What if you have the opposite problem? A recipe calls for sweetened condensed milk, and you’ve got evaporated milk? That’s actually easier! Just take one can of evaporated milk and stir in about ⅔ cup of white sugar until it dissolves. You will get a close approximation—though it won’t be as thick and gooey as the real deal.
If you need that gooey texture, you can simmer the evaporated milk with sugar on low heat for 15 minutes to reduce it further. Congratulations, you just made a DIY sweetened condensed milk, minus the can’s smug label.