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Foot-pounds to Watt-hours Converter (ft·lb to Wh)

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Live Conversion • ISO 80000-5:2019 Certified
1 Foot-pound = 0.0003766161 Watt-hour
1 ft·lb = 0.000376616 Wh • 1 Wh = 2655.223737 ft·lb
Foot-pound to Watt-hour: One Foot-pound is equal to 0.0003766161 Watt-hours.
Certified Authority Value
0.00037662
Wh
Exact: 1 Wh ≡ 2655.2237373982 ft·lb
ft·lb
ft·lb
Swap to Watt-hour to Foot-pound
Swap to Watt-hour to Foot-pound
Wh
Wh 0.0003766161
Quick Values:
Conversion Formula
To convert Foot-pound to Watt-hour, multiply by 0.0003766161
ft·lb × 0.0003766161 = Wh

Calculation: 1 ft·lb × 0.0003766161 = 0.0003766161 Wh

Common Foot-pound to Watt-hour Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Foot-pound (ft·lb) and Watt-hour (Wh).

Tap any row to calculate
Foot-pound to Watt-hour: Primary Direct Table (15 Steps)
Foot-pound to Watt-hour Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 ft·lb 3.766161 × 10⁻⁷ Wh 3.766 × 10⁻⁷
0.01 ft·lb 3.766161 × 10⁻⁶ Wh 3.766 × 10⁻⁶
0.1 ft·lb 3.766161 × 10⁻⁵ Wh 3.766 × 10⁻⁵
0.5 ft·lb 0.000188308 Wh 1.883 × 10⁻⁴
1 ft·lb 0.000376616 Wh 3.766 × 10⁻⁴
2 ft·lb 0.000753232 Wh 7.532 × 10⁻⁴
5 ft·lb 0.00188308 Wh 1.883 × 10⁻³
10 ft·lb 0.00376616 Wh 3.766 × 10⁻³
20 ft·lb 0.00753232 Wh 7.532 × 10⁻³
25 ft·lb 0.0094154 Wh 9.415 × 10⁻³
50 ft·lb 0.0188308 Wh 1.883 × 10⁻²
100 ft·lb 0.0376616 Wh 3.766 × 10⁻²
250 ft·lb 0.094154 Wh 9.415 × 10⁻²
500 ft·lb 0.188308 Wh 1.883 × 10⁻¹
1000 ft·lb 0.376616 Wh 3.766 × 10⁻¹
Watt-hour to Foot-pound: Reciprocal Summary
Watt-hour to Foot-pound Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Wh 2655.223737 ft·lb 2.655 × 10³
5 Wh 13276.118687 ft·lb 1.328 × 10⁴
10 Wh 26552.237374 ft·lb 2.655 × 10⁴
50 Wh 132761.18687 ft·lb 1.328 × 10⁵
100 Wh 265522.37374 ft·lb 2.655 × 10⁵
View Complete 15-Row Watt-hour to Foot-pound Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Foot-pound (ft·lb) and Watt-hour (Wh):

Foot-pound References:

  • Mechanical energy required to raise a one-pound weight vertically by one foot (1.356 J) 1 ft·lb
  • Kinetic energy of a standard 9mm pistol handgun bullet projectile at muzzle 350 ft·lb

Watt-hour References:

  • Standard modern smartphone lithium-ion battery total energy capacity 15 Wh
  • Rechargeable AA nickel-metal hydride (NiMH) consumer battery capacity 2.5 Wh
  • High-end laptop computer airline-approved battery pack capacity 99 Wh

Tap any benchmark above to automatically calculate its exact equivalent in Watt-hour.

ISQ Dimension: [M L² T⁻²] Coherent SI Unit: joule (J) Chemical Engineering, Solutions & Physical Chemistry

How to Convert Foot-pound to Watt-hour

Converting Foot-pound (ft·lb) to Watt-hour (Wh) is a core calculation in Energy and Work, which quantifies the physical capacity to perform mechanical work, generate heat, or emit electromagnetic radiation. This calculation navigates the boundary between the International Metric System (SI) and British Imperial / US Customary engineering standards. In contemporary metrology, Imperial units are defined in terms of exact SI standards via international agreements—notably NIST SP 811 and the 1959 International Yard and Pound Agreement. Exactly 1 Foot-pound equals 0.000376616 Watt-hour, while 1 Wh equals 2655.223737 ft·lb.

Direct Factor1 ft·lb = 0.000376616 Wh
Inverse Ratio1 Wh = 2655.223737 ft·lb
Conversion ScaleMetric SI to British Imperial / US Customary Bridge
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (joule (J)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 ft·lb = 1.355818 joule (J)
2. Target SI Bridge (ktarget):1 Wh = 3600 joule (J)
Step-by-step substitution for Foot-pound → Watt-hour:V(Wh) = V(ft·lb) × ( 1.355818 / 3600 ) = V(ft·lb) × 0.000376616
Mathematical FormulaValue in Watt-hour = Value in Foot-pound × 0.0003766161Direct computational formula applied for standard conversion.
Worked Example

To convert 120 Foot-pound (ft·lb) to Watt-hour (Wh): multiply 120 by 0.000376616 to get 0.0451939 Wh. At an industrial engineering scale, 100 ft·lb converts to 0.0376616 Wh.

Inverse check: 1 Wh = 2655.223737 ft·lb.

Understanding Foot-pound and Watt-hour

Foot-pound

ft·lb
Imperial / US

A Foot-pound (ft·lb) is an imperial and US customary unit for energy and work.

Applications & Practical Context

In practical energy terms, a mechanical energy required to raise a one-pound weight vertically by one foot (1.356 J) equals 1 ft·lb, a kinetic energy of a standard 9mm pistol handgun bullet projectile at muzzle equals 350 ft·lb.

Physical Setup

An energy quantity of 1 ft·lb corresponds to 1.355818 J (performing 1.355818 joules of work or heat transfer).

Conversion to SI Unit: joule (J)
1 ft·lb = 1.355818 J

Watt-hour

Wh
Standard Unit

A Watt-hour (Wh) is a recognized unit for energy and work.

Applications & Practical Context

In practical energy terms, a standard modern smartphone lithium-ion battery total energy capacity equals 15 Wh, a rechargeable AA nickel-metal hydride (NiMH) consumer battery capacity equals 2.5 Wh, a high-end laptop computer airline-approved battery pack capacity equals 99 Wh.

Physical Setup

An energy quantity of 1 Wh corresponds to 3600 J (performing 3600 joules of work or heat transfer).

Conversion to SI Unit: joule (J)
1 Wh = 3600 J

Domain Metrology & Engineering Applications

Governing Law & Equation

First Law of Thermodynamics (Conservation of Energy: ΔU = Q - W)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using isoperibol bomb calorimeters, optical laser pulse joulemeters, and digital revenue-grade electric energy meters.

Primary Industry Sectors

Applied across electric power utility metering, thermal energy storage design, chemical plant process enthalpies, and ballistic impact engineering under international metrology standard ISO 80000-5:2019, NIST SP 811.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering ReferenceReference ValueConverted to Watt-hour
Mechanical energy required to raise a one-pound weight vertically by one foot (1.356 J)1 ft·lb0.000376616 Wh
Kinetic energy of a standard 9mm pistol handgun bullet projectile at muzzle350 ft·lb0.131816 Wh
Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, NIST SP 811 and the BIPM SI Brochure (9th Edition). Governed by First Law of Thermodynamics (Conservation of Energy: ΔU = Q - W) under ISO 80000 dimensional vector [M L² T⁻²].

Multi-Variable Engineering Bridge Thermal Enthalpy & Continuous Power

Energy to Continuous Operating Power Bridge (Watts • Kilowatts • Megawatts • Horsepower)

Calculate required average generating or consuming power P = E / t over specified timespans, bridging energy [M L² T⁻²] with continuous power [M L² T⁻³].

P = E / t
Vector: [J] ÷ [s] → [W]
Live Calculated Bridge Equivalent:
1 ft·lb at 1 Hour Continuous Run (3,600 s) = 0.0003766 W
Equals 3.7662 × 10⁻⁷ kW • 3.766161 × 10⁻¹⁰ MW • 5.0505 × 10⁻⁷ hp
SI Power
0.0003766
W
Watts
Grid / Utility
3.7662 × 10⁻⁷
kW
Kilowatts
Power Plant
3.766161 × 10⁻¹⁰
MW
Megawatts
Mechanical Rating
5.0505 × 10⁻⁷
hp
Horsepower (Mechanical)
Metric Horsepower
5.1206 × 10⁻⁷
PS
Metric Horsepower (PS)
HVAC Thermal Rating
0.0013
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (J):
    E = 1 ft·lb × 1.35581795 = 1.35581795 J
  2. 2. Apply Engineering Parameter (t):
    Selected condition: 1 Hour Continuous Run (3,600 s) at t = 3600 s
  3. 3. Execute Governing Physical Law in SI Units:
    P = E / t = (1.35581795 J) ÷ (3600 s) = 0.00037662 W
  4. 4. Convert to Standard Engineering Units:
    • W: 0.00037662 × 1 = 0.0003766 W (Watts) • kW: 0.00037662 × 0.001 = 3.7662 × 10⁻⁷ kW (Kilowatts) • MW: 0.00037662 × 1 × 10⁻⁶ = 3.766161 × 10⁻¹⁰ MW (Megawatts) • hp: 0.00037662 × 0.001341 = 5.0505 × 10⁻⁷ hp (Horsepower (Mechanical)) • PS: 0.00037662 × 0.00136 = 5.1206 × 10⁻⁷ PS (Metric Horsepower (PS)) • BTU/h: 0.00037662 × 3.4121 = 0.0013 BTU/h (BTU per Hour)
Explore Full Power Converter →
Engineering Substance / Operating Standard Parameter Value (s) Reference State / Condition Typical Industrial & Engineering Application
1 Second Instant Discharge 1 1.0 s Peak pulse discharge rating
1 Minute Fast Delivery (60 s) 60 60 s EV fast acceleration or battery boost
1 Hour Continuous Run (3,600 s) 3600 3,600 s (1 hour) Standard 1-hour energy delivery
8 Hours (28,800 s) 28800 28,800 s (8 hours) Single shift continuous draw
24 Hours (86,400 s) 86400 86,400 s (24 hours) Full day steady-state consumption
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Frequently Asked Questions

There are exactly 0.0003766161 watt-hours (Wh) in 1 foot-pound (ft·lb). To calculate larger amounts manually, simply multiply your total number of foot-pounds by the conversion multiplier of 0.0003766161.

The mathematical formula to convert foot-pounds to watt-hours is: [value] * 0.0003766161 = watt-hours. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from watt-hours back to foot-pounds, you must divide your starting value by 0.0003766161. Our bidirectional tool automatically computes this inverse equation the moment you type into the watt-hour input field.

1 Watt-hour is larger than 1 Foot-pound. Specifically, 1 Foot-pound equals 0.0003766161 watt-hours, meaning 1 Watt-hour is 2655.2237 times larger than 1 Foot-pound (a difference of 3.42 orders of magnitude). Expressing measurements in foot-pounds requires a larger numerical value to represent the equivalent physical magnitude.

A typical mechanical energy required to raise a one-pound weight vertically by one foot (1.356 J) measures 1 ft·lb, which corresponds to 0.0003766 Wh (Watt-hour).

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