---
title: "US cups to Imperial gallons — cup to imp gal converter"
description: "1 US cup = 0.052042 imperial gallons. Convert US cups to imperial gallons with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/cups-to-imperial-gallons/
site: "At One Place"
---

# US cups to imperial gallons

**1 US cup in imperial gallons: 1 cup = 0.052042 imp gal**

imp gal = cup × 0.05204213654

To convert US cups to imperial gallons, multiply by 0.05204213654. The table below gives the values people look up most often, and the converter works for any number.

## US cups to imperial gallons table

*Common US cup values converted to imperial gallons.*

| US cups | Imperial gallons |
| --- | --- |
| 1 cup | 0.052042 |
| 2 cup | 0.10408 |
| 3 cup | 0.15613 |
| 4 cup | 0.20817 |
| 5 cup | 0.26021 |
| 10 cup | 0.52042 |
| 15 cup | 0.78063 |
| 20 cup | 1.040843 |
| 25 cup | 1.301053 |
| 30 cup | 1.561264 |
| 40 cup | 2.081685 |
| 50 cup | 2.602107 |
| 75 cup | 3.90316 |
| 100 cup | 5.204214 |
| 250 cup | 13.01053 |
| 500 cup | 26.02107 |
| 1,000 cup | 52.04214 |

## How the conversion works

The relationship is imp gal = cup × 0.05204213654. 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 cup: US legal cup is 240 mL; the customary cup used here is 236.588 mL.

> Imperial gallon: UK gallon.

## Common questions

### How many imperial gallons are in one US cup?

One US cup equals 0.052042 imperial gallons. imp gal = cup × 0.05204213654.

### How do you convert US cups to imperial gallons?

Use imp gal = cup × 0.05204213654. So 10 cup is 0.52042 imp gal.

### How many US cups are in one imperial gallon?

One imperial gallon equals 19.2152 US cups, which is the reverse of the conversion above.

### Is there more than one kind of US cup?

US legal cup is 240 mL; the customary cup used here is 236.588 mL. UK gallon.

## Related pages

- [Imperial gallons to US cups](https://atoneplace.net/convert/imperial-gallons-to-cups/)
- [US cups to Liters](https://atoneplace.net/convert/cups-to-liters/)
- [US cups to Milliliters](https://atoneplace.net/convert/cups-to-ml/)
- [US cups to Cubic meters](https://atoneplace.net/convert/cups-to-cubic-meters/)
- [US cups to US gallons](https://atoneplace.net/convert/cups-to-gallons/)
- [US cups to US quarts](https://atoneplace.net/convert/cups-to-quarts/)
- [US cups to US pints](https://atoneplace.net/convert/cups-to-pints/)
- [US cups to US fluid ounces](https://atoneplace.net/convert/cups-to-fl-oz/)
- [US cups to Tablespoons](https://atoneplace.net/convert/cups-to-tablespoons/)
- [US cups to Teaspoons](https://atoneplace.net/convert/cups-to-teaspoons/)

## 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/)