The best way to be sized is by a professional at a local jewelry store.  VERY IMPORTANTLY,  you need to be sized using wedding band gauges (wedding band gauges are about 6 mm wide). Once you have the size gauge that fits you best, if possible,  have the jeweler check the gauges on a standard US sizing stick for accuracy. 

If you'd prefer to do this in the comfort of your own home, we do keep wedding band gauges for sizing, and will ship them to you so we are certain of your correct size.  This service is free of charge for 10K or 14K rings and a charge of $5.00 for silver rings.  If you would like to take advantage of this service or have any questions please do not hesitate to contact us.  We can be reached at 609-585-4127.