A full head of weft hair extensions typically takes 150 to 200 grams of hair, according to general stylist guidance. Your bundle count is that target divided by the gram weight of each bundle, so two bundles of 100 to 120 grams usually cover it. Lighter bundles mean more bundles, so confirm the weight before you order.
A bundle count you borrow from a friend, a salon chair conversation or a video only works if your bundles weigh the same as theirs, and very often they do not. One brand’s bundle can be noticeably heavier or lighter than another’s, which is why two people can both say “I used two bundles” and still end up with very different amounts of hair on their heads. The reliable way to plan a full head is to think in grams first and to count bundles second.
Weft hair extensions are one of the methods grouped under artificial hair integrations, and for a full head the amount you need is measured by weight rather than by the number of pieces in the box. At Belacio, we work with Vietnamese single-donor extensions that are cuticle-aligned. Our business is based in San Juan, Puerto Rico, and from here we help wearers across the island plan the amount of hair that fits their goal.
In this guide, you’ll learn how many grams a full head of weft usually takes, how to turn that number into a bundle count with simple arithmetic, why the drawn type of your weft and the length and thickness of your own hair change the total, and what to check on a label before you choose your bundles.
How Many Grams Does a Full Head of Weft Usually Take?
A full head of weft usually takes 150 to 200 grams of hair when the goal is added length and volume, and that range comes from general stylist guidance rather than from a fixed industry standard. Treat it as a starting point that you adjust to your own hair, not as a rule that every head must follow.
In this guide we read “a full head” as a whole-head install meant to add length and volume, because that is what most people picture when they ask the question. A few pieces of color placed through your own hair is a different job, and it calls for far less weft. Your goal for the finished look is the first thing that moves the number, so it helps to name it clearly before you start counting.
| Your goal | Typical total weight | How the guidance describes it |
|---|---|---|
| A color accent only | About 100 grams | Enough for a few pieces of color, not for a full head |
| A few extra inches on normal-thickness hair | About 150 grams | Suggested for a few inches of added length |
| Lots of length and volume | About 200 grams | Suggested for lots of length and volume |
General stylist guidance, not a rule. Your own hair and your weft type can move these figures up or down.
The table shows why the question has no single answer that fits everyone. Someone who wants a few inches on hair of normal thickness and someone who wants dramatic length and fullness are both asking about “a full head,” yet the typical amounts for those two goals sit about 50 grams apart. Once you know which row describes your goal, you have a target weight in grams, and that target is what you will divide by your bundle weight in the next step.
Turning Your Target Grams Into a Bundle Count
Your bundle count is your target weight in grams divided by the gram weight of one bundle, rounded up to the next whole bundle. That one line of arithmetic is the whole method, and it works with any brand as long as you know the true weight of each bundle you are choosing.
The catch is that brands do not all sell the same bundle size, so you always need to check the weight listed for the bundles in front of you. As one example from general guidance, a brand that sells 120 gram bundles notes that two of its bundles, 240 grams in total, are more than enough for a full head. Another brand’s bundle can weigh less, and then the same full head takes more bundles to reach the same weight.
| Weight of one bundle (example) | Bundles to reach 150 grams | Bundles to reach 200 grams |
|---|---|---|
| 50 grams | 3 | 4 |
| 75 grams | 2 | 3 |
| 100 grams | 2 | 2 |
| 120 grams | 2 | 2 |
Arithmetic examples only, not Belacio bundle weights. Each count is the target divided by the bundle weight, rounded up.
Rounding up matters because rounding down would leave you below your target range. With 100 gram bundles and a 150 gram target, for example, the arithmetic gives one and a half bundles, and one bundle alone would only reach 100 grams, which the guidance above places at a color accent. Two bundles take you to 200 grams, which still sits inside the full-head range.
Before you run the numbers, make sure you are reading the weight of one bundle and not the weight of a full pack or set. If the weight is missing or unclear, ask the seller for it, because every count in this guide depends on that single figure.
Why Single-Drawn and Double-Drawn Wefts Change the Number
The drawn type of your weft can change how many grams you need, because general guidance suggests about 150 grams of double-drawn weft when adding length, while single-drawn weft, which has thinner ends, may need about 200 grams. In plain terms, the same target look can call for a different total weight depending on how the weft was made.
| Weft type | What the guidance says | Typical total for added length |
|---|---|---|
| Double-drawn | The amount suggested when adding length | About 150 grams |
| Single-drawn | Thinner ends, so more hair may be needed | About 200 grams |
General stylist guidance, not a rule. Confirm your own weft type before you count bundles.
This is why two people with the same goal can end up with different bundle counts even when their bundles weigh the same. If one person chooses single-drawn weft and the other chooses double-drawn weft, the guidance points the single-drawn wearer toward the higher end of the range to make up for the thinner ends.
At Belacio, our double-drawn weft collection includes double-drawn and super double-drawn lines, along with virgin and raw options. The general guidance above does not give a separate gram figure for super double-drawn weft, so we would rather confirm the amount with you directly than guess at a number. Tell us which line you are considering, and we can work through the count with you before you order.
How Short or Very Thick Hair Shifts the Total
Short hair and very thick hair can both push the total higher, and general guidance suggests short hair adding up to 4 inches may need about 200 grams, while extremely thick short hair adding 3 to 4 inches or more may need up to about 230 grams. Your own hair is the second big variable after your goal, so it deserves its own look before you settle on a number.
Length comes first. The same guidance says short hair needs at least 5 to 6 inches of its own length before wefts are added, so if your hair is shorter than that, talk to a stylist about timing before you plan any bundle count. Once your hair meets that length, the amount of length you want to add and the thickness of your own hair decide where you land in the range.
| Your own hair | Length you want to add | Typical total weight |
|---|---|---|
| Normal thickness | A few inches | About 150 grams |
| Short hair, at least 5 to 6 inches long | Up to 4 inches | About 200 grams |
| Extremely thick short hair | 3 to 4 inches or more | Up to about 230 grams |
General stylist guidance, not a rule. A stylist who sees your hair in person can adjust these figures.
Fine hair runs in the other direction. The same guidance describes wefts as suited to medium to thick hair and notes that a heavy weft on thin hair can cause too much tension, so if your hair is fine, a stylist’s opinion matters more than any gram chart.
What to Check on the Label Before You Count Bundles
The five things to check before you count bundles are the weight of one bundle, the drawn type, the length, your goal for the finished look and the length and thickness of your own hair. With those five details written down, the arithmetic takes a minute and the answer fits your head rather than someone else’s.
- The weight of one bundle. Find the gram weight of a single bundle, not of a pack or set. This is the number you divide by, so every other step depends on it.
- The drawn type. Note whether the weft is single-drawn or double-drawn. Guidance suggests single-drawn weft, with its thinner ends, may need more grams for the same goal.
- The length of the weft. Write down the length you are choosing, so the length you want to add matches the hair in your bundles.
- Your goal. Decide whether you want a color accent, a few extra inches or lots of length and volume, since the typical totals for those goals are about 100, 150 and 200 grams.
- Your own hair. Check that your hair has at least 5 to 6 inches of length and be honest about its thickness, because short, very thick or fine hair can each shift the plan.
Once you have these details, divide your target grams by the weight of one bundle and round up. If any detail is missing, or if your result lands between two counts, you can contact Belacio to confirm how many bundles you need before you choose. A short message with your goal, your hair length and the line you like is enough for us to start.
Planning a Full Head With Belacio Weft Extensions
Belacio weft extensions are Vietnamese single-donor, cuticle-aligned human hair, offered in double-drawn and super double-drawn lines and in virgin and raw options, and we plan full-head amounts with you from our base in San Juan, Puerto Rico. The hair and the business have two separate origins: the hair itself comes from Vietnam, while Puerto Rico is where Belacio operates and ships from.
Our sourcing is factory-direct. We have visited more than 25 Vietnamese suppliers, and we work without middlemen, so the hair goes from the factory to you without extra hands in between. You can ask us about the bundles in the line you like, including their weight, before you choose.
Climate is part of the picture for anyone wearing extensions on the island. According to Belacio, its hair performs in 75 to 85 percent humidity and resists salt air and UV, whether you spend your days in Old San Juan or your weekends on the coast. The gram figures in this guide come from your goal, your weft type and your own hair rather than from the weather, so climate is a separate question from your bundle count.
When your bundles are ready, we send them across the island. Delivery in the San Juan metro area is same day or next day, and outer towns typically receive orders in 2 to 3 business days. You can read the full details on shipping across Puerto Rico before you place your order.
Key Takeaways
- Think in grams before bundles. A full head of weft typically takes 150 to 200 grams, according to general stylist guidance. The number of bundles only means something once you know how much each bundle weighs.
- Use one line of arithmetic. Divide your target grams by the weight of one bundle and round up to the next whole bundle. Rounding down can leave you below the full-head range.
- Brands sell different bundle weights. One example brand sells 120 gram bundles, where two bundles reach 240 grams, which that guidance calls more than enough. Always check the weight of the bundles you are actually choosing.
- Your goal sets the target. About 100 grams typically suits a color accent, about 150 grams a few extra inches and about 200 grams lots of length and volume. Name your goal before you count.
- Drawn type and your own hair shift the total. Single-drawn weft may need about 200 grams where double-drawn weft may need about 150 grams. Short or extremely thick hair can need up to about 230 grams.
- Confirm before you order. These figures are general guidance, not rules. Belacio can confirm the bundle weight and the count for the line you like before you choose.
Frequently Asked Questions
Is one 100 gram bundle enough for a full head?
Usually not. General stylist guidance places about 100 grams at a color accent only, while a full head typically takes 150 to 200 grams. With 100 gram bundles, two bundles usually cover a full head.
Is 240 grams of weft too much hair?
Not necessarily. One brand that sells 120 gram bundles says two of them, 240 grams in total, are more than enough for a full head. It sits above the typical 150 to 200 gram range, so ask a stylist whether your goal needs it.
Do all weft brands use the same bundle weight?
No. Brands sell bundles in different sizes, so the same count can add up to very different totals. Check the gram weight of one bundle from the brand you are choosing before you divide.
Where do I find the weight of one weft bundle?
Look for the gram weight listed for a single bundle, not for a full pack or set. If it is missing or unclear, ask the seller. At Belacio, we can confirm the bundle weight for any line before you order.
Should I round up or down when my count lands between two bundles?
Round up. Rounding down can leave you below your target range. For example, a 150 gram target with 100 gram bundles gives one and a half bundles, and two bundles keep you inside the typical full-head range.
How long does my own hair need to be before adding weft?
General guidance says short hair needs at least 5 to 6 inches of its own length before wefts are added. If your hair is shorter, talk to a stylist about timing before you plan a bundle count.
Can I add just a few inches without using 200 grams?
Often, yes. General stylist guidance suggests about 150 grams for a few extra inches on normal-thickness hair. Higher totals are typically suggested for lots of length and volume, for single-drawn weft or for short, very thick hair.
Should I see a stylist before choosing my bundles?
It helps. The gram figures in this guide are general guidance, not rules, and a stylist who sees your hair in person can judge its thickness and length. That opinion matters most if your hair is fine, short or very thick.
Does Belacio weft hold up in Puerto Rico humidity?
According to Belacio, its hair performs in 75 to 85 percent humidity and resists salt air and UV. The gram figures in this guide are based on your goal, weft type and own hair, not on climate.
How can Belacio help me with my bundle count?
Send us your goal, your hair length and thickness, and the weft line you like. We can confirm the bundle weight and work through the count with you. You can also call Belacio at 787-671-7122.
Conclusion
The honest answer to how many weft bundles a full head needs starts with grams: typically 150 to 200, according to general stylist guidance, with your goal, your weft’s drawn type and your own hair moving you within that range or a little past it. Divide that target by the weight of one bundle, round up, and you have a count that fits your head instead of someone else’s.
If you are planning a full head in Puerto Rico and want a second pair of eyes on the math, Belacio is here to help. Message us with your goal and the line you like, and we will help you confirm the bundle weight and the count before you choose your weft.
Call Belacio at 787-671-7122.
Ask us to confirm your weft bundle count.
