The Most Expensive Mistake in a Hair Order Is Specifying Length Without Weight
A buyer asks for 22 inch bundles. The supplier quotes 100g. Both numbers appear on the invoice, the shipment arrives, and three weeks later the salon reports that the hair looks thin at the ends. Nobody did anything wrong on paper. The problem is that length and weight are not independent specifications, and treating them as separate is the most common reason a bundle disappoints on arrival.
This guide covers what each length looks like in practice, how many grams a real installation consumes at each length, and why the same 100g bundle means different things at 14 inches and at 26 inches.
If you are still choosing between construction types, read this alongside machine weft vs hand tied weft, because weft construction changes how much hair a given weight actually delivers.
Why Length and Weight Must Be Specified Together
Hair thins as it grows. A strand at 26 inches has been growing for over two years and its diameter tapers along that length. To make a 26 inch bundle look as full as a 14 inch bundle, you need more strands, which means more weight.
The industry convention of selling every length at 100g hides this. A 100g bundle at 14 inches is dense and generous. The same 100g at 26 inches is sparse at the ends, because the weight is spread over nearly twice the length.
Two consequences follow. First, longer lengths need higher gram weights to achieve comparable fullness. Second, a supplier quoting the same price per bundle across all lengths is either using a different weight for long lengths or accepting thinner results at the top of the range.
What Each Length Looks Like on a Client
| Length | Falls to | Typical client |
|---|---|---|
| 12–14" | Collarbone to shoulder | First-time extension wearer |
| 16–18" | Shoulder to armpit | Most retail demand, volume seller |
| 20–22" | Mid-back | Salon standard, highest margin |
| 24–26" | Lower back | Event and bridal work |
| 28–32" | Waist and below | Editorial, niche premium |
Length is measured from the top of the weft, not from where the hair emerges from the client's scalp. Allow roughly two inches of loss at the root attachment, so an 18 inch bundle sits like 16 inch hair on the client. Suppliers who measure from mid-bundle are effectively selling you two inches less than you think.
How Many Grams a Real Installation Consumes
| Length | Full head (fine hair) | Full head (thick hair) | Volume / halo |
|---|---|---|---|
| 14" | 100–120g | 140–160g | 60–80g |
| 18" | 120–150g | 180–200g | 80–100g |
| 22" | 160–200g | 220–260g | 100–120g |
| 26" | 200–250g | 280–320g | 120–150g |
| 30" | 250–300g | 330–380g | 150–180g |
These are working figures from salon installations, not marketing claims. Use them when a client asks how many bundles she needs, and use them when you plan stock: a salon doing two 22 inch full heads a week needs roughly 400g of 22 inch per week, which is four bundles.
The 100g Illusion
Because 100g is the default bundle weight, buyers assume it is a constant unit of value. It is not. What matters is grams per inch of length, and that number falls sharply as length increases.
- 100g at 14 inches: about 7.1g per inch of length
- 100g at 20 inches: about 5.0g per inch
- 100g at 26 inches: about 3.8g per inch
By 26 inches you have nearly half the density per inch that you had at 14. This is why long lengths are frequently sold in 120g or 150g bundles, and why a supplier offering 26 inch at 100g and the same price as 14 inch is selling you a thinner product, not a bargain.
Combined with draw ratio, this explains most "the hair looked thinner than expected" complaints. A double drawn 100g 26 inch bundle and a single drawn 100g 26 inch bundle differ in how much of that weight actually reaches the ends. Our guide to hair grades covers the measurement.
Lesson From a Reorder
A UK distributor originally ordered 18 inch single drawn at 100g, sold it into salons, and reordered the same specification at 24 inch. The 24 inch bundles arrived at the same weight and price per bundle, and within a month two salons complained the hair was thin at the ends.
Nothing had been substituted. The same 100g simply could not deliver comparable density over 33% more length. The fix was a 140g bundle at 24 inch, which raised the unit price by 38% and ended the complaints. The lesson is not about supplier honesty; it is that weight per length is the specification that predicts satisfaction, and it has to be written explicitly.
For volume weft orders we quote weight per length rather than a flat bundle weight, so this comparison is explicit before ordering. See our hair extensions range for how each length is specified.
Ordering Chart for Wholesale
Fill this in for each product before you send an enquiry. It takes ten minutes and prevents the most common reorder problem.
- Length, measured from top of weft: ______ inches
- Weight per bundle: ______ g
- Number of bundles per client installation: ______
- Draw: single or double, and percentage at nominal length: ______
- Cuticle: aligned remy or acid processed: ______
- Weft: machine sewn or hand tied, seam thickness: ______
- Expected reorder cycle per salon: ______ weeks
Send us this chart and we will quote against it rather than against a bundle price. Contact us with your length and weight targets and we will tell you which of our clip-in or micro loop specifications fits without changing your retail price point.