BTU to kWh converter
One BTU is 0.00029307107 kWh, worked out from the exact International Table definition rather than a rounded rule of thumb. Put a furnace's heating load or a gas reading in BTU on the same scale as the kilowatt-hours on an electricity bill. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Btu
- 1
- Result
- 0.0002930711 kWh
- Converted
- 0.0002930711
- Kwh
- 0.0002930711
- From unit
- BTU
A BTU-to-kWh converter turns an energy reading in International Table British thermal units into the kilowatt-hour value used on utility bills, HVAC datasheets, and engineering energy balances. Approximate mental shortcuts such as three thousand four hundred twelve BTU per kWh are replaced by the full IT constant, so homework checks and lab exports match modern engineering references.
Why BTU and kilowatt-hours meet at this exact factor
The kilowatt-hour is the everyday SI-derived unit of energy on electricity meters: one kilowatt of power sustained for one hour equals exactly three million six hundred thousand joules. The British thermal unit remains common in North American HVAC nameplates, boiler output tables, natural-gas energy tickets, and older process-engineering notes that still quote heat in BTU rather than joules or kilowatt-hours.
The International Table British thermal unit is the SI-linked definition used in modern conversion tables: one BTU equals one thousand fifty-five point zero five five eight five two six two joules. Dividing that joule definition by the exact joule content of one kilowatt-hour yields a single exact multiplication factor, kilowatt-hours equals BTU times one thousand fifty-five point zero five five eight five two six two over three million six hundred thousand. That makes the conversion deterministic arithmetic rather than a lookup table.
Other historical BTU variants exist—the thermochemical BTU is slightly different—but this tool deliberately hard-codes the International Table constant that engineering unit converters and most web “BTU to kWh” searches expect. Teachers can contrast the exact path with the rough three thousand four hundred twelve BTU per kilowatt-hour rule of thumb so students see how truncation of the IT factor accumulates on large annual heating loads.
Practical tips, checks, and related searches
Round-trip sanity checks are easy: convert one BTU and confirm you receive the rounded factor near two point nine three zero seven one times ten to the minus four kilowatt-hours, or convert three thousand four hundred twelve point one four BTU and confirm the result is extremely close to one kilowatt-hour under the same twelve-decimal rounding. If your source quotes MMBTU or therms, scale to plain BTU first—one MMBTU is one million BTU—before calling this tool.
Stay inside the absolute range so the product cannot overflow into a non-finite result the solver must reject. When teaching unit analysis, pair a heating-load example such as a furnace rated in annual BTU with a utility bill in kilowatt-hours so students see energy, not power, moving across unit systems.
This landing targets people searching for BTU to kWh, convert British thermal units to kilowatt hours, or an exact BTU energy calculator; it is not a multi-unit energy hub, not a kWh-to-BTU primary form, not a BTU/h to watts power converter, and not a gas-billing therm tool. Prefer this capability when the input is already energy in International Table BTU and you only need kilowatt-hours; if you must convert among many energy units in one call, use a broader energy unit converter instead.
Always keep power and energy labels separate: a twelve-thousand BTU per hour air conditioner is a power rating, and only the energy consumed over a chosen number of hours belongs in this converter.
What you can do with it
HVAC and heating load energy reports
Convert seasonal or daily heating energy quoted in BTU into kilowatt-hours for utility comparisons, heat-pump COP checks, and SI engineering energy balances with the same IT factor every row.
FAQ
How many kWh are in one BTU?
Exactly 1055.05585262 / 3600000 kilowatt-hours for the International Table BTU used by this tool: kWh = BTU × (1055.05585262 / 3600000).
Is this BTU/h (power) or BTU (energy)?
Energy only. Input is BTU (International Table). If your label is BTU per hour, multiply by operating hours first to obtain energy, then convert.
Is the BTU to kWh converter free?
The browser tool is free and runs locally.
How many BTU make one kilowatt-hour?
About three thousand four hundred twelve BTU make one kilowatt-hour. That shortcut drops the decimals, though, and on a large annual heating load the gap adds up, which is why the converter keeps the exact factor.
Can I compare a gas reading in BTU with my electricity bill?
Yes. Both measure energy, so once the BTU figure is in kWh you can set it next to the kilowatt-hours on your bill. If the gas figure is in MMBTU, multiply by one million first to get plain BTU.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/conv/btu-to-kwh \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"btu":1}'const res = await fetch("https://api.kit.forhosting.com/conv/btu-to-kwh", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"btu": 1
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/conv/btu-to-kwh",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"btu": 1
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/btu-to-kwh", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"btu":1}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"btu":1}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/btu-to-kwh", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"btu": 1
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "conv.btu_to_kwh",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Limits
max_abs | 1000000000000 |
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
Invalid or missing input fails with a clear invalid_input error instead of inventing a number.
How to call the API and what comes back
Absolute values must stay within the published limit of one trillion. Prefer bare numbers when you control the client; string numbers are accepted only when they match a strict finite numeric pattern without unit suffixes or thousand separators. Send a JSON body with one required finite number field named btu. Aliases british_thermal_units, value, energy, btu_value, and BTU are accepted so SDK clients and form posts can use the name that fits the product. On success the response echoes rounded btu, sets kwh, result, and converted to the same rounded kilowatt-hour magnitude, unit to the token kWh, from_unit to BTU and to_unit to kWh, factor and kwh_per_btu to the rounded exact ratio, joules_per_btu to one thousand fifty-five point zero five five eight five two six two, joules_per_kwh to three million six hundred thousand, formula to the string kWh equals BTU times the joule ratio, message to a short English summary, and steps to an ordered array of substitution lines. Failed validation—missing fields, non-finite numbers, bare plus or minus signs, non-numeric strings, values outside absolute limits, or a non-finite converted result—returns invalid_input and is never charged. Pricing is a flat $0.002 per successful request with unit item and zero marginal unit price. Do not send BTU per hour when you need energy: that is a power quantity and must be multiplied by time in hours before conversion.
Practical tips, checks, and related searches
Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when learners deliberately omit btu or pass text.
Integration use cases
Homework and exam unit checks
Students convert textbook BTU readings to kWh and compare hand work against deterministic steps before submitting worksheets or coding kata fixtures.
Process and facilities energy alignment
Plant notes and boiler logs that still quote BTU can be normalized to kWh for SI datasheets, dashboards, and API payloads without fragile hand-typed factor tables.
Technical questions
Which BTU definition do you use?
The International Table BTU linked to SI: 1 BTU_IT = 1055.05585262 J. This is the definition most modern engineering converters use for BTU to kWh.
What happens on invalid input?
Missing fields, non-finite values, non-numeric strings, or values outside the absolute limits return invalid_input and are never charged.