BTU Calculator (AC & Heating)
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Ngenai kalkulator iki
A BTU (British Thermal Unit) is a unit of heat, and air conditioners and heaters are rated by how many BTU per hour they can move. This calculator estimates the capacity a room actually needs so you neither undersize the unit (which then runs flat out and never keeps up) nor oversize it (which short-cycles, wastes energy and leaves the room clammy). For cooling it starts from the U.S. EPA rule of thumb of about 20 BTU/h per square foot, then adjusts for ceiling height, sun exposure, occupancy and heat-producing rooms. For heating it scales the floor area by a BTU-per-square-foot factor that rises with a colder climate.
The cooling adjustments are: scale by ceiling height relative to the standard 8 ft; subtract about 10% for a heavily shaded room or add 10% for a very sunny one; add roughly 600 BTU for each occupant beyond the first two; and add about 4,000 BTU for a kitchen, where appliances throw off heat. As a worked example, a 300 sq ft moderate-climate living room with standard ceilings, average sun and two people needs about 300 × 20 = 6,000 BTU/h — a typical window-unit size. Heating that same room in a cold climate uses a factor near 60 BTU/sq ft, or roughly 18,000 BTU/h.
The result is also converted to tons and kilowatts and rounded up to a sensible unit size, using 1 ton of cooling = 12,000 BTU/h and 1 kW ≈ 3,412 BTU/h. So a 6,000 BTU need is about half a ton or 1.76 kW. These are planning estimates: a proper HVAC load calculation (Manual J) also weighs insulation, window quality, air leakage and local climate data, so treat the number as a well-informed starting point for shopping.
Takon-takon kang kerep diajukake
How many BTU do I need per square foot?
Pikeun cooling, ngeunaan 20 BTU per jam per kaki persegi nyaéta titik awal standar, jadi kamar 300 sq ft butuh kira-kira 6,000 BTU. pemanasan butuh leuwih - ti kira-kira 25 BTU / ft persegi dina iklim panas nepi ka 60 dina salah hijina tiis.
Apa sing dadi sebabé, lan apa sing dadi akibaté?
A kamar pisan panonpoé nambahkeun ngeunaan 10% sarta hiji shaded hiji ngaleungitkeun 10%. Satiap panumpang di luar dua nambahkeun sabudeureun 600 BTU, sarta dapur nambahkeun ngeunaan 4,000 BTU sabab alat-alat ngaleupaskeun panas.
Bagaimana cara BTU untuk mengubah ton atau kilowatt?
Saben kilowatt jam (kWh) diitung minangka 1000 watt jam, sarta 1 kilowatt jam diitung minangka 1000 watt jam, sarta 1 kilowatt jam diitung minangka 1000 watt jam.
Apa dhuwure langit-langit bakal ngganti BTU sing dakbutuhake?
Ya. Perkiraan diukur ngalawan langit-langit standar 8 kaki, jadi langit-langit 10 kaki naekeun peryogianana ku kira-kira 25% sabab aya volume udara anu langkung pikeun dikondisinasi. Tetep luhur langit-langit dina pilihan canggih pikeun ngahitungkeunana.
Apa iku ala kanggo tuku AC unit oversized?
Ya. Unit anu gedé teuing ngaleupaskeun hawa gancang tapi dihurungkeun deui saméméh ngaleupaskeun kalembaban anu cukup, ngaleupaskeun kamar anu tiis sareng lembab sareng ngaleungitkeun énergi ku short-cycle. Éta sababna alat ieu ngaleupaskeun ukuran pikeun beban tibatan ngan milih unit anu panggedéna.
Apa pemanasan butuh BTU luwih saka pendinginan kanggo kamar sing padha?
Umumna, sarta éta gumantung pisan kana iklim. Cooling dimimitian di sabudeureun 20 BTU / kaki persegi, sedengkeun pemanasan ngaleuwihan ti kira-kira 25 BTU / kaki persegi dina iklim panas ka 60 dina hiji anu tiis — jadi kamar iklim tiis bisa butuh sababaraha kali kapasitas pemanasan.
Apa aku bisa ngetik ukuran ruangan ing meter persegi?
Ya. Ganti unit wewengkon kana méter pasagi sarta kalkulator bakal ngarobah sacara internal (1 m² ≈ 10.76 sq ft) saméméh nerapkeun aturan BTU-per-square-foot, supados anjeun bisa damel dina unit naon waé anu digunakeun dina rencana lantai anjeun.
API — gunakake kalkulator iki saka kode
Ngadongékeun kalkulator ieu minangka titik akhir JSON bébas — teu peryogi kunci. Kirim nilai medan di handapeun minangka parameter pitakonan atawa JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Waca dokumen lengkap API →
Tampilan
GET https://calculator.free/api/v1/btu/curl
curl "https://calculator.free/api/v1/btu/?mode=cooling&units=sqft&area=300&climate=moderate"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/btu/?" + new URLSearchParams({
"mode": "cooling",
"units": "sqft",
"area": "300",
"climate": "moderate"
}));
const data = await r.json();
console.log(data.results);Hasilna nyaéta perkiraan pikeun pituduh umum, henteu saran finansial, médis atanapi pajak.