Mass per volume density.
Pounds per Cubic foot to Long tons per Teaspoon Converter — lb/ft3 to long ton/tsp
Convert Pound per Cubic foot (lb/ft3) to Long ton per Teaspoon (long ton/tsp) using the exact conversion factor (1 pound per cubic foot = 7.77068e-8 long ton per teaspoon). See the formula, worked examples, conversion table, and common uses.
Pounds per Cubic foot to Long tons per Teaspoon converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 16.01846337 / 2.06139799e+8.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cubic foot to Long tons per Teaspoon
Pound per Cubic foot and Long ton per Teaspoon both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Pound per Cubic foot is most often used for us construction material density specs (concrete, soil, lumber, insulation).
Formula
long tons per teaspoon = pounds per cubic foot × 7.77068e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic foot equals 16.018463374 base units, and 1 long ton per teaspoon equals 206139799.442 base units, so dividing one by the other gives the direct pound per cubic foot-to-long ton per teaspoon factor of 7.77068e-8.
Simple example
1 lb/ft3 × 7.77068e-8 = 7.77068e-8 long ton/tsp
1 pound per cubic foot = 7.77068e-8 long tons per teaspoon.
Real-world example
1,000 lb/ft3 × 7.77068e-8 = 0.0000777068 long ton/tsp
1,000 pounds per cubic foot = 0.0000777068 long tons per teaspoon.
Conversion table
| Pound per Cubic foot (lb/ft3) | Long ton per Teaspoon (long ton/tsp) |
|---|---|
| 0.1 lb/ft3 | 7.77068e-9 long ton/tsp |
| 1 lb/ft3 | 7.77068e-8 long ton/tsp |
| 10 lb/ft3 | 7.77068e-7 long ton/tsp |
| 100 lb/ft3 | 0.0000077707 long ton/tsp |
| 1,000 lb/ft3 | 0.0000777068 long ton/tsp |
| 10,000 lb/ft3 | 0.000777068 long ton/tsp |
Reverse conversion: Long ton per Teaspoon to Pound per Cubic foot
7.77068e-8 long ton/tsp × 12868887.27 = 1.00000005 lb/ft3
7.77068e-8 long tons per teaspoon = 1.00000005 pounds per cubic foot.
pounds per cubic foot = long tons per teaspoon × 12868887.2727
For a page dedicated to this direction, see Long ton per Teaspoon to Pound per Cubic foot.
Understanding the Pound per Cubic foot
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
Where it's used: United States (construction, engineering, materials specifications)
Uses of the Pound per Cubic foot today
- US construction material density specs (concrete, soil, lumber, insulation)
- US engineering material property tables
- Bulk material handling and shipping weight estimates
Understanding the Long ton per Teaspoon (long ton/tsp)
Mass per volume density.
Pound per Cubic foot — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many long tons per teaspoon are in 1 pound per cubic foot?
1 pound per cubic foot equals 7.77068e-8 long tons per teaspoon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to long ton per teaspoon?
Multiply the pound per cubic foot value by 7.77068e-8. The converter above does this instantly to whatever precision you set.
How do I convert long ton per teaspoon back to pound per cubic foot?
Use the reverse factor: 1 long ton per teaspoon equals 12,868,887.27 pounds per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic foot?
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
What is a long ton per teaspoon?
Long ton per Teaspoon (long ton/tsp) is a unit of density.
Is the pound per cubic foot to long ton per teaspoon conversion exact?
Yes. Both pound per cubic foot and long ton per teaspoon are defined by fixed standards rather than physical artifacts, so the factor of 7.77068e-8 used above is exact to as many digits as you choose to display.
Where is the pound per cubic foot still used today?
United States (construction, engineering, materials specifications)
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.