Haircut Schedule Calculator

Haircut schedule calculation helps you plan maintenance visits based on your hair type, desired length, and how fast your hair grows.

The core formula:

Weeks Between Cuts = (Max Comfortable Length − Freshly Cut Length) / Weekly Growth Rate

Annual Cost = (52 / Weeks Between Cuts) × Cost Per Visit

The trim itself does not appear in that first line, and that catches people out. A maintenance cut takes you from your maximum length back to your fresh length, so the amount removed is already the gap between the two numbers you entered. Adding it again would count the same hair twice.

What each variable means:

• Weekly growth rate: human hair grows about 0.4 mm a day, which is half an inch a month, or 0.115 inches a week. It varies with age, genetics and season, and it slows noticeably after about fifty.
• Freshly cut length: how short you go, in inches. The length you like on the day you walk out.
• Max comfortable length: the length at which it starts to annoy you and you book again.

Worked example: A short cut you like at half an inch and can live with up to an inch and a half. Average growth, half an inch a month, which is 0.115 inches a week.

Weeks between cuts = (1.5 − 0.5) / 0.115 = 8.7 weeks, so roughly every 9 weeks

At $45 a visit that is 52 ÷ 8.7 = 6 visits a year, or about $270 a year. Booking at ten weeks instead drops it to 5.2 visits and about $234, a saving of roughly $36. That is the whole argument for growing out a slightly longer style if you are trying to cut the barber bill.

Typical schedules by hair goal:

• Short men’s cut (tight fade): every 2–4 weeks
• Medium men’s cut: every 4–6 weeks
• Women’s short/pixie: every 4–6 weeks
• Women’s shoulder-length: every 8–12 weeks
• Long hair, trims only: every 12–16 weeks
• Growing out: trim every 16 weeks to remove split ends without losing length

Curly hair shrinks a lot as it dries, by 20 to 50%.
Factor that in when you judge length in the mirror, because the hair you actually grew is well past what you can see.