# Nautical Mile Calculator

URL: https://speedycalculator.com/calculators/everyday-life/nautical-mile/
Last updated: 2026-10-25

> The nautical mile calculator converts nautical miles to miles, kilometres and feet, and solves speed, distance and time problems in knots for sailing and aviation.

## Inputs

- Distance (nmi, mi, km, m)
- Speed (knots, mph, km/h)

## Results

- Distance in nautical miles
- In statute miles
- In kilometres
- Time at this speed
- Degrees of latitude

## Formula

```
1 nautical mile = 1,852 m = 1.15078 mi = 6,076.1 ft
1 knot = 1 nautical mile per hour
Distance (nmi) = speed (kn) × time (h)
```

## Explanation

A nautical mile was originally one minute of latitude, which is why navigators use it with charts: one degree of latitude is 60 nautical miles. Since 1929 it has been defined as exactly 1,852 metres. Ships and aircraft measure speed in knots.

### How to use the Nautical Mile Calculator

- **Distance**
- **Speed**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the distance in nautical miles (or any unit) to convert it, and a speed in knots to see how long the passage takes.

### Tips

- Use your own measured figures – fuel economy, speed and prices vary a lot with driving style, traffic, load and season.
- Pick the unit in each field's menu (miles or kilometres, mpg or L/100 km); the calculator converts everything for you.
- Fill up to the brim twice and divide the distance by the fuel added to measure real fuel economy.
- For vehicle modifications, treat results as a starting point and confirm with the parts maker or a professional mechanic.

### Common mistakes to avoid

- Mixing US and imperial (UK) gallons – a UK gallon is about 20% bigger.
- Using the advertised fuel economy instead of real-world figures.
- Forgetting tolls, parking and wear and tear when comparing driving with public transport.

### Inputs explained

FieldWhat to enterDistanceUnits: nmi, mi, km, mSpeedUnits: knots, mph, km/h

### What each result means

- **Time at this speed** = [Distance]÷[Speed]÷3600
- **Degrees of latitude** = [Distance]÷1852÷60

## Worked example

Inputs — Distance: 100 nmi; Speed: 12 knots.

Results — Distance in nautical miles = 100 nmi; In statute miles = 115.078 mi; In kilometres = 185.2 km; **Time at this speed = 8 h 20 min**; Degrees of latitude = 1.6667 °.

## FAQ

**Why is a nautical mile longer than a mile?**
It is based on the Earth's circumference – one minute of latitude – rather than on 5,280 feet.

**How fast is 1 knot?**
1.15078 mph or 1.852 km/h.

**Why do pilots use nautical miles?**
Because they relate directly to latitude and longitude on charts.

**What formula does the Nautical Mile Calculator use?**
1 nautical mile = 1,852 m = 1.15078 mi = 6,076.1 ft.


## Sources

- [International Hydrographic Organization – definition of the nautical mile](https://iho.int/)