N5PA Website

N5PA Ham Radio Tools Page

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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
	N S		W E
Destination Latitude		Destination Longitude
	N S		W E

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

Distance Units: nm km sm

Model: Spherical (1'=1nm) WGS84/NAD83/GRS80 Clarke (1866)/NAD27 International Krasovsky Bessel (1841) WGS72 WGS66 User defined

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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

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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

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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

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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

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Convert Knots to Miles per Hour

1 Knot = 1.15077944802354 Miles per Hour

Knots

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Convert to Degrees in Different Formats and Calculate Grid Square

You can use any one of the 3 formats below to convert to the other 2 formats. The first option is to Convert from Degrees in DD-MM-SS format to the other 2 formats. The second option is to Convert from Degrees and Decimal Degrees like 31.6882 and -93.4486 to the other 2 formats. North and East are Positive numbers and South and West are Negative numbers. The third option is the Maidenhead Grid Square and you enter either a 4 or 6 character Grid Square and it calculates the other 2 formats. The Convert button converts the Maidenhead Grid Square to the 2 Degree formats. The Reset button clears and rebuilds the page.

Degrees in Degrees-Minutes-Seconds Format:
Latitude:	°  '  "
Longitude:	°  '  "
Degrees in Decimal Format:
Latitude:	°  Positive: North, Negative: South.
Longitude	°  Positive: East, Negative: West.
QTH Grid Square (4 or 6 Characters):
Grid Square:

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Convert Deg, Min, Sec Enter Coordinates in Deg Min Sec: DD  MM  SS  GPS Coordinates  deg  min Decimal Degrees

Convert Decimal Degrees Enter a Coordinate in Decimal Degrees:    GPS Coordinates  deg  min DDMMSS DD  MM  SS

Convert GPS Coordinates Enter a Coordinate in GPS Coordinates:    deg    min Decimal Degrees DDMMSS DD  MM  SS

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Convert Metric and US Unit Measures

Length
Metric			US
Micrometers				Inches (in)
Millimeters (mm)				Feet (ft)
Centimeters (cm)				Yards (yd)
Meters (m)				Rods (rd)
Kilometers (km)				Miles (mi)

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Convert Common Metric & US Weight Units

Enter Quantity to Convert:
From: centigram decigram dekagram dram grain gram hectogram hundredweight [long, UK] hundredweight [short, US] kilogram lb, lbs long ton megagram metric ton microgram milligram ounce pound short ton ton [long, UK] ton [metric] ton [short, US] tonne	To: centigram decigram dekagram dram grain gram hectogram hundredweight [long, UK] hundredweight [short, US] kilogram lb, lbs long ton megagram metric ton microgram milligram ounce pound short ton ton [long, UK] ton [metric] ton [short, US] tonne
Result:

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Prime Number Calculator

Please enter a number:

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Three Percent Calculators in One

What is % of ?		Answer:
is what percent of ?		Answer: %
is % of what?		Answer:

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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
Unit	Number
Side a	Length
Side b	Length
Side c	Length
Angle A or B	Degrees
Angle C	Degrees
Angle 3	Degrees
Decimal Places	0 1 2 3 4 5 Maximum

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