Work from one pound-force over one foot.
Foot-pounds to Decijoules Converter — ft-lb to dJ
Convert Foot-pound (ft-lb) to Decijoule (dJ) using the exact conversion factor (1 foot-pound = 13.55817948 decijoule). See the formula, worked examples, and conversion table.
Foot-pounds to Decijoules converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Decijoule is 0.1 joule units.
Result = input x 1.355817948 / 0.1.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Foot-pounds to Decijoules
Foot-pound and Decijoule both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Work from one pound-force over one foot, and decijoule is 0.1 joule units.
Formula
decijoules = foot-pounds × 13.5581794833
This factor comes from each unit's defined relationship to the category's base unit: 1 foot-pound equals 1.35581794833 base units, and 1 decijoule equals 0.1 base units, so dividing one by the other gives the direct foot-pound-to-decijoule factor of 13.5581794833.
Simple example
1 ft-lb × 13.55817948 = 13.55817948 dJ
1 foot-pound = 13.55817948 decijoules.
Real-world example
100 ft-lb × 13.55817948 = 1,355.817948 dJ
100 foot-pounds = 1,355.817948 decijoules.
Conversion table
| Foot-pound (ft-lb) | Decijoule (dJ) |
|---|---|
| 1 ft-lb | 13.55817948 dJ |
| 10 ft-lb | 135.5817948 dJ |
| 50 ft-lb | 677.9089742 dJ |
| 100 ft-lb | 1,355.817948 dJ |
| 500 ft-lb | 6,779.089742 dJ |
| 1,000 ft-lb | 13,558.17948 dJ |
Reverse conversion: Decijoule to Foot-pound
13.55817948 dJ × 0.07375621493 = 0.9999999998 ft-lb
13.55817948 decijoules = 0.9999999998 foot-pounds.
foot-pounds = decijoules × 0.0737562149277
For a page dedicated to this direction, see Decijoule to Foot-pound.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
Understanding the Decijoule (dJ)
Decijoule is 0.1 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many decijoules are in 1 foot-pound?
1 foot-pound equals 13.55817948 decijoules, using the exact defined conversion factor rather than an estimate.
How do I convert foot-pound to decijoule?
Multiply the foot-pound value by 13.55817948. The converter above does this instantly to whatever precision you set.
How do I convert decijoule back to foot-pound?
Use the reverse factor: 1 decijoule equals 0.0737562149 foot-pounds. You can also use the swap control in the converter above to flip the direction instantly.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of engineering.
What is a decijoule?
Decijoule (dJ) is a unit of engineering.
Is the foot-pound to decijoule conversion exact?
Yes. Both foot-pound and decijoule are defined by fixed standards rather than physical artifacts, so the factor of 13.55817948 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.