Throw and Lumens Calculator

Projector throw distance and required brightness calculator

Inputs

Throw Distance

Image Width

Aspect Ratio

Target Brightness≥80 for bright rooms

Screen Gain

Throw Ratio

1.50 :1

Lens Type

Standard

Results

Required Lumens

4,500Lm

Screen Area

56.3ft²

References

Throw Ratio = Throw Distance ÷ Image Width = 15 ÷ 10 = 1.50:1

Screen Area = Width × (Width ÷ Aspect) = 10 × 5.63 = 56.3 ft²

Required Lumens = (Brightness × Area) ÷ Gain = (80 × 56.3) ÷ 1 = 4,500 Lm

Lens Classification: UST < 0.5 | Short Throw 0.5–1.0 | Standard 1.0–2.0 | Long Throw > 2.0

Brightness Guide: 20–30 fL dark rooms | 40–60 fL ambient light | 80+ fL bright rooms

Screen Gain: 1.0 = matte white | 1.3+ = high gain | 0.8 = ALR