

Room Size (sq ft)	Ceiling Height	People	Ideal AC Tonnage	Type
Up to 100 sq ft	9 ft	1–2	0.8 – 1 ton	Window / Split
100–150 sq ft	9–10 ft	2–3	1 – 1.2 ton	Split AC
150–200 sq ft	10–11 ft	3–4	1.5 ton	Split / Inverter
200–250 sq ft	11 ft+	4–5	2 ton	Inverter Split
300+ sq ft	—	5+	2.5 – 3 ton	Multi / VRF

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⚙️ Factors That Affect AC Sizing

1️⃣ Room Orientation

Rooms facing west or south absorb more sunlight → need +0.2 ton.

2️⃣ Number of Occupants

Each person adds ~600 BTU heat load.

3️⃣ Electronic Devices

TVs, PCs, lights add up to 500–800 BTU/hour.

4️⃣ Ceiling Height

Every extra foot adds ~10% cooling requirement.

5️⃣ Building Location

Hot regions (Delhi, Rajasthan, UAE) → add 0.2–0.3 ton.
Cooler regions (Shimla, Bengaluru) → standard tonnage is fine.

6️⃣ Insulation Quality

Insulated walls/roofs reduce AC load by 15–20%.

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🏠 Room Type & Recommended AC Capacity

Room Type	Average Size	Suggested Tonnage	Ideal Type
Bedroom	100–150 sq ft	1 Ton	Split / Inverter
Living Room	180–250 sq ft	1.5–2 Ton	Split / Inverter
Office Cabin	120–160 sq ft	1 Ton	Split
Small Shop	200–250 sq ft	2 Ton	Commercial Split
Hall / Restaurant	400+ sq ft	3–4 Ton	Cassette / VRF

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⚡ How to Calculate AC Running Cost (Electricity Bill)

Formula:

Running Cost = Power (kW) × Hours × Days × Electricity Rate

Example:

• 1.5 Ton AC → Power = 1.5 × 1.2 = 1.8 kW

• 8 hrs/day × 30 days × ₹8/unit
  = 1.8 × 8 × 30 × 8 = ₹3,456/month

💡 Pro Tip:
Choose Inverter 5-star ACs to save up to 40–50% energy vs 3-star models.

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🔌 Inverter vs Non-Inverter AC Comparison

Feature	Inverter AC	Non-Inverter AC
Compressor Speed	Variable	Fixed
Power Saving	30–50%	Low
Cooling	Smooth & continuous	On/Off cycle
Noise	Quiet	Noisy
Cost	Slightly higher	Lower
Maintenance	Low	Moderate

✅ Verdict: Inverter ACs are better for daily use, long-term savings, and stable cooling.

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🌍 Regional Climate Example – India Specific

City	Climate Type	Recommended Tonnage (150 sq ft)	Notes
Delhi	Hot & Dry	1.2 Ton	Add extra tonnage
Mumbai	Humid	1 Ton	Dehumidify feature helpful
Chennai	Hot & Humid	1.2 Ton	Use inverter for humidity control
Bangalore	Moderate	1 Ton	Normal AC works fine
Jaipur	Dry Heat	1.5 Ton	Add curtains/insulation

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💡 BTU, EER, and ISEER Explained

• BTU (British Thermal Unit): Measures cooling power.
• EER (Energy Efficiency Ratio): BTU/hr ÷ Wattage (higher = better).
• ISEER: India’s BEE standard that includes seasonal changes.

Star Rating	ISEER Range	Efficiency
3-Star	3.1–3.3	Basic
4-Star	3.4–3.5	Good
5-Star	3.6+	Excellent

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🧊 Types of Air Conditioners & Their Ideal Use

Type	Description	Best For
Window AC	Compact single unit	Small rooms
Split AC	Separate indoor/outdoor	Medium rooms
Inverter Split	Variable speed	Energy savings
Portable AC	Movable, plug-in	Rental homes
Cassette AC	Ceiling mount	Large halls, shops
VRF / Ducted AC	Central system	Commercial buildings

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💰 AC Cost & Power Comparison (India)

AC Type	Avg Price (₹)	Power Usage/hr	Ideal Room Size
1 Ton Window	₹25,000–₹35,000	0.8–1 unit	100 sq ft
1.5 Ton Split	₹35,000–₹50,000	1.2–1.5 units	150–200 sq ft
2 Ton Inverter	₹50,000–₹65,000	1.8 units	200–250 sq ft
Portable AC	₹30,000–₹40,000	1.2 units	100–150 sq ft

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🌿 Energy Saving Tips (Maximize Efficiency)

1. Set temperature at 24–26°C.
2. Use ceiling fan + AC for faster cooling.
3. Close windows/doors tightly.
4. Avoid heat-generating appliances near AC.
5. Schedule regular filter cleaning.
6. Install voltage stabilizer for protection.

1. Check for star label before buying.

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🔍 Real-Life Example – Comparing AC Usage

Case 1: 1.5 Ton 3-Star AC

• Usage: 8 hrs/day
• Bill: ₹3,456/month

Case 2: 1.5 Ton 5-Star Inverter

• Usage: 8 hrs/day
• Bill: ₹2,150/month

👉 Monthly savings = ₹1,300
👉 Annual savings = ₹15,600

In 2 years, the higher upfront cost pays back itself!

Use these inside your blog headings/subheadings:

• best ac tonnage calculator india
• 1.5 ton ac power consumption per hour
• ac running cost calculator online
• air conditioner size for bedroom
• 1 ton vs 1.5 ton ac comparison
• best ac for 200 sq ft room
• split ac vs inverter ac cost difference
• ac tonnage calculator for office

• air conditioner electricity consumption calculator

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🧩 Common Mistakes People Make While Choosing AC

1. Ignoring room height: High ceilings = more air volume.
2. Buying oversize ACs: Waste energy and reduce comfort.
3. Placing AC near heat sources: Affects sensors.
4. Not checking airflow direction: Impacts coverage.
5. Skipping service: Lowers efficiency by 20%.

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🧭 When to Upgrade Your Old AC

If your AC is:

• More than 8–10 years old
• Consumes high electricity
• Produces noise or weak airflow

• Has R22 refrigerant (phasing out)

➡ Upgrade to Inverter Split AC (R32 gas) for higher cooling & 40% less power.

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🧾 Quick Checklist Before Buying an AC

✅ Measure room size
✅ Identify direction & sunlight exposure
✅ Choose proper tonnage (use calculator)
✅ Check BEE star rating
✅ Compare inverter vs non-inverter
✅ Read energy label (ISEER)
✅ Estimate running cost

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💬 Extra FAQs (SEO-Rich for Long-Tail Keywords)

6. How much electricity does a 1-ton inverter AC consume in 8 hours?

Roughly 0.8 to 1 unit/hour, depending on brand and ambient temperature.

7. Which AC brand has best power efficiency in India?

Brands like Daikin, LG, Blue Star, Hitachi, and Panasonic are highly efficient.

8. Can I use one AC for two rooms?

Not recommended — uneven cooling and overworking compressor reduce lifespan.

9. How to calculate AC units in electricity bill?

Multiply the AC wattage (kW) by hours used × days/month = units consumed.

10. What is the difference between cooling capacity and tonnage?

Tonnage is a unit (in tons), cooling capacity is the actual heat removed per hour (in BTU/hr).