user1062: I'm shooting 3-perf 35mm @ 24 fps. How many feet of film do I need if I'm shooting one hour?
Is there a good site/app for calculating this?
Note: This is a repost of an off-topic/closed question I asked on Photography - Stack Exchange.

user1890: 4,051 feet of film.
For reference:

8mm = 80.0 frames per foot
Super 8 = 72.0 frames per foot
16mm = 40.0 frames per foot
35mm 2-perf = 32.0 frames per foot
35mm 3-perf = 21.3 frames per foot
35mm = 16.0 frames per foot
65mm = 12.8 frames per foot

The math: 

60 minutes = 3600 seconds, 3600 sec x 24 fps = 86,400 frames, 86,400/21.333 = 4,050.06328

Tools for Calculating
Kodak makes a free app for iOS called "KODAK Cinema Tools" which has a film calculator, among other features.
http://motion.kodak.com/US/en/motion/Tools/Mobile/index.htm
Panavision has a simple website with a film footage, frame and running time calculator:
http://www.panavision.co.nz/main/kbase/reference/calcfootage.asp

1062: <p>I'm shooting 3-perf 35mm @ 24 fps. How many feet of film do I need if I'm shooting one hour?</p>

<p>Is there a good site/app for calculating this?</p>

<p>Note: This is a repost of <a href="https://photo.stackexchange.com/questions/638/how-much-film-do-i-need-in-feet-meters">an off-topic/closed question</a> I asked on Photography - Stack Exchange.</p>
 1890: <p>4,051 feet of film.</p>

<p>For reference:</p>

<ul>
<li>8mm = 80.0 frames per foot</li>
<li>Super 8 = 72.0 frames per foot</li>
<li>16mm = 40.0 frames per foot</li>
<li>35mm 2-perf = 32.0 frames per foot</li>
<li>35mm 3-perf = 21.3 frames per foot</li>
<li>35mm = 16.0 frames per foot</li>
<li>65mm = 12.8 frames per foot</li>
</ul>

<p>The math: </p>

<blockquote>
  <p>60 minutes = 3600 seconds, 3600 sec x 24 fps = 86,400 frames, 86,400/21.333 = 4,050.06328</p>
</blockquote>

<p><strong>Tools for Calculating</strong></p>

<p>Kodak makes a free app for iOS called "KODAK Cinema Tools" which has a film calculator, among other features.</p>

<p><a href="http://motion.kodak.com/US/en/motion/Tools/Mobile/index.htm" rel="nofollow">http://motion.kodak.com/US/en/motion/Tools/Mobile/index.htm</a></p>

<p>Panavision has a simple website with a film footage, frame and running time calculator:</p>

<p><a href="http://www.panavision.co.nz/main/kbase/reference/calcfootage.asp" rel="nofollow">http://www.panavision.co.nz/main/kbase/reference/calcfootage.asp</a></p>
