Kilocalories per Hour to Watts

Reading an Air Conditioner Rated in Frigorías

Walk into an appliance shop in Madrid, Milan, Seoul or Osaka and the cooling capacity on the label may not be a watt figure at all. It is a number of kilocalories per hour — in Spanish-speaking markets written as frigorías. A wall unit is "3 000 frigorías", a cassette is "6 000". Before that can be lined up against a European kW spec or an American BTU/h box, the kcal/h number has to become watts.

Conversion factor: 1 kcal/h = 1.163 W, so multiply the kcal/h figure by 1.163. A unit advertised at 3 000 kcal/h is 3 489 W of cooling — 3.489 kW, or about 11 900 BTU/h, which is the familiar 12 000 BTU class.

Where Cooling Is Still Counted in Kilocalories

The frigoría itself

A frigoría is the heat removed when a kilogram of water is cooled by one degree — a kilocalorie counted the other way round. As a rate, one frigoría per hour and one kcal/h are the same 1.163 W.

Iberian and Italian retail listings

Shop pages, installer quotes and second-hand adverts headline the frigorías number even when the manufacturer's own datasheet inside the box gives kW.

Korean and Japanese capacity plates

Older packaged and ducted equipment from East Asian makers carries kcal/h on the rating plate, a habit inherited from decades of catalogues written in calorie units.

Legacy fan coil schedules

Old building drawings tabulate coil duties in kcal/h. Replacing one fan coil means matching that duty in the watts a modern selection program expects.

Comparing a Frigorías Listing With a Modern Spec Sheet

The point of the conversion is nearly always a like-for-like comparison: the advert says frigorías, the brochure beside it says kW or BTU/h.

Enter the frigorías number from the listing

Type 2 250, 3 000 or 4 500 into the kcal/h field — spaces are ignored and a comma works as a decimal point, so a figure copied from a Spanish or Italian page pastes in cleanly. Watts appear as you type.

Switch the output to whatever the rival brochure uses

The searchable dropdown on the result side carries kW, BTU/h and tons of refrigeration. Pick BTU/h to land on the 9 000 / 12 000 / 18 000 ladder you already recognise, or TR for a commercial schedule.

Reverse it when the installer quotes watts

Press the swap button (↔) to run W → kcal/h and see what frigorías figure a 5.2 kW unit corresponds to, so you can search local adverts with a number sellers actually print.

Lift the bare number onto the frigorías comparison

The copy button hands over the figure with no unit attached — ready for the spreadsheet column where three candidate split units are being ranked side by side.

Capacity is not consumption: 3 000 kcal/h is heat moved out of the room, not electricity bought. A unit of that size with an EER around 3.5 draws roughly 1 kW at the socket, because it pumps heat rather than manufacturing cold.

Air Conditioner Capacities in kcal/h, Watts and BTU/h

The capacity steps that dominate residential and light commercial listings, with the watt value behind each one and the BTU/h class it lands in.

Advertised capacity	Cooling (W)	Cooling (BTU/h)	Typical application
1 500 kcal/h	1 744.5 W	≈5 950	Small bedroom, portable monobloc
2 000 kcal/h	2 326 W	≈7 940	Bedroom or small study
2 250 kcal/h	2 616.75 W	≈8 930	The classic 9 000 BTU wall split
3 000 kcal/h	3 489 W	≈11 900	Living room, 12 000 BTU class
3 500 kcal/h	4 070.5 W	≈13 890	Open-plan lounge or office
4 500 kcal/h	5 233.5 W	≈17 860	Large lounge, 18 000 BTU class
5 500 kcal/h	6 396.5 W	≈21 830	Shop floor or meeting room
6 000 kcal/h	6 978 W	≈23 810	Cassette or ducted unit, 24 000 BTU class

Notice how tidily the frigorías ladder maps onto the BTU ladder: 2 250 lands within one per cent of 9 000 BTU/h, 3 000 within one per cent of 12 000, and 4 500 within one per cent of 18 000. That is no coincidence — the same physical machines are being described in two housekeeping units, which is why a seller can call one box "2 250 frigorías" and the next one "9 000 BTU" with neither label being wrong.

Handy While You Are Shortlisting Units

Every capacity step converts as you type it

Work down a listing page entering 2 000, 2 250 and 3 000 one after another; the watt figure recomputes on each keystroke, with nothing to clear and no button to press.

BTU/h and tons on the same dropdown

Both unit selectors are searchable and cover the whole power family, so one frigorías figure can be read as watts, kilowatts, BTU/h or TR without leaving the page.

Flip round when the quote arrives in kilowatts

Installers write kW, adverts write frigorías. One press of ↔ turns the converter over so you can hunt the local market with the number the sellers use.

Bare figures for the frigorías shortlist

Copy lifts the watt value without its unit or thousands spacing, so the cell where you are ranking candidate units stays numeric and sortable.

Frigorías and Cooling Capacity Questions

Is a frigoría the same thing as a kilocalorie per hour?

A frigoría is a kilocalorie of heat removed rather than added, so as a rate it is numerically identical: 1 frigoría/h = 1 kcal/h = 1.163 W. Advertisers usually drop the "per hour" and simply say "3 000 frigorías", which strictly names an amount of heat but is always meant as a capacity. Treat the number as kcal/h and the arithmetic comes out right.

Why do Spanish and Korean sellers still quote cooling in kcal/h?

Refrigeration engineering ran on calorie units for most of the twentieth century, and in markets that never switched to BTU the habit simply stayed. Buyers learned to shop by frigorías, so shops kept printing them long after regulation put kW on the energy label. The result is an advert with frigorías in the headline and kilowatts in the small print.

Does 3 000 kcal/h tell me how much electricity the unit uses?

No — it is the heat shifted out of the room, several times larger than the power drawn. Divide the cooling figure by the unit's EER or SEER to estimate electrical input: 3 489 W of cooling at an EER of 3.5 is close to 1 000 W on the meter. A machine with a better efficiency rating delivers the same 3 000 kcal/h for less.

How do I recognise a frigorías figure as a familiar BTU size?

Multiply the kcal/h number by about 3.968. That maps 2 250 to roughly 8 930 BTU/h, 3 000 to about 11 900 and 4 500 to about 17 860 — each a hair under the round marketing size. The quick mental version is to multiply by four and knock off a per cent.

Some datasheets write cooling as a negative kcal/h — why?

Because in a heat-balance table every flow needs a sign: heat leaving the space is negative, heat entering it is positive. A reversible heat pump may therefore be listed as −3 000 kcal/h in cooling and +3 400 kcal/h in heating. Enter the size of the number here and read the sign as the direction of the transfer.