---
title: "1.5 tsp to gal = 0.0019531 gal"
description: "1.5 teaspoons is 0.0019531 US gallons. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/1-5-teaspoons-to-gallons/
site: "At One Place"
---

# 1.5 tsp to gal

**1.5 teaspoons in US gallons: 1.5 tsp = 0.0019531 gal**

gal = tsp × 0.001302083333

1.5 teaspoons is 0.0019531 US gallons. To get there, multiply by 0.001302083333.

## Values either side

*Teaspoons near 1.5, converted to US gallons.*

| Teaspoons | US gallons |
| --- | --- |
| 0.5 tsp | 0.000651 |
| 1 tsp | 0.0013021 |
| 1.5 tsp ← | 0.0019531 |
| 2 tsp | 0.0026042 |
| 2.5 tsp | 0.0032552 |
| 3 tsp | 0.0039063 |
| 4 tsp | 0.0052083 |

## How the conversion works

The relationship is gal = tsp × 0.001302083333. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

> US gallon: US liquid gallon. The imperial gallon is about 20% larger.

## Common questions

### What is 1.5 tsp in US gallons?

1.5 tsp is 0.0019531 gal.

### How do you convert teaspoons to US gallons?

Multiply by 0.001302083333.

## Related pages

- [Teaspoons to US gallons](https://atoneplace.net/convert/teaspoons-to-gallons/)
- [1.5 gal to tsp](https://atoneplace.net/convert/1-5-gallons-to-teaspoons/)
- [0.5 tsp to gal](https://atoneplace.net/convert/0-5-teaspoons-to-gallons/)
- [1 tsp to gal](https://atoneplace.net/convert/1-teaspoons-to-gallons/)
- [2 tsp to gal](https://atoneplace.net/convert/2-teaspoons-to-gallons/)
- [2.5 tsp to gal](https://atoneplace.net/convert/2-5-teaspoons-to-gallons/)
- [3 tsp to gal](https://atoneplace.net/convert/3-teaspoons-to-gallons/)
- [4 tsp to gal](https://atoneplace.net/convert/4-teaspoons-to-gallons/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)