What is the minimum font size for church slides?

It depends on your room. For a 12 m deep room with a 2 m tall image, the calculator gives 48 px or more on a 1920 by 1080 slide.

How do I measure the back row distance?

Measure from the screen to the farthest seat, in a straight line. Use the height of the picture on the screen, not the height of the screen frame.

A Sermon Slides deck is 16:9, 1920 by 1080 pixels, and the calculator works on that size.

No. It is a rule of thumb for planning, so check it by reading a test slide from your back row.

Yes. Switch the units to feet and enter your measurements; the result is still a font size in pixels.

Find the smallest font size your back row can read from your room depth and screen height. A 12 m room with a 2 m image needs 48 px or more.

Free to use. Runs in your browser.

Two measurements in
You enter the distance to your back row and the height of the screen image, in metres or feet.
A letter height out
The minimum letter height is 1/200 of the back-row distance. It also shows what the 4 mm per metre rule asks for, and warns when the back row is farther than six times the image height.
Turned into pixels
That letter height becomes a minimum font size on a 1920 by 1080 slide, rounded up to the next 4 px. The default room, 12 m deep with a 2 m tall image, gives letters of at least 60 mm and 48 px (46 px calculated, rounded up).
A guide, not a standard
These are rules of thumb for planning. Stand in your back row and read a test slide before Sunday.

Paste your sermon, check the outline and edit the slides. Download PowerPoint or PDF.

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