# Thread: How to convert tons to BTU

1. Junior Member
Join Date
Mar 2007
Posts
2

## How to convert tons to BTU

According to the information I have, a ton is equal to 12,000 BTUs. Is this correct? To convert a BTU to a watt, do I have to divide it by 3,414? Thank you.

2. 1 watt= 3.412 BTU

3. Here is a quote from another thread

Originally Posted by lowryder88h

If you don't have all the spec's but you know the tonage, I use this rule of thumb for calc's. 1 ton = 12000 BTU

1 watt= 3.412 BTU

ex. 4 tons x 12000 BTU = 48000 BTU

48000 div by 3.412 = 14068 watts

14068 div by 240v = 58.6 amps

Its not a percise science but it will get you into the ball park.

4. 3.412 or 3,412 boy that sure could mess up a calculation.

5. Senior Member
Join Date
Nov 2004
Posts
3,172

## Well, sort of:

Let's be exact:

1 ton of cooling is equivalent to 12,000 BTU/hour

which is equivalent to melting a ton of ice over 24 hours.

It is improper to equate power to energy! You should say,

1 watt-hour (energy) = 3.412 BTU (energy)

You cannot compute current draw this way because the AC pumps heat from one area to another. This is true whether you are heating or cooling with the AC unit. If you know the S.E.E.R. rating of the unit you can compute the power input. You can then compute the current draw if you know the PF of the unit.

Do a search on S.E.E.R. for more.

6. Senior Member
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Jul 2004
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Ca and Wa
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For quick roundoff results....3.5kW= 1 Ton
a 4 Ton x 3.5= 14,000/240= 58 something
This figure of course does not include seasonal EER adjustments either.

7. 4 tons, 58 amps? Something seems a little off. Generally we find that 1 ton will have a load of about 8-10 amps. I guess that this figure represents lower ampacities due to the SEER rating.

8. Senior Member
Join Date
Nov 2004
Posts
3,172

## For the Record:

Originally Posted by infinity
4 tons, 58 amps? Something seems a little off. Generally we find that 1 ton will have a load of about 8-10 amps. I guess that this figure represents lower ampacities due to the SEER rating.
FYI, my 40 year old 3-ton Night/Day unit drew 19A @ 240V. Haven't checked the new one.

Yes, you must consider the SEER number or your results will be grossly high.

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