ft_lbからbtuへの変換 (ft·lbf → BTU)

1 ft·lbf = 0.001285BTU. 測定カテゴリ間をスムーズに切り替え、リアルタイムで全単位マトリックスを計算し、瞬時に結果をコピーできます。

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エネルギー・仕事量 Converter

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Formula: --

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Step-by-Step Mathematical Derivation

Verified SI Standard

➡️ Convert ft_lb to btu

Value in BTU = Value in ft·lbf × 0.001285067

To convert any quantity from ft_lb to btu, multiply the quantity by the constant conversion factor 0.001285067.

⬅️ Convert btu to ft_lb (Inverse)

Value in ft·lbf = Value in BTU × 778.1693

To reverse the operation, multiply your btu figure by 778.1693 (or divide by 0.001285067).

🔢 Step-by-Step Calculation Procedure:

Identify the starting value in ft_lb (ft·lbf).
Apply the exact linear conversion factor: 1 ft·lbf = 0.001285067 BTU.
Multiply the input value by 0.001285067 to obtain the exact measurement in btu (BTU).
Verify precision against standard BIPM / NIST SP 811 statutory guidelines.

⚡

All-Units Instant Matrix

Live Computed

j --

kj --

cal --

cal

kcal --

kcal

kwh --

kWh

btu --

BTU

ev --

ft_lb --

ft·lbf

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Printable Reference Cheat Sheet

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Energy & Work Reference Sheet

Standard SI Base Unit: 1 j

aiunitconverters.com

10/14/2026

Unit Name	Symbol	System	Equivalent in j
Joule	J	Standard	1 J = 1 j
Kilojoule	kJ	Standard	1 kJ = 1000 j
Gram Calorie	cal	Standard	1 cal = 4.184 j
Kilocalorie (Food Cal)	kcal	Standard	1 kcal = 4184 j
Kilowatt-hour	kWh	Standard	1 kWh = 3.6000e+6 j
British Thermal Unit	BTU	Standard	1 BTU = 1055.05585 j
Electronvolt	eV	Standard	1 eV = 1.6022e-19 j
Foot-pound	ft·lbf	Standard	1 ft·lbf = 1.3558179483314 j

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Academic & Research Citation Exporter

Cite this mathematical formula and conversion factor in research papers and wikis

BibTeX / APA / IEEE

@misc{ai_unit_converter_ft_lb_to_btu,
  author       = {AI Unit Converters Standards Board},
  title        = {Exact ft_lb to btu Conversion Factor and Mathematical Derivation},
  year         = {2026},
  howpublished = {\url{https://aiunitconverters.com/ja/energy/ft_lb-to-btu}},
  note         = {Derived from NIST Special Publication 811 and BIPM SI Brochure}
}

AI Unit Converters. (2026). ft_lb to btu conversion formula & metric standard. Retrieved from https://aiunitconverters.com/ja/energy/ft_lb-to-btu

[1] AI Unit Converters Standards Board, "ft_lb to btu conversion factor," 2026. [Online]. Available: https://aiunitconverters.com/ja/energy/ft_lb-to-btu. [Accessed: Oct 14, 2026].

\[ 1\text{ ft_lb} = \text{factor} \times 1\text{ btu} \]

📊基準換算表

ft_lb (ft·lbf)btu (BTU)

1ft·lbf	0.0013BTU
2ft·lbf	0.0026BTU
5ft·lbf	0.0064BTU
10ft·lbf	0.0129BTU
15ft·lbf	0.0193BTU
20ft·lbf	0.0257BTU
25ft·lbf	0.0321BTU
50ft·lbf	0.0643BTU
75ft·lbf	0.0964BTU
100ft·lbf	0.1285BTU
250ft·lbf	0.3213BTU
500ft·lbf	0.6425BTU
1000ft·lbf	1.2851BTU
5000ft·lbf	6.4253BTU
10000ft·lbf	12.8507BTU

btu (BTU)ft_lb (ft·lbf)

1BTU	778.1693ft·lbf
2BTU	1,556.3385ft·lbf
5BTU	3,890.8463ft·lbf
10BTU	7,781.6926ft·lbf
15BTU	11,672.5389ft·lbf
20BTU	15,563.3852ft·lbf
25BTU	19,454.2315ft·lbf
50BTU	38,908.463ft·lbf
75BTU	58,362.6945ft·lbf
100BTU	77,816.926ft·lbf
250BTU	194,542.3151ft·lbf
500BTU	389,084.6302ft·lbf
1000BTU	778,169.2603ft·lbf
5000BTU	3,890,846.3017ft·lbf
10000BTU	7,781,692.6033ft·lbf