N5PA Ham Radio Tools Page

Bearing and Distance Calculator

Enter the origin and destination latitude/longitude and click the "Calc" button. You may enter the latitudes/longitudes in DD.DD, DD:MM.MM or DD:MM:SS.SS formats. You can change the default entry to calculate other coordinates.

Enter Origin & Destination Coordinates
Origin Latitude
Origin Longitude
Destination Latitude
Destination Longitude

Bearing From Origin
Bearing From Destination
Distance in Miles
Distance in Kilometers

Distance Units:


Calculate your Maidenhead Grid Square

To calculate your Maidenhead Grid Square, enter the latitudes in a format of 37.1678 and the longitude in the format "-071.2334" and click the "Calc" button. Northern Latitudes are Positive and Southern Latitudes are Negative. Eastern Longitudes are Positive and Western Longitudes are Negative. To clear the form and enter another set of longitudes and latitudes, click the "Reset" button.

Enter Latitude
Enter Longitude

Convert Degrees to Compass Bearing

To convert degrees to a compass bearing, enter the degrees and click the "Calc" button. To clear the form and enter another degree to calculate, click the "Reset" button.

Key Direction in Degrees

Convert Kilometers to Miles

To convert Kilometers to Miles, enter Kilometers and click the "Convert to Miles" button. To clear the form and enter another Kilometer reading, click the "Reset" button.

Enter Kilometers

Convert Miles to Kilometers

To convert Miles to Kilometers, enter Miles and click the "Convert to Kilometers" button. To clear the form and enter another Miles reading, click the "Reset" button.

Enter Miles

Calculate Sides of Triangles and Angles

When you are putting up a tower or working with other ham radio related items that require the lengths of the sides of triangles or their angle in degrees, this program can do the calculations for you.

This calculator is designed to give the two unknown factors in a right triangle, assuming two factors are known. This calculator is for a right triangle only! The factors are the lengths of the sides and one of the two angles, other than the right angle. All values should be in positive values but decimals are allowed and valid. Fill in two (only two) values then click on Calculate. The other two other modifiable values will be filled in, along with the angle 3 field. In a triangle, all interior angles total to 180 degrees. No two angles can total to 180 degrees or more. Angle C is always 90 degrees; angle 3 is either angle B or angle A, whichever is NOT entered. Angle 3 and Angle C fields are NOT user modifiable.

Again, this right triangle calculator works when you fill in 2 fields in the triangle angles, or the triangle sides. Angle C and angle 3 cannot be entered.

Required Data Entry
Right Triangle Calculator
Side a Length
Side b Length
Side c Length
Angle A or B Degrees
Angle C Degrees
Angle 3 Degrees
Decimal Places