Carry-on bag dimensions

[JasinSwift]

I'm planning a multi-country trip with three different airlines, and each one seems to have different cabin baggage size and weight limits. Is there an easy way to check whether the same carry-on bag will meet the requirements for every flight in my itinerary without comparing each airline's rules manually? It would also be helpful to know which airline has the strictest allowance and whether there's a way to estimate potential checked baggage fees in case my bag doesn't qualify.