When to use "may" or "might"?
Verbs of permission can be used for translating "may" or "might" when they are being used for seeking approval. Erichsen, Gerald. "How To Translate the Auxiliary Verbs ‘Might’ and ‘May’ to Spanish.".
Is "may as well" a translation?
There's no single translation that always works for "might as well" or the less common "may as well." Check the context to see what nuance of meaning might work best.