Home developing question

[DIW35]

For many years I have been a 35mm shooter, but have recently taken up shooting medium format.

When it comes to home developing, many manufacturers list the film capacity of their fixr as so many rolls of 36 exposure 35 mm films. Is there a recognised or easy way to convert that to work out what the equivalent capacity is for 120 roll film?

I'm developing black and white film, though I don't think that should make any difference.

[Speed addicted]

Work out the surface area I suppose?

[Speed addicted]

Ok Google reckons that medium format has approx 4 times the surface area of 35mm, so a quarter of the shots before the fixer is depleted.
Probably.

[Simpo Two]

Speed addicted said:

Ok Google reckons that medium format has approx 4 times the surface area of 35mm, so a quarter of the shots before the fixer is depleted.

Of course, back in the days of film they'd have worked that out without forums or Google

[Speed addicted]

Simpo Two said:

Speed addicted said:

Ok Google reckons that medium format has approx 4 times the surface area of 35mm, so a quarter of the shots before the fixer is depleted.

Of course, back in the days of film they'd have worked that out without forums or Google

Back in the day they d have seen medium format film in real life!
I had no idea how big it was…