Crochet Hair Calculator
Tell the calculator what style you want and how you install it, and it figures out exactly how many packs of crochet hair you need, plus what to look for on the package label.
What crochet style are you installing?
The style determines strand thickness and how many attachment points you need per square inch of scalp. Locs and twists are bulkier per strand than box braids or loose wave.
What fiber type is the hair?
Kanekalon is the standard for most braiding styles. Marley fiber is coarser for a natural loc texture. Toyokalon is smoother and lighter, popular for wavy and curl styles.
How much scalp area are you covering?
Full head installs need 45 to 70 cornrow anchor points on average. A partial or top-only install uses 20 to 35 anchor points. A half-head (sides and back) falls in the 28 to 42 range.
How many cornrow anchor rows did you braid (or plan to braid)?
Each cornrow row typically gets 6 to 10 crochet attachment points along its length. More rows mean more attach points and more hair needed. If you have not braided yet, estimate: most full heads use 8 to 12 rows.
How full do you want the finished style to look?
Natural fullness uses roughly one strand per attach point. Medium fullness adds about 30% more hair for extra body. Extra full is the look you see in professional installs shot for social media, and it can take up to twice the hair of a natural finish.
Your crochet hair estimate
Based on your selections, here is what you need to buy before your install day.
Why Pack Count Is the Number That Actually Matters
Crochet hair is sold by the pack, not by the strand count you actually install. Packs vary by brand from as few as 12 strands to as many as 30, and the weight per pack ranges from 60 grams to over 120 grams. Two packs from different brands are not interchangeable quantities. This is why raw strand or gram estimates only get you partway there. You need to know how many strands your style requires, then divide by what your specific pack contains.
Most crochet installs fall between 50 and 110 total strands for a full head, depending on the style. Box braids in a medium size use roughly one pre-made unit per attach point, meaning a 60-attachment install needs about 60 units. A locs or twist style uses more fiber per attachment because each strand is larger in diameter. A curly bulk style may use half-strands (one pack strand folded and looped), effectively doubling what you get from each pack.
The safest approach is to buy one extra pack beyond your calculated need. If you run short mid-install and your local beauty supply is out of your dye lot, you will pay three times the cost in time and frustration versus the extra pack you returned.
Strand and Pack Reference by Style
| Style | Strands for Full Head | Typical Packs Needed | Strands per Pack (avg) | Hair Weight per Pack |
|---|---|---|---|---|
| Box Braids (medium) | 60 to 80 units | 5 to 8 | 10 to 15 pre-made | 100 to 120 g |
| Box Braids (small) | 90 to 120 units | 7 to 10 | 12 to 16 pre-made | 100 to 120 g |
| Senegalese Twists | 50 to 70 units | 5 to 7 | 10 to 14 pre-made | 80 to 110 g |
| Faux Locs | 40 to 60 units | 6 to 10 | 6 to 8 pre-made | 100 to 130 g |
| Butterfly Locs | 40 to 55 units | 7 to 12 | 4 to 6 pre-made | 100 to 130 g |
| Loose Wave / Curls (bulk) | 80 to 110 half-strands | 6 to 9 | 20 to 30 strands | 60 to 100 g |
| Cornrow Extensions (bulk) | 70 to 100 strands | 4 to 7 | 20 to 30 strands | 80 to 120 g |
Fiber Types and What They Actually Feel Like to Work With
Kanekalon
The default fiber for most braiding and twist styles. It takes hot water well for sealing, has minimal tangling out of the pack, and holds a smooth finish. The strands are relatively fine so you can double them at attachment points for extra fullness without much added weight.
Marley / Afro Kinky
This fiber has a coarse, high-crimp texture that genuinely mimics natural 4C hair. It blends almost invisibly at roots left out, which is why it is the go-to for faux locs and Marley twists on clients with kinky natural hair. It tangles more easily than Kanekalon once installed.
Toyokalon / Synthetic Bulk
Softer and finer than Kanekalon. Toyokalon produces a more natural wave pattern when looped, which is why it dominates the water wave and loose curl crochet market. It is lighter per strand, so you often need slightly more strands for the same fullness.
Human Hair Blend
Pre-made crochet units with a human hair component can be blow-dried, flat-ironed, or curled with heat tools. Packs typically contain fewer units (4 to 8 per pack) at higher prices. The extra expense is justified for clients who want to change their styling regularly after install.
Shopping for crochet hair on Amazon gives you access to multipacks, which are the most cost-effective way to stock up when you have confirmed the exact pack count you need.
Shop on Amazon Kanekalon Crochet Braiding Hair Packs →As an Amazon Associate I earn from qualifying purchases at no extra cost to you.
How Cornrow Layout Changes Your Pack Count
The cornrow pattern you braid before installing crochet hair is the single biggest variable most buyers ignore. A feed-in cornrow braided to the back on a straight part grid gives you a different number of usable crochet attachment points than a circular spiral pattern braided for a bob. Here is why it matters for your order.
A straight back cornrow grid on a full head typically produces 8 to 14 rows. Each row accepts 5 to 9 attachment points depending on row length and hair thickness. On 10 rows with 7 points each, that is 70 attachment points total. For box braids at natural fullness, you need roughly one unit per point, so 70 units. If your packs contain 14 units each, you need 5 packs with a few left over.
A spiral cornrow pattern for a bob-style crochet install may have only 6 to 8 rows but longer rows that curve around the head, giving you 55 to 65 attachment points. The count drops, and so does your pack total. Getting the cornrow count right before you shop is worth a few minutes of planning.
Attachment Points by Cornrow Count
| Cornrow Rows | Attach Points (light) | Attach Points (dense) | Coverage |
|---|---|---|---|
| 6 rows | 30 | 54 | Partial |
| 8 rows | 40 | 72 | Half to Full |
| 10 rows | 50 | 90 | Full Head |
| 12 rows | 60 | 108 | Full Head Dense |
| 14 rows | 70 | 126 | Full Head Extra Dense |
Special Situations a Stylist Sees Regularly
Very Short Natural Hair Underneath
When the client has a TWA (teeny weeny afro) or less than two inches of natural hair, cornrows sit close to the scalp and may not hold crochet attachments as firmly at the ends of each row. Shorter rows mean fewer viable attach points per row. Plan for 10 to 15 percent fewer attachments than the standard count and compensate with slightly thicker strands rather than more attachment points.
Refreshing an Existing Crochet Install
If you are replacing hair on cornrows that are still intact and fresh, you need only the replacement strands, not a full pack count. Count how many strands slipped or were removed, then add 10 percent. You rarely need more than two packs for a refresh job unless significant shedding happened in the first install.
Mixing Two Colors or Textures
When you split your install between two colors, divide your total pack count proportionally by the coverage ratio you want, then round each color up to the nearest whole pack. A 70/30 split on 7 packs means 5 packs of color A and 2 packs of color B, rounded up. Always round up on the smaller color because partial packs cannot be returned and you cannot predict exactly where the color transition will land mid-install.
High-Density Scalp Coverage for Photography or Events
Professional photo shoots and events often require 40 to 60 percent more hair than an everyday wear install. The style needs to read in a frame and hold up under studio lighting that flattens texture. For these installs, start from the extra full estimate and go up from there, using half-strands at every attachment point to maximize the appearance of density without the weight penalty of full doubled strands.
Clients with Fine or Fragile Edges
Reduce the attachment density within two inches of the hairline. Use fewer, lighter-weight strands at the perimeter rather than full-weight units. This means your hairline row uses roughly half the attachment weight of your interior rows. Adjust your total strand count down by 5 to 8 percent and note this for the install so you do not use up hairline-reserved strands in the interior.
Frequently Asked Questions
How many packs of crochet hair do I need for a full head of box braids?
For medium-size box braids on a full head, the real-world range is 5 to 8 packs depending on pack strand count and your desired fullness. Most packs for pre-made crochet box braid units contain 10 to 14 units per pack. A standard full head install uses 60 to 80 attachment points. At 14 units per pack, 5 packs gives you 70 units, which covers most full-head installs at natural to medium fullness. For small braids or extra-full installs, budget 8 to 10 packs.
How many packs of hair do I need for faux locs?
Faux locs typically use 6 to 10 packs for a full head. The pre-made loc units sold for crochet installs usually come 4 to 8 units per pack because each unit is quite large in diameter. A full head install uses 40 to 60 loc units depending on how chunky you want the locs. At 6 units per pack, 8 packs gets you 48 units, which is right in the middle of the full-head range at natural to medium fullness. Butterfly locs run a little higher at 8 to 12 packs because the wrapping technique takes more material per unit.
Can I use fewer packs if I have thick natural hair underneath?
Yes, but with limits. Thick natural hair means each cornrow braided underneath is also bulkier, which means fewer cornrow rows fit on the scalp before the overall braid pattern becomes too crowded. Fewer rows means fewer attachment points, which does reduce your strand count. However, thick natural hair also means you need the crochet extensions to blend with a larger hair circumference at the roots, so you should not thin the extensions too aggressively or the contrast at the attachment point will show. A realistic reduction for very thick natural hair is 10 to 15 percent from the standard estimate, not more.
What does the strand count on the package actually mean?
For pre-made crochet units (box braids, locs, twists), the strand count is the number of finished, ready-to-install units in the pack. For bulk hair (Kanekalon, Marley, Toyokalon sold as raw bundles), the strand count is the number of long folded strands that you will then section into your own sub-strands at installation. With bulk hair, one pack strand folds in half and can be used as-is for one attachment point, or split further for lighter attachments. Knowing which type you are buying changes how you use this calculator’s output.
How many packs of Marley hair do I need for Marley twists?
Marley twists on a full head typically take 5 to 7 packs of Marley bulk hair. Each pack has approximately 18 to 24 strands. You fold each strand and twist it around your natural hair or anchor it with the latch hook. For medium-size twists, one folded strand per attachment gives a realistic twist diameter. A 60-attachment full-head install at one strand per attachment uses 60 strands, requiring 3 packs at 20 strands each. However, most stylists double the strand at each attachment for fullness, which doubles the pack count to 6. Go with 6 to 7 packs for medium-full Marley twists on a standard full head.
Is there a way to tell how many strands are in a pack before I buy?
On pre-made unit packs, the strand count is usually on the front label. On bulk hair packs, it is often listed in grams with a fiber count that varies by brand. The safest method is to check the brand’s product listing online, which usually lists both grams and strand count in the description. If a pack only lists grams, use this rough rule: 100g Kanekalon pack has about 20 to 24 strands; 100g Marley pack has about 16 to 20 strands because the coarser fiber is heavier per strand.
What happens if I buy too few packs of crochet hair?
Running out mid-install is the worst practical outcome because you stop with uneven coverage that you cannot leave in. If your beauty supply has the same product in stock, you may get it the same day, but dye lot variation between production runs can create visible shade differences even in the same color name. Online orders take days. The cost of one extra pack is almost always lower than the cost of rescheduling or running an emergency errand. Always round up by one pack from your calculated total.
Can I return unused packs of crochet hair?
Most beauty supply stores have no-return policies on hair products once the package is opened. Unopened packs can usually be returned or exchanged within a reasonable time frame at physical stores if you have the receipt. On Amazon and similar online retailers, the return policy varies by seller but many synthetic hair packs are returnable if unopened. This is another reason to buy in whole packs: open only what you need during install, keep spares sealed for potential return or future use.
If you are doing a faux locs or butterfly locs install, these pre-made crochet loc packs are consistent in diameter and length across the pack, which makes the install go significantly faster than hand-wrapping from bulk fiber.
Shop on Amazon Pre-Made Crochet Faux Locs Packs → Shop on Amazon Marley Bulk Braiding Hair for Twists →As an Amazon Associate I earn from qualifying purchases at no extra cost to you.
This page contains affiliate links. As an Amazon Associate I earn from qualifying purchases at no additional cost to you. Pack counts on this page are based on industry installer data and typical product specifications; always verify the strand count on your specific purchased pack before finalizing your order.