Medically reviewed by Dr Sari Nasr · Last reviewed 14 September 2026
A free graft calculator that returns a range, not a single number, because a graft count is a surgical judgement built from the Norwood stage, the area being covered, donor density and hair calibre. Any clinic that quotes one exact figure before examining your donor area is selling, not measuring.
HairX Clinics built this hair transplant graft calculator, and anyone may use it or embed it for free. It starts from the published Norwood graft ranges used in hair restoration planning, then adjusts them for the three things that move the number most: the zones you want covered, donor density and hair calibre. It does not ask for your name, email or phone, and nothing you enter is stored or sent anywhere.
Hair Transplant Graft Calculator
An evidence-based estimate of the graft range a case is likely to need. It is an estimate, not a quote — only an examination of your donor area can confirm a number.
Calculator by HairX Clinics — free to embed with attribution.
How to use the graft calculator
Work through the four steps from the top. Tick every zone you would want covered, not only the one that bothers you most today. Then pick the Norwood stage closest to your scalp (the drawing below helps). If you do not know your donor density or hair calibre, leave both on the middle setting. The range updates as you click, and the line under it turns grafts into an approximate hair count.
Use the result as a starting point for a conversation with a surgeon. Two people who enter the same answers can still be given different numbers once their donor areas have been examined.
The Norwood scale, stage by stage
The calculator’s main question is your Norwood stage, so here is the whole scale in one picture. It is a top-down view of the scalp, front of the head at the top. The solid tone is hair that is still there.
Not sure which drawing matches you? Our guide to the Norwood scale describes each stage in words, and 2,000 vs 3,000 grafts shows what the two most common results from this calculator cover on the head.
Embed this calculator on your site for free
You may embed this calculator on any website, at no cost and with no permission needed. The only condition is that the attribution link inside the tool stays visible. Copy this code into your page:
<iframe src="https://hairxai.com/graft-calculator/?hxembed=1"
title="Hair Transplant Graft Calculator by HairX Clinics"
style="width:100%;max-width:860px;height:840px;border:0"
loading="lazy"></iframe>
<p><a href="https://hairxai.com/graft-calculator/">Hair Transplant Graft Calculator</a>
by <a href="https://hairxai.com/">HairX Clinics</a></p>The embedded frame posts its height to the parent window (a window.postMessage carrying a hxGraftCalcHeight key) if you prefer to auto-size it rather than fix the height.
How the estimate is calculated
The calculator starts from the graft ranges published for each Norwood stage in hair restoration planning literature:
- Norwood 2: 800 to 1,500 grafts
- Norwood 3: 1,500 to 2,200 grafts
- Norwood 3 vertex: 2,000 to 2,800 grafts
- Norwood 4: 2,200 to 3,200 grafts
- Norwood 5: 3,000 to 4,000 grafts
- Norwood 6: 4,000 to 5,500 grafts, normally across two sessions
Each published range assumes the coverage that is typical at that stage: hairline only at Norwood 2 and 3, hairline plus mid-scalp at Norwood 3 vertex and 4, and the full scalp at Norwood 5 and 6. The calculator then compares the zones you select with that typical footprint and scales the range to match. The hairline and temples count as 40 per cent of a full scalp, the mid-scalp as 32 per cent and the crown as 38 per cent. Any increase is capped at 1.35 times the published range, so the number cannot run away.
Two more adjustments follow. A thin donor area lowers the safe yield by about 15 per cent, and a dense one raises it by about 6 per cent. Fine hair needs roughly 15 per cent more grafts to look equally full, while coarse hair needs about 12 per cent fewer. The reason is that how thick hair looks depends on the total cross-section of the hair shafts, not on the number of follicles.
The hair count shown under the graft range uses an average of 2.2 hairs per graft, which is typical of a mixed harvest of singles, doubles and triples. In clinic the estimate is built zone by zone in much the same way; our guide to how many grafts you need walks through it.
What the calculator cannot tell you
The calculator cannot see your donor area, and in almost every case that is where the real limit lies. A patient at Norwood 5 with a thin, low-density donor zone cannot safely receive 4,000 grafts, and a surgeon who agrees to take them is borrowing from the back of the head to decorate the front. It also cannot assess active loss: transplanting into an area that is still shedding produces a result that looks thinner a year later, which is why medical stabilisation usually comes before surgery.
For a figure based on your own scalp rather than a population average, HairX Clinics runs a free AI hair analysis that reads a photograph and returns a per-zone graft plan, a written surgical rationale and a twelve-month timeline.
Citing this tool
Journalists, researchers and other clinics are welcome to cite it. Suggested citation:
HairX Clinics. Hair Transplant Graft Calculator. hairxai.com, 2026. https://hairxai.com/graft-calculator/
Questions about the method, or a correction: contact HairX Clinics.