Chart Distance Calculator

Calculate nautical distance from chart measurements.

Chart Distance (cm)

Chart Scale (1:N)

Formula

Real Distance = Chart Distance x Scale; NM = km / 1.852

How do I measure distance on a nautical chart?

Measure with dividers and compare to the latitude scale.

What scale are most coastal charts?

Coastal charts are typically 1:40000 to 1:80000 scale.

Convert nautical miles to kilometers and statute miles.

Estimate tide height at a given time between high and low.