Barco Projector Throw Calculator: Find the Right Lens

The Barco projector throw calculator determines the required throw distance or screen width for a Barco projector based on its lens and the desired image size. You enter the projector model, lens type, and either screen width or throw distance, and the calculator returns the matching throw distance, screen width, or zoom range. This tool is essential for planning an installation before you mount the projector or order a lens.

Formula

The basic throw ratio formula is:

Throw Ratio = Throw Distance / Screen Width

Where:

• Throw Distance – the distance in meters (or feet) from the projector lens to the screen surface.
• Screen Width – the width of the projected image in meters (or feet), not the diagonal.

Most Barco projectors have a zoom lens with a range, so the actual throw ratio is a range (e.g., 1.5–2.0:1). The calculator above uses a single ratio for simplicity; for a zoom lens, use the minimum and maximum values to get the range of possible distances.

Worked Example

Using the default values from the calculator:

• Screen width = 3 m
• Throw distance = 10 m
• Lens zoom ratio = 1.5

First, compute the required throw distance for a 3 m wide screen with a 1.5:1 lens:

Throw distance = 3 m × 1.5 = 4.5 m

Next, compute the maximum screen width for a 10 m throw distance with the same lens:

Screen width = 10 m / 1.5 = 6.67 m

So with a 1.5:1 lens, a 3 m wide screen needs the projector 4.5 m away, and at 10 m away the same lens will fill a 6.67 m wide screen.

How Barco Throw Calculators Work

Barco provides an official online tool (the Barco Projector Simulator) that covers most of their projector series. You select a projector model, then choose a lens from the available options. The tool then shows a visual representation of the room and lets you adjust throw distance, screen width, and even screen height. It calculates the image size, brightness (in lumens per square meter), and whether the lens can achieve the desired image at that distance.

The underlying math is the same as above, but the official tool has a database of lenses with their specific minimum and maximum throw ratios. For example, a Barco projector with a standard zoom lens might have a throw ratio of 1.5–2.0:1, meaning at a 3 m screen width, the projector can be placed between 4.5 m and 6.0 m away.

Choosing the Right Lens for Your Room

Selecting the correct lens is the most common reason to use a throw calculator. Here are the steps:

1. Measure your room – note the distance from the projector mount to the screen (throw distance) and the desired screen width.
2. Calculate the throw ratio – divide the throw distance by the screen width. For example, 10 m / 4 m = 2.5.
3. Find a lens with that ratio – look for a lens whose throw ratio range includes 2.5. If your room gives a ratio of 2.5, a lens with a range of 2.0–3.0 will work.
4. Check the zoom range – if you need flexibility (e.g., to adjust image size later), choose a lens with a wider zoom range.
5. Verify with the calculator – enter the lens’s min and max ratios to confirm the projector can be placed within your room’s constraints.

Common Mistakes and Misconceptions

One frequent error is using the screen diagonal instead of the width. Throw ratio is always based on screen width, not diagonal. For a 16:9 screen, the width is roughly 0.87 times the diagonal, so a 100-inch diagonal screen is about 87 inches wide (2.21 m).

Another mistake is ignoring the lens shift. Barco projectors often have vertical and horizontal lens shift, which lets you move the image without moving the projector. This does not affect throw distance, but it affects where the projector can be mounted relative to the screen center. Always check the lens shift range in the specs.

Also, remember that the throw ratio is measured from the lens, not the back of the projector. When measuring your room, subtract the projector’s depth from the total distance if you are measuring from the wall or ceiling mount.

Limitations of the Simple Formula

The simple formula works for most installations, but Barco projectors with ultra-short-throw or long-throw lenses may have slight variations due to optical design. Some lenses have a fixed throw ratio (no zoom), while others have a motorized zoom that changes the ratio over a range. The official Barco simulator accounts for these variations, so it is more accurate than a generic calculator.

Another limitation is that the formula assumes a flat screen and a projector perpendicular to it. If you use keystone correction (angling the projector), the effective throw distance changes slightly, and the image may have distortion. For critical installations, use the official tool and consult the lens datasheet.

Alternatives to the Barco Tool

If you are not using a Barco projector, many other manufacturers offer similar calculators. For example, Epson, Panasonic, and Sony have online tools. Generic throw calculators (like the one on this page) work for any projector if you know the lens throw ratio. You can also use a simple spreadsheet with the formula above.

For outdoor or large-venue installations, you may need to consider ambient light, screen gain, and brightness. The throw distance only affects image size, not brightness. To calculate brightness, you need the projector’s lumens and the screen area – but that is a separate calculation.

Frequently Asked Questions

What is a good throw ratio for a home theater?

For a typical home theater with a projector placed on the ceiling at the back of the room, a throw ratio of 1.5–2.0:1 is common. If your room is shallow, you might need a short-throw lens with a ratio of 0.5–1.0:1. Measure your room first, then choose a lens that fits.

Can I use a Barco projector without a lens?

No, Barco projectors do not come with a built-in lens; you must purchase a lens separately. The lens is a major part of the cost, so factor it into your budget. The throw calculator helps you choose the right lens, but you also need to ensure the lens mount is compatible with your projector model.

Does the throw calculator work for all Barco models?

The official Barco simulator covers most current models, but older or niche models may not be listed. If your model is not there, you can use the lens throw ratio from the datasheet and apply the simple formula. The formula is universal, so the calculator on this page will work as long as you have the ratio.

What is the difference between throw ratio and zoom ratio?

Throw ratio is the distance divided by screen width. Zoom ratio is the maximum throw ratio divided by the minimum throw ratio. For example, a lens with a throw ratio range of 1.5–2.0 has a zoom ratio of 1.33 (2.0/1.5). The zoom ratio tells you how much you can adjust the image size without moving the projector.

How do I measure the screen width correctly?

Measure the visible screen area from left to right, not the diagonal. If you have a 16:9 screen, you can also calculate the width from the diagonal by multiplying by 0.871. For a 4:3 screen, multiply the diagonal by 0.8. Always use the same unit (meters or feet) for both distance and width.

Can I use the calculator for a projector with a fixed lens?

Yes, just enter the fixed throw ratio for the lens. For example, a 0.8:1 fixed lens means the projector must be exactly 0.8 times the screen width away. There is no zoom range, so the distance is fixed for a given screen size.

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in width | Screen width | m | 3 | 0
in dist | Throw distance | m | 10 | 0
in ratio | Lens zoom ratio | - | 1.5 | 0
out throw | Required throw distance | m | width * ratio | 2
out screen | Max screen width | m | dist / ratio | 2