What’s a fair tip on a standard men’s haircut that costs $22 and lasts about 20 minutes? I’ve always tipped around $5, but my barbershop added a new electronic payment station and the screen to add a tip suggests $5, $7, $10 or other. I’ve always thought $5 was a decent tip, but now I’m worried I’ve been shortchanging the staff. There’s probably some science behind showing clients higher suggested tip amounts leading to higher actual tips.