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Bellatrix's avatar

Do you know of a currency calculator that uses the exchange rate at an earlier date?

Asked by Bellatrix (21228points) September 16th, 2012

I buy a lot of books from overseas for my work. I can claim these books on my tax but the purchase price is often in US$ or British pounds (can’t find the symbol). I am in Australia and so need to calculate the AU$ value at the time I bought the book.

I can find calculators that will convert the value of currency today but not retrospectively. Does anyone know of a site where I can put in a date and a US$ value or other currency and it will calculate the value based on the exchange rate on that earlier date?

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8 Answers

Jeruba's avatar

I’ve seen one. I wanted to see how the value of euros relative to American dollars had changed since I bought some. I found it by some persistent Googling: as I got warmer, I picked up key terms and used them to further my search. I’m pretty sure that it had a variety of currencies to choose from on both sides of the conversion.

I’m not going to sit down now and try to recreate that process, which took a while, but I can at least tell you that I did it and therefore that it can be done.

Bellatrix's avatar

Thanks Jeruba. I will go on a deeper hunt later.

dabbler's avatar

Here’s a site with historical USD/EURO exchange rates.

srmorgan's avatar

You can get this information on Yahoo Finance which will track exchange rates of major currencies (and AUD is a major currency).


Bellatrix's avatar

Thank you everyone for your help with this.

Allie's avatar is the site the campus I work at uses. You can select historical exchange rates and put in your dates and currencies and it does the rest.

Edit: Doh! GA @dabbler :)

dabbler's avatar

@Allie, That is great additional info, and that’s from your own experience using the site.
I only quickly looked at several sites out there and Oanda seems the most capable of providing large amounts of time-series data. I haven’t used any of the online financial data services, though, for several years, free or otherwise.

Lots of corporate accounting and finance systems have in-house historical reference fx rates datasets for analysis and reporting. The ones I’ve seen are constantly using large amounts of time-series fx exchange rates data.

Bellatrix's avatar

Thanks again. This will help a lot with my tax docs.

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