The most expensive mistake a stylist makes on an extension order is pack count. One pack short and you abort the install — or worse, finish it with stretched coverage and your client comes back at week two unhappy. One pack over and your margin disappears.
Stop guessing. There's a pack calculator at almahairextensions.com/pages/package-calculator. Use it. Here's how to think about the numbers behind it.
What The Calculator Asks You.
Four questions. Sixty seconds total:
- Install method. Veiled bead, Classic bead, or InvisiTape (tape-in).
- Natural density. Fine, medium, or thick.
- Length goal. 18", 20", or 22".
- Coverage goal. Subtle volume, volume + length, or extra density.
It returns the exact number of packs to order, with the right product line (EverWeft Single, EverWeft Double, or InvisiTape) preselected.
The Math Behind Each Method.
EverWeft Double + Veiled bead method. Higher density per row, fewer rows.
- Volume only: 1 pack = 1 row Veiled
- Volume + length: 2 packs = 2 rows Veiled
- Extra density: 2.5–3.5 packs (for thick natural hair seeking dramatic density)
EverWeft Single + Classic bead method. Lighter density per row, more rows.
- Volume only: 1–2 packs
- Volume + length: 4–6 packs
- Extra volume: 6.5–8.5 packs
InvisiTape (tape-in). Sandwich method, sized to standard sections.
- Volume only: 1 pack
- Volume + length: 2 packs
- Extra volume: 2.5–3.5 packs
Why Single Needs So Many More Packs Than Double.
The difference is per-pack weight, not quality.
- EverWeft Single: 50–70g per pack depending on length
- EverWeft Double: 115–130g per pack depending on length
One pack of Double = roughly two packs of Single in pure weight. So a Veiled install needs half the pack count of an equivalent Classic install. Both deliver the same finished density on the head — just distributed across different row counts.
This matters at order time. Don't compare price-per-pack across the two lines and conclude one is cheaper. Compare total cost per install for the client's actual install method.
Length Adjustments.
Longer lengths need more packs at the same density goal because each pack covers a smaller portion of the install map.
- 18" install: use the base pack count.
- 20" install: add 0.5 packs to the base count.
- 22" install: add 1 full pack to the base count.
Example: a medium-density client wanting volume + length at 22" with EverWeft Double: 2 packs base + 1 length adjustment = 3 packs of EverWeft Double 22".
Density Adjustments.
If your client has thick natural density and wants visible transformation, add packs:
- Standard medium → standard pack count above
- Thick + extra volume → +0.5 to +1.5 packs
- Extreme transformation (full Hollywood look) → +1.5 to +2 packs
Don't go above 3.5 packs of EverWeft Double on a single head. At that point, weight distribution becomes the limiting factor — switch to mixing Double + Single or going to four rows of Single instead.
The Reorder Rhythm.
If you stock for one client at a time, you'll always run out. Build standing inventory based on monthly install volume:
- 2-4 installs/month: stock 2-4 packs of your most-used color in each line
- 5-8 installs/month: stock 6-10 packs across your top 3 colors
- 10+ installs/month: stock 15+ packs, set up auto-reorder for hero colors at 3-pack threshold
Set the reorder threshold by your worst case: never let any single hero-color SKU fall below the pack count needed for your next booked install.
Common Pack Math Mistakes.
- Counting rows instead of packs. Two rows of Veiled isn't one pack of Double — it's two packs. Each row consumes its own pack.
- Underestimating fine-hair clients. Fine clients need more rows of Single. The pack count goes up not down.
- Forgetting length adjustment. A 22" install at "volume + length" with Double isn't 2 packs — it's 3.
- Buying short to save. If you order one pack short and the install fails or stretches, the cost of fixing it (apologies, free maintenance, lost reorder) is 10x the cost of the missing pack.
Where To Use The Calculator.
Bookmark the calculator. Use it at consultation in front of the client. Show her the numbers — it builds trust and removes guesswork from your quote.
Order at Alma EverWeft collection or InvisiTape collection once the calculator returns your count. Both gated to ALMAPRO. Apply for ALMAPRO access if you haven't yet.
Need a second opinion before ordering? Book a 15-minute concierge call — we'll review your client's photos and confirm the count before you click order.
Will Wyatt is a licensed cosmetologist and the founder of Alma Hair Extensions.
Read These Next.
- EverWeft Single vs. Double
- How To Price Hair Extension Installs
- Veiled Bead vs. Classic Bead Extensions
More install protocols, sourcing intel, and pricing math at the Stylist Resource Hub.