US Gallons to Microliters (gal to µL)

1 US gallon equals 3,785,411.784 microliters exactly.

1 US gallon = 3,785,411.784 microliters

How to convert US gallons to microliters

To convert US gallons to microliters, multiply the number of US gallons by 3,785,411.784. This factor is exact. To go the other way, multiply microliters by 2.641720524×10⁻⁷ (rounded).

microliters = US gallons × 3,785,411.784

Example: 10 US gallons = 37,854,117.84 microliters.

Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.

About these units

US Gallon (gal)

US customaryCurrent unit

Exactly 231 cubic inches or 3.785411784 liters (128 US fluid ounces). About 17% smaller than the imperial gallon.

The US gallon is a survivor of English wine trade. Around 1706, a statute in Queen Anne's reign fixed the wine gallon at exactly 231 cubic inches, settling confusion among the competing gallons for wine, ale and corn. British colonies in North America used that wine gallon, and in 1824 Britain replaced all its gallons with a new imperial one while the United States kept the old measure. It was adopted as the legal US standard in 1836 and is still defined as exactly 231 cubic inches, or 3.785411784 liters.

That makes the US gallon about 17 percent smaller than the imperial gallon, a difference that explains why American and British fuel-economy figures cannot be compared directly. Everyday uses are milk jugs, paint cans and gasoline pumps. One gallon divides evenly into four quarts, eight pints, sixteen cups and 128 fluid ounces. A gallon of water weighs a little over 8 pounds, an easy figure to remember when loading a car with water jugs.

1 US gallon = 3.785411784 liters (exactly).

Sources: Wikipedia: Gallon; NIST SP 811, Appendix B.8: conversion factors for volume

Microliter (µL)

Metric (SI)Current unit

One millionth of a liter, equal to one cubic millimeter. Used for very small liquid volumes.

Older laboratory papers often call this volume a lambda, written with the Greek letter, and that name has been discouraged since 2014 in favor of the microliter. The prefix micro, meaning one millionth, entered the metric prefix list in 1873, when the symbol mu was eventually chosen because the capital M was already taken by mega. The unit therefore combines a nineteenth-century prefix with the liter.

One microliter is 10 to the minus 6 liter, which is the same volume as one cubic millimeter and one thousandth of a milliliter. Some medical test results print it as mcL instead of using the Greek letter. Small volumes like this matter wherever tiny samples are pipetted or reported, and the figure used here is exactly 0.000001 liter.

1 microliter = 0.000001 liters (exactly).

Sources: Wikipedia: Litre; Wikipedia: Metric prefix

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