The Feet to Kg Calculator helps users convert the length of an object in feet into its weight in kilograms, using known linear density. Since feet measure length and kilograms measure mass, the conversion requires one additional piece of information: the mass per unit length (called linear density). This calculator is commonly used in construction, engineering, textile, and material handling applications where materials like cables, pipes, and fabrics have a known weight per foot.
formula of Feet To Kg Calculator
Kilograms = Feet × Linear Density (kg/ft)
Where:
- Feet = length of the object in feet
- Linear Density = mass per unit length, in kg/ft
- Kilograms = total weight or mass of the object
Important Note:
This is not a simple conversion between units like inches to centimeters. Since length and mass are different physical quantities, we must know how heavy each foot of the material is.
Rearranged formulas:
- Feet = Kilograms / Linear Density
- Linear Density = Kilograms / Feet
These versions are useful when any one of the three values is missing and needs to be calculated.
Reference Table: Common Feet-to-Kg Values by Material
| Material Type | Linear Density (kg/ft) | Approx. Weight for 10 ft (kg) |
|---|---|---|
| Steel Pipe (2") | 2.72 | 27.2 |
| Copper Cable (AWG 2/0) | 0.60 | 6.0 |
| Aluminum Rod (1") | 0.74 | 7.4 |
| PVC Pipe (1.5") | 0.45 | 4.5 |
| Nylon Rope (3/4") | 0.18 | 1.8 |
| Cotton Fabric Roll | 0.12 | 1.2 |
This table helps users quickly estimate mass without a calculator when working with standard materials.
Example of Feet To Kg Calculator
Let’s say you are working with a roll of copper cable that has a linear density of 0.6 kg/ft, and you have 50 feet of it.
Step-by-step:
Kilograms = Feet × Linear Density
Kilograms = 50 × 0.6 = 30 kg
So, the total weight of the cable is 30 kilograms.
If you only know the weight (say 15 kg) and want to find how many feet that covers:
Feet = Kilograms / Linear Density
Feet = 15 / 0.6 = 25 ft
This calculator provides both directions of use.
Most Common FAQs
No. You must know the material's linear density. Without it, the calculation cannot be completed because length alone doesn’t determine weight.
You can calculate linear density using:
Linear Density = Kilograms / Feet
This is useful for back-calculating unknown values when two variables are known.
Slightly, yes. For some materials like fabric or wood, moisture can change the weight slightly. For metals and synthetics, the change is usually very small and often ignored in practical applications.