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# Error propagation for values with different units of measurment watch

1. Hi, I'm having trouble calculating the error for my data, essentially the equation is as follow F=x/y where x is in nanometres where y is in millimeters

atm im using (error of F)^2 = (error on y)^2 +(error on x)^2 I assume this is correct?

I'm not to sure if i need to leave the units the same or make some sort of common unit, could someone help me out.
Thanks
2. (Original post by Walex12108)
Hi, I'm having trouble calculating the error for my data, essentially the equation is as follow F=x/y where x is in nanometres where y is in millimeters

atm im using (error of F)^2 = (error on y)^2 +(error on x)^2 I assume this is correct?

I'm not to sure if i need to leave the units the same or make some sort of common unit, could someone help me out.
Thanks
You'll need to convert the errors in each to a common unit. If you choose SI, then make sure to use standard notation.

The equation should be error of F = error of y + error of x. No squares involved.

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Updated: January 31, 2016
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