Half-and-half substitute
1 cup half-and-half = 3/4 cup whole milk + 1/4 cup heavy cream
Half-and-half sits between milk and cream, at roughly 10–12% fat. Mixing the two gets you there.
Substitutes for 1 cup half-and-half
Option 1
3/4 cup whole milk + 1/4 cup heavy cream
This lands close to the fat of half-and-half. Works in coffee, sauces and baking.
Option 2
1 cup whole milk + 1 tablespoon melted butter
Slightly thinner. Fine in cooking and baking.
Amounts are for a US recipe. Need to convert them? See cups to grams.
Questions
What can I use instead of half-and-half?
For 1 cup half-and-half, you can use 3/4 cup whole milk + 1/4 cup heavy cream; or 1 cup whole milk + 1 tablespoon melted butter.
What is the best substitute for half-and-half?
For most recipes, use 3/4 cup whole milk + 1/4 cup heavy cream. This lands close to the fat of half-and-half. Works in coffee, sauces and baking.