According to the United States Census Bureau, the borough has a total area of 1.3 square miles (3.4 km2), all land.

The National Farm School, now the Delaware Valley University was built near James Manor.

[4] The Sign of the Horses and Wagon was a tavern in the west end of the village, where Lafayette headquartered at the time the Continental Army marched from Valley Forge to Monmouth, New Jersey.

[4] The first dwelling in the village of New Britain was built at the intersection of West Butler Avenue (U.S. Route 202) and Almshouse Road by David Stephens, who purchased land from Joseph Kirkbride, sometime before 1760.

About 1740 they separated from Montgomery calling their church the Society Meeting House, the first pastors William Davis, Joseph Eaton, and Joshua Jones.

[4] New Britain was entered into the Geographic Names Information System on August 30, 1999 as identification 1214971.

The average wettest month is July which corresponds with the annual peak in thunderstorm activity.

Ice storms and large snowstorms depositing ≥ 12 inches (30 cm) of snow occur once every few years, particularly during nor’easters from December through February.

[14] Bucks County Transport operates the DART West bus that serves New Britain, which runs weekdays from Chalfont to a connection with the Doylestown DART bus to Doylestown at Delaware Valley University.

[16] The plant hardiness zone is 6b with an average annual extreme minimum air temperature of −0.6 °F (−18.1 °C).

[11] The spring bloom typically begins by April 11 and fall color usually peaks by October 30.