John, That's very close to a "triple-and-add-zero" rule, which I use for ounces all the time. For liquids 12 oz equals 360 ml, 20 oz equals 600 ml, etc, which is certainly close enough. For solids 8 oz equals 240 g, 16 oz equals 480 g, etc, which a bit overestimates but then you can knock off 5% like figuring a tip.
So I would think your triple-and-add-zero rule is close enough for cubic feet. Nat -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of john mercer Sent: Thursday, 2004 May 20 13:43 To: U.S. Metric Association Subject: [USMA:29883] conversion Hello what is a good rule of thumb conversion between cubic ft and liters? Is 1 cubic ft = 28 l good enough or is it too far off. I think the exact conversion factor is 1 cubic ft = 28.316 l. Thanks for your help.
