Identify your use: sandwiches (slicing + mild bite) or baking (need stretchy, even melt).
Choose the closest option from the table: cheddar/Colby-Jack for flavor match, Gruyère/Havarti for richer melt.
Swap at the listed ratio (use equal weight if you’re shredding or melting).
If the substitute is milder (mozzarella, muenster, Monterey Jack), add a small seasoning adjustment (salt or a tiny dash of mustard) before serving.
Taste at the end: if it’s too sharp, blend with a mild cheese; if it’s not tangy enough, blend in a little cheddar.