Tool

Headlight aiming wall chart

This helper uses the same geometry as the aim calculator. You enter lamp height, wall distance, and the cutoff line height you want on the wall. Drop is lamp height minus line height. Angle is the inverse tangent of drop divided by distance, with distance converted to inches. After a valid estimate you can print a wall mark that shows the line in inches and centimeters. The figure is not a manufacturer wall chart and not a shop procedure.

Tap Example to fill a 26 in lamp and a 24 in line at 25 ft. Then change the line to the mark you actually taped.

Units on the tape

Inches and feet Centimeters and meters

Lamp height (inches)

Distance to the wall (feet)

A common garage check uses 25 ft.

Cutoff line height on the wall (inches)

This must sit below lamp height for a downward drop.

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Enter height, distance, and the line on the wall. The estimate will report the drop and the angle.

The last numbers stay in this browser. A copied link opens the same fields.

This figure is an educational estimate. It is not a product listing, not DOT or SAE certification, and not legal advice on aftermarket lamps. Aiming and wattage do not make a lamp street-legal. Check the vehicle manual and local law.

When this estimate fits

You already marked a horizontal line on the wall, and you want the drop below the lamp.
You prefer line height as the third field, not drop or angle as on the aim calculator.
You accept that tape on a garage wall is not a certified aiming screen.

Worked numbers from this formula

Lamp at 26 in, line at 24 in, wall at 25 ft: drop is 2 in and the angle is about 0.38°. Does that match the tape?

Lamp at 30 in and a line at 30 in is not a downward drop. The estimate stops at the line field.

The same 2 in drop at 10 ft is about 0.95°. Closer walls make the same drop look like a steeper angle.

Questions

Is this a printable SAE chart?

No. After a valid estimate the page can print a wall mark with the line height you entered. That sheet is not a regulated SAE or FMVSS target.

Why must the line sit below the lamp?

This helper treats drop as downward. A line at or above lamp height is not a downward cutoff, so the estimate does not invent an upward aim.

Which tool should I use?

Use this page when you think in line height. Use the aim calculator when you think in drop or angle. The geometry is the same.

Read the aiming guide before you treat a garage wall as a final check.