I now unveil one of my all-time favorite sites. It’s something I only use occasionally in my current deadline news job. But I used to use it all the time when I made historical documentaries. And you could get lost for hours just playing with numbers on the site.

So with that buildup, what is it?

Measuring Worth is the latest incarnation of an online calculator run by two University of Illinois economics professors. The site lets you put in a currency amount from any year back to 1774, and convert that to the value in any other year. Most commonly, you’d use it to figure out, for example, what $30 in 1910 is worth today. The answer, of course, isn’t as simple as $710. That’s just the figure calculated using the Consumer Price Index. But the authors’ basic calculator gives you five other measures (GDP deflator, comparative payment for unskilled labor, etc.) which generate a figure as high as $13,200 (for relative share of GDP). It can also handle various foreign currencies and various other ways of calculating relative value.

So, unfortunately, while Measuring Worth a great tool, there’s a learning curve (handy essays included) to figuring out what all the numbers mean and which is appropriate for your purpose. But if you need to calculate the historical Value of a Dollar (the site’s original name), this is the tool for the job.

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