At Google.com enter
2.54 cm to inches
Now that’s cool, but try
3 furlongs per fortnight to parsecs per millisecond.
Now that is really, really cool.
Well. Thats cool.
Hey, the sign says “Mundane Pointless”, ok?
I was being sincere 
Next time I want to run a horse to Alpha Centauri that will come in real handy…
And that’s not a flame. If it’ll do that obscure conversion, it’ll probably do a lot more helpful ones. Pretty cool!
Now that is cool!
I just did the following:
27 miles per gallon to leagues per oz
But it won’t do drams.
I was being facetious.
Even if your teacher wants you to do the conversion by hand, it’s useful when you forget the exact number of [whatevers] in a [what have you].
Well my website has a lot of converters:
http://www.1728.com/indexcon.htm
It does not require a lot of typing unlike a certain search engine that shall remain nameless. Also, my converters don’t use that “from to” foolishness.
And since people were mentioning some velocity problems here’s a handy calculator:
http://www.1728.com/velocity.htm
This will accept 2 of 3 variables (velocity, time or distance - each with 12 units) and calculate the 3rd and output it in 12 units.
Example: You travel for 7 minutes and cover a distance of 4,573 yards. What is your velocity?
9,956.1 millimeters per second
1,959.9 Feet per minute
995.61 centimeters per second
391.97 inches per second …
and so on.
I was basking in frivolity
What good is it if it can’t convert apples to oranges?
Can’t convert lead into gold, either.
How about straw into gold.
Talk to who? Rummplesti…
Oh.
Hmph. It won’t convert 40 rods to the hogshead into anything else. I’m not impressed.
You can even do calculations and specify units for the result. For example, a car is travelling at at 45 mph, and you want to know how many meters it travels in one second. Just enter “45 mph * 1 sec in meter” into Google and you get “20.1168 meter”.
Very cool The calculation is extra-neat 
but but but…
It’s not doing anything when I tell it I want to convert
pi rpm to arcseconds per millisecond
Just a list of links…
Oh yeah
27 slugs per day^4 to kilograms per (fortnight^3 * second)
Abe? Is that you?
And you can do it from any US or UK cell phone with SMS messages.