How Long Does It Take For Nails To Grow?

Fingernails grow about 3 to 3.5 millimeters (roughly 0.12 inches) per month. That means a completely new fingernail — from the base of the nail bed to the free edge — takes about four to six months to fully replace itself. Toenails grow much more slowly, at roughly 1 millimeter per month, so a full toenail replacement can take 12 to 18 months.

Those averages come from decades of dermatology research on nail growth rates. They are useful benchmarks, but individual growth varies with age, health, circulation, and even which finger you’re looking at. The thumbnail on your dominant hand, for example, tends to grow faster than the nail on your little finger.

How Fast Do Nails Actually Grow?

Nails are made of a protein called keratin, the same material found in hair. They grow from a structure called the nail matrix, located under the skin at the base of the nail. New cells form in the matrix, get pushed forward, and harden into the visible nail plate as they move.

Fingernails grow at roughly 0.1 millimeter per day, which works out to about 3 to 3.5 millimeters per month. Toenails grow closer to 0.03 to 0.05 millimeters per day, or about 1 millimeter per month. This difference is largely due to reduced blood flow to the feet and the fact that toenails are shorter and experience more friction from shoes.

Growth is not perfectly uniform across all nails. The nails on your dominant hand tend to grow slightly faster. The middle finger often grows faster than the thumb or pinky. And growth is typically fastest in your teens and twenties, then gradually slows with age.

What affects nail growth speed?

Several factors influence how quickly your nails grow:

• Age — growth peaks in adolescence and early adulthood, then declines slowly
• Circulation — better blood flow supports faster growth
• Hormones — pregnancy and some hormonal changes can speed up growth
• Nutrition — severe deficiencies in protein, iron, zinc, or biotin can slow growth
• Time of year — some research suggests nails grow slightly faster in summer
• Injury or illness — trauma to the matrix or serious illness can temporarily halt growth

One of the more interesting findings in nail research is that the rate of growth is not simply a cosmetic detail. Because nails grow at a predictable pace, clinicians sometimes use the position of a new nail band or ridge to estimate when a past illness, injury, or nutritional problem occurred. This is called nail chronology, and it has been used in forensic and medical contexts.

How Long Does It Take For A Toenail To Grow Back?

A full toenail takes 12 to 18 months to grow back completely after being lost or removed. That timeline is one of the most well-established facts in dermatology, and it’s why toenail problems can be so frustrating to treat.

The big toe grows the slowest of all toenails. The smaller toes grow somewhat faster, but still much slower than fingernails. If a toenail is surgically removed, the new nail may take well over a year to reach the tip of the toe.

Partial nail removal — where only part of the nail is taken — will regrow faster because less distance needs to be covered. But the regrown nail may not look exactly like the original, especially if the matrix was damaged. In some cases, the nail grows back thicker, thinner, or with a permanent ridge.

Why Do Nails Grow So Slowly?

Nails grow slowly because they are not essential for survival in the way skin or blood is. The body prioritizes resources for critical organs and systems first. Nails and hair are sometimes called “accessory structures” — they serve protective and sensory functions, but the body does not treat them as urgent.

The nail matrix also has a relatively limited blood supply compared to actively dividing tissues like the lining of the gut. Cell division in the matrix is steady but not rapid. This is why a serious illness, major surgery, or a period of malnutrition can leave a visible mark on your nails that takes months to grow out.

Toenails grow even more slowly than fingernails because they are farther from the heart, receive less blood flow, and are subject to constant pressure from footwear. The big toe, in particular, has a large nail plate and a slow growth rate, which is why toenail fungus can be so difficult to clear — the infected nail has to be replaced entirely by new growth.

What Slows Down Nail Growth?

Several medical conditions and lifestyle factors can slow nail growth or change how nails look. It’s important to note that slow growth alone is rarely a sign of a serious problem, but it can be a clue when combined with other symptoms.

• Poor circulation — peripheral artery disease or Raynaud’s phenomenon can reduce blood flow to the extremities
• Nutritional deficiencies — iron-deficiency anemia, low protein intake, and zinc deficiency are linked to slow or abnormal nail growth
• Thyroid disorders — both hypothyroidism and hyperthyroidism can affect nail growth and texture
• Psoriasis — can cause pitting, ridges, and separation of the nail from the nail bed
• Chemotherapy — many chemotherapy drugs temporarily slow or stop nail growth
• Fungal infections — can thicken and deform the nail, making normal growth appear stalled
• Age — growth rate naturally declines over time

If you notice a sudden change in nail growth, new ridges, discoloration, or a nail that has stopped growing entirely, it’s worth mentioning to a doctor. Most causes are benign, but a few — like melanoma under the nail — need early attention.

Can You Make Nails Grow Faster?

There is no proven way to significantly speed up nail growth. The rate is largely set by genetics, age, and overall health. No topical product has been shown in large human trials to meaningfully increase the speed at which nails grow.

That said, supporting overall health can help you avoid slow growth caused by deficiencies. Eating enough protein, getting adequate iron and zinc, and managing conditions like thyroid disease can help nails grow at their normal rate. Biotin is widely marketed for nail growth, but the evidence is limited. Some small studies suggest biotin may help in people who are genuinely deficient, but for people with normal biotin levels, there is no strong evidence that it speeds up nail growth.

What you can do is protect the nail so it grows in without breaking or splitting. Keeping nails trimmed, moisturized, and protected from harsh chemicals or repeated trauma helps them reach their full length. If your nails are brittle or peeling, that’s usually a sign of dryness or repeated wet-dry cycling, not slow growth.

One clarification worth making: nail “growth” and nail “strength” are different things. A product that makes nails stronger or less likely to break does not necessarily make them grow faster. Those are separate claims, and the second one is much harder to support with evidence.

How Long Does It Take For A Fingernail To Grow Back After Being Lost?

If a fingernail is completely lost — from injury, infection, or surgery — it typically takes four to six months to grow back fully. The new nail starts forming at the matrix within days, but it takes weeks before it becomes visible at the base of the nail bed.

The regrowth timeline depends on how much of the matrix was damaged. If the matrix is intact, the nail usually grows back normally. If the matrix is scarred or injured, the new nail may be permanently deformed, split, or absent in part. This is why nail bed injuries are often treated carefully by hand specialists — preserving the matrix is key to a good cosmetic outcome.

During regrowth, the new nail may look thin, uneven, or discolored at first. This is normal. It usually thickens and smooths out as it grows forward.

When Should You Be Concerned About Nail Growth?

Slow nail growth on its own is rarely a medical emergency. But certain changes warrant a medical evaluation:

• A dark streak or spot under the nail that appears without injury and does not grow out
• Sudden stopping of growth in one nail
• Pain, swelling, or redness around the nail
• Significant thickening, crumbling, or separation of the nail from the nail bed
• Nail changes accompanied by fatigue, weight changes, or other systemic symptoms

These signs can have many causes, and most are not serious. But because nails can reflect underlying health, it’s reasonable to get them checked if something changes and persists.