# Nautical mile per day conversions

The nautical mile per day conversion selector on this page selects the speed/velocity measurement unit to convert to starting from nautical miles per day (nmi/d). To make a conversion starting from a unit of speed other than nautical mile per day, simply click on the "Reset" button.

## About nautical mile per day

The **nautical mile per day** (or **nautical mile/day**) is a unit of speed equal to 0.021435 meters per second (1 nmi/day = 0.021435 m/s), the derived unit of speed in the International System of Units (SI).

The nautical mile per day (nmi/d) is also equal to about 0.077167 kilometers per hour (km/h), or 0.047949 miles per hour (mph) or 0.070325 feet per second (ft/s).

The speed is the distance traveled by an object during a period of time. Thus, nautical miles per day (or nautical miles/day) show how many nautical miles are traveled in one day. The nautical mile is a unit of length while the day is a unit of time.

The nautical mile per day is used in nautical and air navigation and in meteorology.

Symbol: nmi/d

Plural: nautical miles per day