Measure the usable space
Open the drawer fully and measure the inside width, depth and height. Use the narrowest part of the interior: runners, curved sides and fixings can reduce the usable space. Write the measurements down and photograph the drawer.
Allow room for movement
Compare the organizer’s external dimensions, not the dimensions of its compartments. Leave space for the drawer to close without touching handles or tall utensils. With adjustable dividers, check both the minimum and maximum size.
Test the layout with paper
Cut rectangles from scrap paper to match the proposed organizers. Place them in the drawer and arrange your actual utensils on top. This makes wasted corners and oversized compartments easier to spot before you spend anything.
Buy for the things you keep
Sort the drawer first. Give frequently used tools the easiest positions, then choose the smallest number of organizers that supports that arrangement. Save your measurements for future purchases.