A 32" waist measurement converts to a US women's size 12–14 in standard sizing.
Brand variation: in straight sizing (Madewell, Levi's), 32" = size 14. In vanity-sized brands (Banana Republic, J.Crew), 32" = size 12.
European equivalent: 32" waist = EU 42–44.
If you're between, choose based on rise: high-rise tends to fit smaller (size up), low-rise fits looser (true to size).
Always cross-reference with the brand's own size chart published on the product page.