Convert Imperial Teaspoon to US Gallon
Convert imperial teaspoons to us gallons instantly. 1 imperial teaspoon = 0.0015637369 us gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Gallon to Imperial Teaspoon converter for the reverse conversion.
Units explained
Imperial Teaspoon
An imperial teaspoon is about 5.9194 mL, one third of an imperial tablespoon.
A British cooking measure.
Older UK recipes.
UK cooking measure.
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Imperial Teaspoon to US Gallon conversion formula
The relationship between imperial teaspoons and us gallons:
To convert imperial teaspoons to us gallons, multiply the value in imperial teaspoons by 0.0015637369. To reverse, multiply us gallons by 639.4937737951.
How to use this converter
Type a value into the calculator. The result in us gallons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Gallon to Imperial Teaspoon converter for the reverse direction.
Step-by-step: convert imperial teaspoons to us gallons
- Write down the value in imperial teaspoons (tsp).
- Multiply that value by the factor 0.0015637369.
- The product is the equivalent value in us gallons (gal).
- To reverse, multiply the us gallon value by 639.4937737951.
Worked examples
Example 1 — Convert 1 tsp to gal:
1 × 0.0015637369 = 0.0015637369 gal
Example 2 — Convert 100 tsp to gal:
100 × 0.0015637369 = 0.1563736882 gal
Real-world example — Packaging gauge
A 4-imperial teaspoon plastic bag thickness is a common spec for grocery and freezer bags. Converting from imperial teaspoons to us gallons is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 tsp × 0.0015637369 = 0.0062549475 gal
Real-world example — Plastic film and laminate thickness
A 500-imperial teaspoon sheet is a typical spec for ID-card laminates and film overlays. Converting to us gallons aligns the value with the unit most CAD systems and material datasheets prefer.
500 tsp × 0.0015637369 = 0.7818684411 gal
Imperial Teaspoon to US Gallon conversion table
Standard reference values for converting imperial teaspoons to us gallons:
| Imperial Teaspoon [tsp] | US Gallon [gal] |
|---|---|
| 0.01 | 1.563737e-5 |
| 0.1 | 0.0001563737 |
| 1 | 0.0015637369 |
| 2 | 0.0031274738 |
| 3 | 0.0046912106 |
| 4 | 0.0062549475 |
| 5 | 0.0078186844 |
| 10 | 0.0156373688 |
| 20 | 0.0312747376 |
| 30 | 0.0469121065 |
| 40 | 0.0625494753 |
| 50 | 0.0781868441 |
| 100 | 0.1563736882 |
| 500 | 0.7818684411 |
| 1000 | 1.5637368822 |
Frequently asked questions
How many us gallons is 1 imperial teaspoon?
How do I convert imperial teaspoons to us gallons?
How do I convert us gallons back to imperial teaspoons?
How many us gallons is 100 imperial teaspoons?
Popular volume unit conversions
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Metric / SI (3 units)
US Customary (Liquid) (1 units)
Imperial (UK) (1 units)
Cubic (length-derived) (1 units)
Sources & references
Conversion factor (1 tsp = 0.0015637369 gal) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.