Mass per volume density.
Pounds per Cubic foot to Grains per Teaspoon Converter — lb/ft3 to gr/tsp
Convert Pound per Cubic foot (lb/ft3) to Grain per Teaspoon (gr/tsp) using the exact conversion factor (1 pound per cubic foot = 1.218442564 grain per teaspoon). See the formula, worked examples, conversion table, and common uses.
Pounds per Cubic foot to Grains 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 / 13.14667088.
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 Grains per Teaspoon
Pound per Cubic foot and Grain 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
grains per teaspoon = pounds per cubic foot × 1.21844256366
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 grain per teaspoon equals 13.1466708828 base units, so dividing one by the other gives the direct pound per cubic foot-to-grain per teaspoon factor of 1.21844256366.
Simple example
1 lb/ft3 × 1.218442564 = 1.218442564 gr/tsp
1 pound per cubic foot = 1.218442564 grains per teaspoon.
Real-world example
1,000 lb/ft3 × 1.218442564 = 1,218.442564 gr/tsp
1,000 pounds per cubic foot = 1,218.442564 grains per teaspoon.
Conversion table
| Pound per Cubic foot (lb/ft3) | Grain per Teaspoon (gr/tsp) |
|---|---|
| 0.1 lb/ft3 | 0.1218442564 gr/tsp |
| 1 lb/ft3 | 1.218442564 gr/tsp |
| 10 lb/ft3 | 12.18442564 gr/tsp |
| 100 lb/ft3 | 121.8442564 gr/tsp |
| 1,000 lb/ft3 | 1,218.442564 gr/tsp |
| 10,000 lb/ft3 | 12,184.42564 gr/tsp |
Reverse conversion: Grain per Teaspoon to Pound per Cubic foot
1.218442564 gr/tsp × 0.8207198516 = 1 lb/ft3
1.218442564 grains per teaspoon = 1 pounds per cubic foot.
pounds per cubic foot = grains per teaspoon × 0.820719851577
For a page dedicated to this direction, see Grain 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 Grain per Teaspoon (gr/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 grains per teaspoon are in 1 pound per cubic foot?
1 pound per cubic foot equals 1.218442564 grains per teaspoon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to grain per teaspoon?
Multiply the pound per cubic foot value by 1.218442564. The converter above does this instantly to whatever precision you set.
How do I convert grain per teaspoon back to pound per cubic foot?
Use the reverse factor: 1 grain per teaspoon equals 0.8207198516 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 grain per teaspoon?
Grain per Teaspoon (gr/tsp) is a unit of density.
Is the pound per cubic foot to grain per teaspoon conversion exact?
Yes. Both pound per cubic foot and grain per teaspoon are defined by fixed standards rather than physical artifacts, so the factor of 1.218442564 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.