By Deane Barker on July 1, 2005

Num Sum: Here’s a great little app for creating small, simple speadsheets online and sharing them.

  • The Pizza Calculator shows you the price per square inch of pizza based on the size you buy — it’s fully a third less per inch when you buy a 20-inch over an 8-inch, assuming his pricing model is correct.

  • The Temperature Convertor is handy.

  • Here’s a simple matrix of Julian dates for 2005.

There’s a lot of junk out there (everyone is still testing, after all), but NumSum has tags so you can search for all the calculators or anything to do with comparisons, etc.

Besides the gee-whiz factor, here’s how this is valuable: it can teach theory. With something like this, you get an easy way for someone to explain how a particular formula or theory works. Instead of just reading about it or just looking at a flat report of it, they can experiment and being to understand.

Like a lot of stuff lately, this one is from Waxy via Lifehacker.

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