Microlink Hair Extension Calculator
Tell us your current hair length, your goal length, and your hair density, and this calculator tells you exactly how many microlink beads you need and how many grams of extension hair to buy.
What is your primary goal for this install?
Microlinks serve three genuinely different purposes: adding inches of length, adding fullness without changing length, or both. Your answer shapes every number that follows.
How long is your natural hair right now?
Measure from the nape of your neck to the longest point your hair reaches. Microlinks can only be placed on hair that is at least 3.5 inches long so the bead has enough hair to grip.
What length do you want to reach?
The number of extension strands needed scales quickly with the added inches. Going from 10 to 16 inches typically requires 100 to 150 strands; going from 10 to 22 inches often needs 150 to 200 strands for a natural blend.
How would you describe your natural hair density?
Hair density is how many individual hairs grow per square centimeter of scalp, not the thickness of each strand. A person with fine strands can still have high density and vice versa. Most adults fall into medium.
What is the texture of your natural hair?
Texture affects how much extension weight blends invisibly. Coarser, wavier, or curlier textures can carry more grams per strand without looking heavy at the bead. Straighter fine hair needs lighter individual strands to avoid slippage and visible bonds.
What Microlink Extensions Actually Are (and Why the Count Matters)
Microlink hair extensions, also called I-tip or microring extensions, attach individual pre-tipped strands of extension hair to small sections of your natural hair using a tiny metal ring or silicone-lined bead. A tool is used to clamp the bead closed so it grips the natural hair and the extension strand together. No heat, no glue, no chemical bond. The attachment is fully mechanical.
That method is exactly why the strand count calculation matters more than it does with sewn-in or tape extensions. With a weft, you buy a bundle and cut it to size. With microlinks, every single strand is an individual purchase decision and an individual application time. A stylist charges per strand, and a typical install ranges from about 90 minutes for 100 strands to over three hours for 200 strands. Ordering the right amount the first time means your stylist does not have to pause mid-install while you order a second batch, and it means you are not paying for 50 extra strands that sit in a drawer.
The two numbers that drive every microlink order are strand count and gram weight. They are related but not identical. A strand count tells you how many individual beads your stylist places. Gram weight tells you how much extension hair those strands contain. Fine-textured extensions use thinner strands (around 0.7 grams each), coarser extensions use heavier strands (closer to 1 gram each), and the math compounds: 150 strands at 0.7 g is 105 g of hair, while 150 strands at 1.0 g is 150 g. The difference is a full pack of hair and potentially $60 to $90 at retail.
Strand Count Reference by Goal, Density, and Added Length
These ranges reflect the working estimates used in the calculator, derived from standard microlink install guides and stylist community consensus. Use them to double-check your results or to plan before you measure.
| Goal | Fine Density | Medium Density | Thick Density |
|---|---|---|---|
| Length only (up to 4 in added) | 90 to 110 | 120 to 145 | 145 to 175 |
| Length only (5 to 8 in added) | 100 to 125 | 135 to 160 | 165 to 195 |
| Length only (9 to 12 in added) | 115 to 140 | 155 to 180 | 185 to 215 |
| Volume only (no length added) | 65 to 85 | 90 to 110 | 110 to 140 |
| Both length and volume (5 to 8 in added) | 110 to 140 | 140 to 175 | 175 to 220 |
The ranges account for head circumference variation. A head circumference of 21 inches sits at the lower end of the range; 23 inches or larger pushes to the higher end. If your stylist tells you they need more or fewer strands than the calculator suggests, trust their measurement of your specific head over any estimate-based tool, including this one.
Gram Weight by Texture and Total Strand Count
| Hair Texture | Grams Per Strand | 100 Strands Total | 150 Strands Total | 200 Strands Total |
|---|---|---|---|---|
| Straight (Type 1) | 0.7 g | 70 g | 105 g | 140 g |
| Wavy (Type 2) | 0.8 g | 80 g | 120 g | 160 g |
| Curly (Type 3) | 0.9 g | 90 g | 135 g | 180 g |
| Coily / Kinky (Type 4) | 1.0 g | 100 g | 150 g | 200 g |
These per-strand weights assume standard pre-tipped I-tip strands, which are pre-packaged in 25-strand bundles by most reputable suppliers. The gram weight per strand is set at the factory; you cannot adjust it after purchase. This is why texture is one of the inputs rather than an afterthought: it directly determines how many grams of hair you actually need to order.
The Four Extension Types Side by Side
Microlinks compete directly with three other extension methods. Understanding where they fit helps you confirm that microlinks are the right choice before committing to a full install. You can also explore alternatives like tape-in extension calculator insights if you are weighing different semi-permanent placement options.
Microlink / I-Tip
Individual strands clamped with metal or silicone beads. No heat, no glue. Moved up as your natural hair grows. Best for fine to medium natural hair that cannot tolerate chemical or heat bonds.
Keratin / Fusion (U-Tip)
Individual strands bonded with a keratin glue tip melted by a fusion tool. Very natural look and movement. Removal requires heat and a bond remover, which can stress fine hair over repeated installs.
Tape-In Extensions
Flat weft panels applied in sandwiched pairs with double-sided adhesive. Fast to apply, flat against the scalp, lower per-installation cost. Reapplication every 6 to 8 weeks is not optional; grown-out tape panels pull and tangle.
Sew-In Weft (Beaded Weft)
A continuous weft threaded onto a horizontal bead track and secured with thread. Beaded weft is the closest cousin to microlinks because it also uses beads and no heat. Best for thick natural hair that can support the weight of a full weft.
Shopping for I-tip extension hair to bring to your stylist appointment? Pre-bonded human hair I-tip strands are the standard microlink supply most certified stylists work with.
Shop on AmazonPre-Bonded I-Tip Human Hair Extensions →As an Amazon Associate we earn from qualifying purchases.
Special Situations a Stylist Sees Regularly
Very fine or color-treated natural hair
Fine hair that has also been highlighted or color-processed is more fragile at the attachment point. Use silicone-lined beads rather than plain metal rings. Silicone cushions the grip and reduces the point of friction where breakage most commonly starts. Order at the lower end of the strand count range and confirm the result after the first install rather than going straight to 150 strands.
Natural hair shorter than 5 inches
The standard minimum for a microlink install is about 3.5 inches at the nape. At that length, there is barely enough hair to thread through the bead and clamp securely. Stylists often recommend waiting until the natural hair reaches 5 to 6 inches for a more stable hold. If your measurement came out below 5 inches, discuss timing with your stylist before purchasing hair.
Adding length beyond 12 inches
Going from, say, a chin-length bob to waist-length hair in one install is technically possible but puts real tension on the scalp over the following weeks. Most experienced stylists recommend adding no more than 8 to 10 inches in a single install and building from there. The strand count multiplier in the calculator at 12-plus added inches reflects this higher demand, but the physical limit of what your natural hair can comfortably anchor is a conversation to have with your stylist in person.
Clients with alopecia or thin patches
Microlinks are sometimes recommended for alopecia clients because they do not require heat or chemicals at the bond point. However, placing a bead directly over a thin or inactive patch puts mechanical stress on follicles that may already be compromised. Most trichologists recommend placing beads on surrounding healthy hair and using the extension to cover the thin area through blending, not by attaching directly to it.
Maintenance and move-up timing
Microlinks should be moved up every 6 to 10 weeks depending on how fast your natural hair grows. The standard growth rate is about half an inch per month, meaning after eight weeks the bead has migrated roughly one inch from the scalp. Waiting beyond 10 to 12 weeks creates a section of hair between the scalp and the bead that mats, tangles around the bead, and is genuinely difficult to remove without some loss of natural hair. When you budget for microlinks, factor in move-up appointments at $150 to $300 each depending on stylist and region, or use an extension maintenance calculator to map out your recurring salon expenses.
Frequently Asked Questions
How many microlink strands do I need for a full head?
A full head install for medium-density natural hair typically requires 100 to 175 strands depending on your goal. Volume-only installs on medium hair run around 90 to 110 strands. Combined length and volume installs on the same density run 140 to 175 strands. Fine hair needs somewhat fewer strands because each natural hair section is smaller; thick hair needs more because the sections are larger and you need more extensions to match the density of the natural hair they blend into.
What length of microlink extensions should I buy?
Buy extensions that match your target length, not your current length. If your natural hair is 10 inches and you want a 20-inch result, buy 20-inch I-tip strands. The extensions will blend from where the bead sits (close to the scalp on growing-out natural hair) down to the 20-inch point. Buying shorter extensions to "blend with your natural length" is one of the most common purchasing mistakes. The extension length stated on the packaging is the length from the bead tip to the end of the strand.
Can I install microlink extensions myself at home?
Technically yes, but realistically the back sections are nearly impossible to bead correctly without a second set of hands and a mirror setup most people do not have at home. The bigger practical risk is beading too close to the scalp, which causes the bead to press against the skin during movement and create pressure sores or traction alopecia over time. If you do attempt a DIY install, limit it to the front and side sections where you can see what you are doing, and confirm placement height with a second person before clamping.
How long do microlink extensions last before needing to be redone?
The extension hair itself, if it is good-quality human hair, lasts 9 to 18 months with proper care. The install itself needs a move-up appointment every 6 to 10 weeks as your natural hair grows. The distinction matters for budgeting: you pay for the hair once (or once per color change), and you pay for the stylist time repeatedly. Synthetic microlink strands last 3 to 6 months before the fiber degrades visibly and the strand needs to be replaced entirely.
What is the difference between microlinks and nano rings?
Nano rings use a much smaller bead than standard microlinks. The bead is roughly 3 mm in diameter compared to the standard 4 to 5 mm microlink bead. Nano ring strands are pre-tipped with a thin nano tip rather than a standard I-tip. The smaller attachment point is essentially invisible at the scalp and works particularly well for very fine hair where even a standard microlink bead creates a visible bump. The trade-off is that nano ring strands hold less hair per strand, so you typically need more of them to achieve the same result as a standard microlink install.
Do microlink extensions damage natural hair?
When installed and maintained correctly, microlinks have one of the lowest damage profiles of any extension method. The risk comes from three specific mistakes: beads clamped too tightly (cuts into the natural hair), beads placed too close to the scalp (causes traction), and move-up appointments delayed too long (the grown-out section mats around the bead). Installed at the right height, closed with the right pressure, and moved up on schedule, most clients see no measurable damage to their natural hair over multiple installs.
Can microlinks be used on color-treated or bleached hair?
Yes, with the caveat that chemically processed hair is more fragile at the point of bead contact. Use silicone-lined beads to cushion the grip. Avoid placing beads directly on sections that have been bleached to a very high level of lift (pale yellow or white), as those sections may have reduced tensile strength. Many stylists do a gentle pull test on a few strands before placing beads on heavily bleached hair to gauge how much mechanical stress the strand can tolerate.
How many grams of hair do I need to buy for microlinks?
The gram count depends on both your strand count and the texture you are matching. A typical medium-density, straight-hair install of 130 strands needs about 91 grams of hair. The same strand count for coily hair needs 130 grams. Extension hair is typically sold in 50 g, 100 g, 150 g, or 200 g packs. Always buy one pack more than your calculated minimum. Stylists trim and blend the ends during the install, and if they run out partway through a row you will wait a week or more for additional hair to arrive before the install can be finished.
For most microlink clients shopping independently, a 100g pack of double-drawn, Remy human hair I-tip strands in 18 to 22 inches is the most versatile starting point. Double-drawn means the strands are full from root to tip rather than tapered, which gives a more uniform blend at the ends.
Shop on AmazonDouble Drawn Remy I-Tip Microlink Extensions →As an Amazon Associate we earn from qualifying purchases.
This page contains affiliate links. As an Amazon Associate we earn from qualifying purchases at no additional cost to you. Strand count and gram weight estimates are reference figures based on industry standards and are not a substitute for a professional stylist consultation.