Soulver does it (Mac/iPhone), it just uses 'as' instead of '->' E.g. "6Mbit/s * 1.5h as GB" I've been using it for a while now and I can't imagine going back

Soulver does it (Mac/iPhone), it just uses 'as' instead of '->' E.g. "6Mbit/s * 1.5h as GB" I've been using it for a while now and I can't imagine going back to a traditional calculator