You can tip a locksmith with any amount you want to give. However, if you are looking for a guide, most people tip locksmiths between 15% and 20% of the total bill. If you decide to tip a locksmith, 15-20% is a good amount. This is standard for most services.
As mentioned, there is no need to tip. The etiquette dictates that a business owner should not expect a tip. If you were an employee of a business, asking for a tip is bad etiquette. Are you supposed to tip a locksmith? And if so, how much do you tip a locksmith? Do you tip them for each and every service, or just when they show up to get out of a bind? How much do you tip a locksmith? If you choose to do so, the usual rate would be 15-20% of the total bill, which is typical for most services.
Of course, you can tip more or less depending on the quality of service, difficulty and term of work or other criteria. There is no fixed amount because locksmiths are already paid enough for their work before tips. Tipping a locksmith is usually not necessary. There are some exceptional cases where they may deserve a small token of appreciation; for example, if they provide emergency service outside working hours or during holidays.
A good way to show appreciation for the work a locksmith has done is with a 15-20% cash tip at the time of service. Usually, people tip locksmiths more generously for ordinary jobs than for emergency work; however, for me personally it makes more sense to generously tip locksmiths on the latter. Green says his locksmiths tend to get tips on non-emergency jobs (which, to be fair, can be quite expensive).