Lash Fill Pricing: 2-Week, 3-Week, 4-Week Math

The 3-week fill is the highest revenue-per-minute service in most lash studios — but only when priced correctly. A 2-week fill at $80 and a 3-week fill at $95 implies similar hourly rates. A 2-week fill at $85 and a 3-week fill at $115 rewards clients for the 3-week commitment and properly compensates for the longer appointment time. The 15-minute labor difference changes everything when multiplied across a full book.

What Is Per-Minute Labor Math and Why Does It Matter?

Per-minute labor math converts your fill pricing into a rate that's comparable across appointment lengths. It exposes whether you're earning more per chair-hour on shorter fills (faster but lower-priced) or longer fills (higher-priced but more time-intensive).

The formula:

Revenue per minute = fill price / fill appointment duration

A 2-week fill at $85 for 40 minutes = $2.13/minute. A 3-week fill at $115 for 60 minutes = $1.92/minute. A 3-week fill at $125 for 60 minutes = $2.08/minute. A 4-week fill at $145 for 80 minutes = $1.81/minute.

Most studios, when they run this math, discover their 4-week fills are their least efficient service. The longer appointment time is not compensated by the higher price. The fix is either raising 4-week fill pricing closer to full set rates, or enforcing the window policy so 4-week fills become full set appointments.

What Should Each Fill Interval Cost?

The Fill Interval Pricing Model builds each price point from the full set rate as an anchor, then prices fills as a percentage of that anchor based on expected appointment time.

The table shows something important: full sets often have the lowest revenue-per-minute of any service. That's normal — they're the acquisition product. Fills are the retention product, and they should be priced to reward prompt, consistent clients while compensating you properly for the appointment time.

For the full pricing model including service menu structure, see the lash service pricing guide and the build a $500K lash studio playbook.

Why Is 3-Week the Revenue Sweet Spot?

Three factors converge at the 3-week interval to make it the most efficient fill schedule for most studios.

Retention math. At 3 weeks, natural lash shedding and wear leave enough lashes to execute a proper fill (typically 40–60% retention). At 2 weeks, clients often arrive with 70%+ retention — meaning the fill appointment requires minimal lash work and could be shorter than scheduled. At 4 weeks, retention drops below 30% in many clients, approaching full set territory.

Appointment efficiency. A 3-week fill at 60 minutes fits cleanly into a scheduling block. Two-week fills at 35 minutes create awkward scheduling gaps. Sixty-minute blocks are easier to fill with back-to-back appointments and minimize chair idle time.

Annual revenue per client. A client on a 3-week schedule books 17 fills per year. At $115/fill, that's $1,955 annually. A 2-week client books 26 fills at $85 each — $2,210. The 2-week client generates more revenue, but requires 52% more of your time (26 vs 17 appointments). Per-minute efficiency still favors the properly priced 3-week client in most studios.

How Do You Enforce Fill Window Policies?

The policy is only as strong as its enforcement. Three structures that work:

At booking. Display fill interval options explicitly: "2-week fill (up to 21 days since last appointment), 3-week fill (22–28 days)." Clients self-select the correct service. Confirmation email restates the window.

At check-in. Artist visually assesses retention and confirms the service. If the client booked a 2-week fill but arrived at day 24, the artist converts the service to a 3-week fill rate at check-in — not at checkout.

For beyond-window arrivals. If a client arrives outside their booked fill window, charge the appropriate interval rate. Do not absorb the difference to avoid the conversation. One awkward conversation is less expensive than training every client that your policy is negotiable.

What Pricing Changes Actually Increase Fill Revenue?

Three adjustments with the most direct impact:

1. Raise 3-week fill prices to $110–$125 if you're currently below $100. The demand impact is minimal — regular fill clients are already committed to the cadence.
2. Price 4-week fills at 75%+ of your full set, or eliminate them and redirect to full set pricing.
3. Add a clearly stated outside-window fee ($25–$35) to your menu and appointment confirmation. This reduces beyond-window arrivals and funds the extra work when they happen.

For client retention strategy that keeps the rebooking cadence consistent, read the lash client retention guide and the lash membership pricing guide.

How Many Fill Appointments Can One Artist Handle Per Day?

Appointment capacity depends on fill interval mix and individual artist pace. A rough benchmark:

• Artist working 8-hour days (excluding breaks): 6–8 total appointments
• If 60% are 3-week fills (60 min): 4–5 fill appointments
• If 30% are 2-week fills (40 min): 2 additional fills
• If 10% are new full sets (90–110 min): 1 per day maximum alongside fills

Build schedules around realistic appointment durations, not theoretical maximums. Overloaded artists produce lower-quality work, increase retention loss rates (which depresses fill pricing further), and burn out faster.