Projector throw calculator

Distance = throw ratio × image width. Enter the ratio from the spec sheet (one value for a fixed lens, two for a zoom), then the image size and shape. Distances are measured from the lens to the screen.

Set to the TK710STi's 0.69–0.83:1 zoom.

Throw ratio, shortest

Throw ratio, longest

Image diagonal

inches

Screen shape

Lens to screen

1.83–2.20 m

6′ 0″ to 7′ 3″

Image size

2.66 × 1.49 m

8′ 9″ × 4′ 11″

Or start from the distance

With the same lens and screen shape, how large an image does a given lens-to-screen distance give?

Lens to screen

metres

Image diagonals from 218″ to 262″ (16:9) at 4.00 m.

Image size120″

Screen shape

Room depth, screen to back wall4.2 m

Lens

Throw–:1

Projector position (or drag it)2.02 m from screen

FitsThe whole zoom range fits. The lens can go anywhere from 1.83 m to 2.20 m from the screen.

Image

2.66 × 1.49 m

8′ 9″ × 4′ 11″

Lens can sit

1.83–2.20 m

6′ 0″ to 7′ 3″

At 2.02 m

✓ Fills the screen at 0.76:1

zoom range 0.69–0.83:1 (1.20×)

Show the numbers

Value	Metric	Imperial
Image width	2.66 m	8′ 9″
Image height	1.49 m	4′ 11″
Nearest lens position	1.83 m	6′ 0″
Furthest lens position	2.20 m	7′ 3″
Room depth needed (+35 cm chassis)	2.18 m	7′ 2″

Top-down view, to scale. A 120-inch 16:9 image is 2.66 m wide. A 0.69–0.83:1 lens must be between 1.83 m and 2.20 m from the screen. The room is 4.2 m deep.

The plan above is to scale. Real lenses are not perfectly linear, so check the projection-distance table on the data sheet when the fit is tight.