Foot-Pound to Hartree Converter

Energy Converter

27 units available

Decimals:

From

To

3.109856e+17

1 ft·lbf = 3.109856e+17 Eh

Formula:

Eh = ft·lbf × 3.109856e+17

With your value: 1 ft·lbf = 3.109856e+17 Eh

How big is that?

Everyday references on a logarithmic scale, all expressed in foot-pound so you can sanity-check the result.

Heartbeat (1/1.4 your value)0.738 ft·lbf

Your value1.00 ft·lbf

AA battery charge (7.4e+3× your value)7.38e+3 ft·lbf

Slice of bread (2.1e+5× your value)2.07e+5 ft·lbf

Daily food intake (6.2e+6× your value)6.20e+6 ft·lbf

Litre of petrol (2.5e+7× your value)2.52e+7 ft·lbf

Other Foot-Pound to Hartree conversions

2 ft·lbf to Eh 3 ft·lbf to Eh 4 ft·lbf to Eh 5 ft·lbf to Eh 6 ft·lbf to Eh 7 ft·lbf to Eh 8 ft·lbf to Eh

Foot-Pound to Hartree Conversion Table

Foot-Pound (ft·lbf)	Hartree (Eh)
0.5	1.554928e+17
1	3.109856e+17
2	6.219713e+17
5	1.554928e+18
10	3.109856e+18
15	4.664784e+18
20	6.219713e+18
25	7.774641e+18
50	1.554928e+19
100	3.109856e+19
250	7.774641e+19
500	1.554928e+20
1000	3.109856e+20

Hartree to Foot-Pound Conversion Table

Hartree (Eh)	Foot-Pound (ft·lbf)
0.5	1.607791e-18
1	3.215583e-18
2	6.431165e-18
5	1.607791e-17
10	3.215583e-17
15	4.823374e-17
20	6.431165e-17
25	8.038957e-17
50	1.607791e-16
100	3.215583e-16
250	8.038957e-16
500	1.607791e-15
1000	3.215583e-15

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Foot-Pound (ft·lbf)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Hartree (Eh)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Foot-Pound to Hartree

To convert from Foot-Pound (ft·lbf) to Hartree (Eh), multiply the value by 3.109856e+17.

Formula: Eh = ft·lbf × 3.109856e+17

Reverse: ft·lbf = Eh × 3.215583e-18

Step-by-Step Example

Start with your value in Foot-Pound. For example: 5 ft·lbf
Multiply by the conversion factor: 5 x 3.109856e+17
The result is: 1.554928e+18 Eh

About Foot-Pound

The foot-pound (ft·lbf) is a unit of energy and work. One foot-pound equals 1.355817948 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Hartree

The hartree (Eh) is a unit of energy and work. One hartree equals 4.359745 × 10^-18 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Hartree are in 1 Foot-Pound?

There are exactly 3.109856e+17 Hartree in 1 Foot-Pound. This means the conversion factor from Foot-Pound to Hartree is 3.109856e+17.

What is the formula to convert Foot-Pound to Hartree?

The formula to convert Foot-Pound to Hartree is: Eh = ft·lbf × 3.109856e+17. For example, to convert 10 Foot-Pound to Hartree, you would multiply 10 by 3.109856e+17.

What is a Foot-Pound?