AC Tonnage Calculator
Estimate the right AC size in tons for your room from its area, ceiling height, floor, sunlight, people and appliances.
Result
How to use
- 1
Enter the room's length, width and ceiling height in feet.
- 2
Tell us the floor, sunlight, people and appliances.
- 3
See the cooling load in BTU/hr and the recommended AC size in tons.
Questions
What AC size do I need for my room?
As a rough guide for Indian summers: up to about 120 sq ft — 1 ton, 120–180 sq ft — 1.5 ton, 180–250 sq ft — 2 ton, for a 10 ft ceiling on a middle floor. Top floors, west-facing rooms and more people need more.
What does 1 ton of AC mean?
1 ton of refrigeration removes 12,000 BTU of heat per hour (about 3.52 kW of cooling). It is the cooling power, not the weight or the electricity used.
Is a bigger AC always better?
No. An oversized AC cools quickly but switches off before removing humidity, leaving the room clammy, and costs more. An inverter AC sized correctly gives the best comfort and lowest bills.
About this AC Tonnage tool
AC Tonnage Calculator — Estimate the right AC size in tons for your room from its area, ceiling height, floor, sunlight, people and appliances. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Enter the room's length, width and ceiling height in feet.
Related reading
Articles that go with this tool
One Phone-Free Sunday: What a Day Without Scrolling Taught Me
I switched off my phone for one full Sunday. The first hour was hard, the rest of the day was the calmest I’d had in months. Here’s what happened, and how you can try it too.
Kids and Screens: A Practical Guide to Healthy Screen Time for Indian Families
Phones keep kids quiet — but at what cost? What WHO recommends for young children, warning signs to watch, and simple family rules that actually work.
Simple Living and Decluttering: Owning Less, Living More
Cupboards full of things we never use, and minds full of noise. A gentle, practical guide to decluttering your home and simplifying your life — without becoming extreme.
Related tools
More everyday tools you may like
Results are estimates to help you plan. They are not financial, tax or medical advice.