Lash Tray Inventory: Calculate Reorder Points by Length and Curl

Running out of 10 mm C-curl in the middle of a full set is an absolute nightmare. On the flip side, opening a drawer full of 15 mm trays that haven’t budged in six months means your hard earned money is just sitting there collecting dust.

Managing lash inventory doesn’t have to feel like a high-level math problem. By setting a simple Reorder Point for your most-used curls and lengths, you’ll always have the lashes you need on hand without overbuying.

What is a Reorder Point?

A reorder point is simply the minimum number of trays (or strips) you should have left before it’s time to order more.

To figure this out, you only need to know three quick numbers:

1. How fast you use them (Daily usage): How many strips of a specific length and curl do you go through on an average workday?

2. How long shipping takes (Lead Time): How many business days does it usually take for an order from your lash supplier to arrive at your door?

3. Your emergency cushion (Safety Stock): A small buffer of extra lashes in case shipping is delayed or you get a sudden rush of bookings.

The Reorder Formula

Reorder Point = (Strips Used Per Day x Lead Time in Days) + Safety Buffer

Factoring in London Lash US Shipping Windows

To calculate an accurate reorder point, determine your realistic delivery window based on your US location and the shipping method you select at checkout. Remember that all US orders dispatch from our US-based warehouse, and delivery timelines begin the working day after dispatch (Monday–Friday, excluding holidays):

• Express Shipping: Delivers within 1 to 3 business days—ideal for tight turnaround times and fast-moving staples.

• Standard Shipping: Delivers within 3 to 8 business days—a cost-effective choice for planned, routine restocks.

Check the London Lash Shipping Policy for current cutoff times, live transit estimates, and free shipping minimums before setting your baseline numbers.

Reorder Point Matrix: High-Turnover vs Accent Lashes

Lash lengths deplete at uneven rates. Core working lengths (9 mm to 12 mm) in everyday curls turn over rapidly, whereas extreme inner-corner and accent lengths (7 mm, 8 mm, 14 mm, 15 mm) move at a fraction of that speed.

The table below show stock triggers for a lash artist working 5 days a week using Standard Shipping (planning for a 3- to 4-day delivery buffer):

Studio Inventory Habits

1. Count Strips, Not Boxes

A closed lash box looks full on your cart even when only three lines remain. Track physical strips during audits. Once a single-length tray drops below 4 lines, treat it as depleted and make sure its replacement is already on your shelf.

2. Schedule a Weekly Stock Audit

Conduct your stock checks on a set morning each week (like Monday before your first appointment). This lets you assess weekend consumption and submit your cart comfortably before the daily dispatch cutoff.

3. Hit the Free Shipping Minimum

Placing frequent, small orders adds avoidable shipping fees to your overhead. Consolidate weekly tray restocks alongside fast-turnaround liquids (such as adhesives, primers, and prep pads) to hit the free shipping tier.

4. Switch Fringe Sizes to Mixed Trays

Holding single-length boxes of 6 mm, 7 mm, 14 mm, or 15 mm often leaves trays sitting on shelves for months. Use London Lash Mixed Trays for these fringe sections, reserving dedicated single-length purchases for sizes 9 mm through 13 mm.

Mastering your lash inventory comes down to replacing last-minute panic with a simple, repeatable routine. By calculating your reorder points around real shipping windows and tracking strip usage by length and curl, you protect both your daily schedule and your bottom line. Take twenty minutes this week to run through your drawers, set your baseline numbers, and let your inventory work for your business, not the other way around.

Frequently Asked Questions

What are the most popular lash tray lengths and curls?

The most-used lengths across full sets are 10 mm, 11 mm, and 12 mm, primarily in C and CC curls (with D curl leading for dramatic volume). These sizes form the body and transition zones of classic, hybrid, and volume maps. Outer accents (14 mm–16 mm) and inner-corner lengths (6 mm–8 mm) have lower turnover and are best stocked as mixed trays.

How many full sets can you get out of one lash tray?

A standard single-length tray contains 12 to 16 lines (strips). A classic set uses about 2 to 3 strips total across multiple lengths, yielding 4 to 6 full sets per tray if using single lengths. For handmade volume sets using 3 to 5 strips, a tray yields 3 to 4 full sets. Because lash maps combine multiple lengths, high-demand sizes (10 mm–12 mm) deplete much faster than others.

How often should a lash artist restock inventory?

Solo lash artists typically restock every 2 to 4 weeks, while multi-artist salons restock weekly. Choosing a fixed weekly audit day (such as Monday morning) helps keep adhesives within their optimal 30-day post-opening window, avoids emergency rush shipping fees, and allows you to hit free shipping minimums.

What is a safety buffer when calculating lash inventory?

A safety buffer (or safety stock) is the reserve inventory kept on hand to protect against carrier delays, federal holidays, or unexpected appointment surges. A standard safety buffer for high-turnover lengths (10 mm–12 mm in C/CC/D) is 1 full tray, while fringe or accent sizes require only 0.5 tray (half a box or lines from a mixed tray).

What is the difference between single-length and mixed lash trays?

Single-length trays contain 12 to 16 lines of a single, identical length, making them the most cost-effective choice for everyday staple sizes (9 mm–13 mm). Mixed lash trays contain a range of lengths (typically 8 mm to 15 mm) in one box, which prevents cash from sitting idle in slow-moving accent lengths like 7 mm, 8 mm, 14 mm, and 15 mm.