Angle converter

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Angle conversion

protractor and compass. angle converter degree, grade, radian, steradian © Constantinos - Fotolia

Angles are used in geometry, trigonometry, geography, topography and astronomy to measure space between 2 crossing lines (secants).

This angle converter will allow you to simultaneously convert plane angles between common units.

Geographic coordinates of the Global Positionning System (GPS) are expressed in the sexagesimal system (WGS84).
For example for the Greenwich latitude is 51° 28' 59'' 671 North or 51.4832419444° North (longitude is 0° west)

	degree it is the plane angle the most widely used. Protractors are usually scaled in degrees as in the picture	radian is the official SI plane angle unit	grade or gon
whole turn	360°	2π rd (π, spelt "Pi", is the ratio of a circle's circumference to its diameter, π=3.1415926535...)	400 gon
straight line	180°	π rd	200 gon
right angle	90°	π/2 rd	100 gon

Enter the angle in the second column of the following array and the conversion will be performed automatically in all other units.

Sexagesimal coordinates as in the GPS geodesic system
Degree °	Minute of arc '	arcsecond ''	thousandth of ''

degree °

radian rd

grade (gr) gon

turn/cycle/circle tr

right angle quadrant

military thousandth OTAN mil

Warsaw pact thousandth

thousandth (Sweden)

point

hour (out of 24)

hour (out of 12)

minute of arc '

arcsecond ''

The selected angle is displayed in green on the following protractor picture :

Angle conversion of solid angle of a cone to an apex plane angle

apex of a pyramid from user:Bromskloss (Wikicommons)

A solid angle is similar in 3 dimensions to a plane angle in 2 dimensions.
A solid angle Ω is equal to the ratio of the viewed surface A divided by the square of the viewed distance r.
Ω=A/r^2
It is expressed in steradian (sr), the official SI unit - international system of units. It is comprised of numbers between 0 and 4π sr for a whole sphere.

For a regular cones, solid angle Ω is equal to Ω =2 π x (1 - cos(θ/2))
where θ is the plane angle of a cone apex. For example, a hemisphère (half ball) has a plan angle θ of π rd and a solid angle of 2π sr
If we reverse the previous formula, we can deduct the plane angle θ from the solid angle Ω :
θ = 2 x arccos(1- Ω/2π)
For example, the apparent diameter of the moon seen from earth is θ=0.5 °, which is equivalent to a solid angle of about 6e-5 steradian.
Reading eyes vision field is θ=3 ° (0.002 sr) (foveal zone).
The peripheral vision field of eyes is about θ=25 ° (ellipse shape with -15° left, +15 ° right, -8° high, +12° low) so about 0.15 sr.

The following field is a solid angle Ω of a regular cone whose plane angle θ is indicated on the top array.

steradian sr

Angle converter

Angle conversion

Angle conversion of solid angle of a cone to an apex plane angle

Note