On Stage Lighting presents a simple Beam Angle Calculator to help you find the correct spotlight for your show.

If you need to project a gobo image to a certain size or the pool of a spotlight to be a specific width , you need to find out the beam angle . The calculation to find Beam Angle using the Throw Distance/Beam Diameter is simple trigonometry that we have compiled into the Beam Angle Calculator using Javascript.

Update:// There are now quite a few stage lighting calculators for your iPhone. Look at out Stage Lighting iPhone Apps page

Throw Distance:
Units

Beam Width/Diameter:
Units

degrees

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On Stage Lighting has a ton of stuff like this. You may also like:

• Which Stage Spotlights Should I Use For My Show?
• PAR 64 Bulbs – A Guide to PAR 64 Lamp Sizes
• Gobos – A Guide To Choosing And Using A Gobo
• Focus Stage Lighting – Turn Your Back On It!
• LED Stage Lighting – Why Buy RGB LED Stage Lights?
• Stage Lighting Hire – What You Need To Know

Rob is a freelance Lighting Designer and Moving Light Programmer currently lecturing in technical theatre production at Bath Spa University in the UK. He is also the Editor of On Stage Lighting and runs workshops in stage lighting practice.

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