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Image Size, Throw Distance & Beam Angle Calculator

Ever needed to project a gobo or image to be a specific size but dont know what beam angle you need? Want to know how big the pool of light will be from your lantern? Want to calculate how far away you need to place a lantern?

Now you can! Using a little java script and simple trigonometry, fill in what you know and click the button to calculate the missing number

Throw Distance Units
Beam Angle Degrees
Image / Beam Size Units

Notes: The angle must be in degrees, Distance & Size can be either feet or meter - the answer will be what you put in the same units as you put in. You cant mix though, dont try a 3ft image size with a 5m throw distance - The answer will be wrong!!!

This little calculator will work for all lantern manufactures, whether it be Selecon Pacific, an ETC Source 4 Profile, an Robert Juliat Followspot, Robe Moving Light - its only trigonometry.

All equipment is available for hire, sales, installation or used on productions across the UK. Based in Bath; Bristol, Swindon, Salisbury, Gloucestershire, London, Birmingham and the South West are all within easy reach. Enlightened specialise in equipment and services for Theatre Lighting, Concert Lighting, Outdoor Events, Theatre Tours, Fashion Show, Product Launches, Music Festivals, University Balls, Conference Lighting, Rock 'n' Roll Tours, Exhibition Lighting and all other Events.

Our most popular equipment includes: Robe Moving Lights, Milos Truss, Doughty Winch Stands, Avolites Desks, Chamsys, Followspots, ETC Lanterns, Zero 88 equipment, Anolis LED