Based on my observations, reasonable rough numbers for a fully Mustachian family (i.e. not just starting out with a bunch of baggage spending) in a reasonable COL area (i.e. not NYC, etc.), I'd think, would be 20-30k for an individual, or for a family about 10-13k/adult, and 5-7k for the first kid, and 3-5k for each subsequent kid. That would be towards the "good job, you're probably quite optimized" scale. Increase as necessary for higher COL, or previous spending baggage, or down if they're in a low COL area, or have have spending help, such as a paid off house, or are just extra badass.