The Ludwig scale: how female hair thinning is graded

If you have been told you have "Ludwig grade I" or "grade II" hair loss, you may wonder what it means and whether it is good or bad news. The Ludwig scale is the best-known way to describe how far female pattern hair loss has progressed. Understanding it can help you follow what your doctor says and track your own hair over time.

What female pattern hair loss looks like

Female pattern hair loss is common and does not scar the scalp. It typically shows as a widening of the central parting on top of the head, while the front hairline usually stays in place ¹. This is different from the typical male pattern, where the hairline recedes and the crown thins.

In 1977, the dermatologist Erich Ludwig noted that this kind of hair loss in women was much more frequent than generally believed, and that it looked different from common baldness in men ². To help doctors recognise it early, he proposed a classification of its stages ².

The three Ludwig grades

The Ludwig scale grades visible thinning on the top of the scalp from I (least severe) to III (most severe) ¹. In everyday terms:

• Grade I: thinning on top that becomes noticeable when the hair is parted down the middle. The parting looks wider than it used to. The front hairline is preserved.
• Grade II: more obvious thinning over the top, with the scalp clearly visible through the hair in that area.
• Grade III: marked thinning across the top, so the scalp is easily seen, while hair at the sides and back remains comparatively full.

Ludwig noted that a small number of women show a male-type pattern instead, which is graded using the Hamilton scale used for men ².

How common is each grade?

One study from Thailand examined 178 women aged 50 to 65 after menopause. About half (52.2%) had female pattern hair loss. Of those, 73.2% were Ludwig grade I, 22.6% grade II and 4.3% grade III ³. In that group, having a body mass index of 25 or more was linked with higher odds of hair loss after adjusting for age and family history ³. These figures come from one group of women and should not be read as exact numbers for Malaysia, but they show that milder grades are far more common than severe ones.

A limitation: it detects thinning late

The Ludwig scale is easy to use, but it has a weakness. An expert consensus group pointed out that by the time a woman shows the full features of Ludwig grade I, she has already lost a significant volume of hair ¹. That matters because current treatments may realistically halt progression, while improvement in density is often more limited ¹. In other words, the earlier hair loss is recognised, the more hair there is to protect.

Newer tools: the FPHL Severity Index

To pick up earlier changes, nine experienced clinicians from Europe, North America and Australia developed the Female Pattern Hair Loss Severity Index (FPHL-SI) by consensus ¹. It combines:

• how much hair is being shed
• hair density along the middle parting
• findings on trichoscopy, a magnified scalp examination

The total score runs up to 20. A score of 0 to 4 makes female pattern hair loss unlikely, 5 to 9 suggests early-stage hair loss, and higher scores indicate greater severity ¹. The authors described it as a starting point that may need further refinement after validation ¹.

Your doctor may also use other descriptive scales or simply standardised photos. What matters most is consistency, using the same method each time.

What the grade does and does not tell you

A Ludwig grade describes how much thinning there is on top. It does not tell you:

• the cause. Other conditions, such as shedding after illness, thyroid problems or low iron, can coexist with or mimic pattern hair loss. Blood tests may be needed (see blood tests).
• how fast it is changing. Two women at grade I may be progressing at very different rates.
• how you will respond to treatment.

Tracking your own hair

You can support your doctor's assessment by taking photos of your parting every few months, in the same light, with the same parting line and camera distance. See photo tracking. If you are unsure whether your hair is thinning or just naturally fine, see fine hair versus thinning hair.

When to see a doctor

See a doctor if your parting is widening, your ponytail feels thinner, or you notice more scalp under bright light. Early assessment gives you the widest range of options. Treatments for female pattern hair loss are discussed in spironolactone and other guides; a doctor can advise what suits you.

Frequently asked questions

What does Ludwig grade I mean?

It means mild but visible thinning on top of the scalp, usually seen as a wider central parting, with the front hairline preserved ¹.

Is the Ludwig scale still used?

Yes, it is widely known, though experts note it detects hair loss fairly late and newer tools like the FPHL-SI aim to pick up earlier changes ¹.

Is grade III common?

Less common. In one study of postmenopausal women with pattern hair loss, 4.3% were grade III ³.

Who created the Ludwig scale?

Erich Ludwig, in a 1977 paper classifying the stages of female pattern hair loss ².

Educational content. Not medical advice.