AI Unit Converters
v1.0

Foot-pound to Joule Converter

1 Foot-pound is equal to 1.355818Joules (J). To convert foot-pounds to joules, multiply the value by 1.355818 or use the interactive formula breakdown and reference tables below.

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Step-by-Step Mathematical Derivation

Verified SI Standard
➡️ Convert Foot-pound to Joule
Value in J = Value in ft·lbf × 1.355818

To convert any quantity from Foot-pound to Joule, multiply the quantity by the constant conversion factor 1.355818.

⬅️ Convert Joule to Foot-pound (Inverse)
Value in ft·lbf = Value in J × 0.7375621

To reverse the operation, multiply your Joule figure by 0.7375621 (or divide by 1.355818).

🔢 Step-by-Step Calculation Procedure:
  1. Identify the starting value in Foot-pound (ft·lbf).
  2. Apply the exact linear conversion factor: 1 ft·lbf = 1.355818 J.
  3. Multiply the input value by 1.355818 to obtain the exact measurement in Joule (J).
  4. Verify precision against standard BIPM / NIST SP 811 statutory guidelines.
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All-Units Instant Matrix

Live Computed
Joule --
J
Kilojoule --
kJ
Gram Calorie --
cal
Kilocalorie (Food Cal) --
kcal
Kilowatt-hour --
kWh
British Thermal Unit --
BTU
Electronvolt --
eV
Foot-pound --
ft·lbf
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Printable Reference Cheat Sheet

Generate clean offline reference PDF tables for Energy & Work

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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_foot-pound_to_joule,
  author       = {AI Unit Converters Standards Board},
  title        = {Exact Foot-pound to Joule Conversion Factor and Mathematical Derivation},
  year         = {2026},
  howpublished = {\url{https://aiunitconverters.com/energy/ft_lb-to-j}},
  note         = {Derived from NIST Special Publication 811 and BIPM SI Brochure}
}

📊Foot-pound to Joule Conversion Tables

Foot-pounds (ft·lbf)Joules (J)
1ft·lbf1.3558J
2ft·lbf2.7116J
5ft·lbf6.7791J
10ft·lbf13.5582J
15ft·lbf20.3373J
20ft·lbf27.1164J
25ft·lbf33.8954J
50ft·lbf67.7909J
75ft·lbf101.6863J
100ft·lbf135.5818J
250ft·lbf338.9545J
500ft·lbf677.909J
1000ft·lbf1,355.8179J
5000ft·lbf6,779.0897J
10000ft·lbf13,558.1795J
Joules (J)Foot-pounds (ft·lbf)
1J0.7376ft·lbf
2J1.4751ft·lbf
5J3.6878ft·lbf
10J7.3756ft·lbf
15J11.0634ft·lbf
20J14.7512ft·lbf
25J18.4391ft·lbf
50J36.8781ft·lbf
75J55.3172ft·lbf
100J73.7562ft·lbf
250J184.3905ft·lbf
500J368.7811ft·lbf
1000J737.5621ft·lbf
5000J3,687.8107ft·lbf
10000J7,375.6215ft·lbf
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❓ Frequently Asked Questions: Foot-pound to Joule

How do you convert Foot-pounds to Joules?▼

1 Foot-pound is equal to 1.355818 Joules. Multiply your input value in Foot-pounds by 1.355818 to obtain the exact equivalent in Joules.

How many Joules are in 1 Foot-pound?▼

There are exactly 1.355818Joules (J) in 1 Foot-pound (ft·lbf).

Are these calculations calibrated against official measurement standards?▼

Yes. All conversion factors on AI Unit Converters are calibrated and cross-verified against official BIPM SI Brochure (9th Edition), NIST SP 811, and ISO 80000 measurement metrology standards.

Related energy Converters

Foot-pound to JouleFoot-pound to KilojouleFoot-pound to Gram CalorieFoot-pound to Kilocalorie (Food Cal)Foot-pound to Kilowatt-hourFoot-pound to British Thermal UnitFoot-pound to Electronvolt