Some measurement equivalents I can do in my head, no problem. But others trip me up a little. I've been known to google conversions a time or two, which is inconvenient and silly. A better solution? A practically indestructible stainless steel refrigerator magnet that lays it all out for me.
These heavy-duty, no-fuss conversion magnets from Amco are great. I particularly like the recipe divider magnet (the first photo) which divides or multiplies recipes in halves or thirds.
Yes, you can find conversion magnets super cheap or even free, but the minimalism and durability of these stainless steel versions is nice, especially since they don't come with any garish company logos or advertisements!
(Images: as linked)