Scar Healing Time Calculator
Estimate scar healing and fading time from wound type, body location, age, and skin tone.
Includes a month-by-month fading curve and tips to reduce scarring.
Scar healing is a gradual process that occurs in three overlapping phases: inflammation (days 1–5), proliferation (days 5–21), and remodeling (3 weeks to 2 years). The final appearance of a scar depends on wound type, location, genetics, age, and aftercare.
How the estimate is built
Start from a baseline for the wound type, then multiply by location, age, and skin type. That is the whole calculation, and every number below is the one the calculator actually uses.
| Wound type | Baseline to significant fading |
|---|---|
| Surgical incision | 9 months |
| Cut or laceration | 12 months |
| Burn | 24 months |
| Acne scar | 8 months |
Surgical incisions have the cleanest edges and the least tissue loss, so they fade fastest. Burns sit at the far end because deep burns destroy the dermal template the skin heals against, and a contracted burn scar can still be changing two years out.
| Location | Multiplier | Why |
|---|---|---|
| Face | ×0.7 | Best blood supply on the body |
| Arms or legs | ×1.0 | The reference case |
| Chest or shoulders | ×1.3 | High resting skin tension, and the classic keloid sites |
| Joints | ×1.4 | Reopened by movement thousands of times a day |
| Age | Multiplier |
|---|---|
| Under 20 | ×0.8 |
| 20–39 | ×1.0 |
| 40–59 | ×1.2 |
| 60 and over | ×1.4 |
| Fitzpatrick skin type | Multiplier |
|---|---|
| I–II, pale to fair | ×1.0 |
| III–IV, olive to light brown | ×1.15 |
| V–VI, brown to deep brown | ×1.3 |
Age cuts both ways, and the multiplier only captures half of it. Children and young adults close a wound faster but are considerably more likely to throw a raised hypertrophic scar while doing it. Older adults take longer and usually end up with a flatter, paler result. The number here tracks time, not quality.
The skin type multiplier is about pigment, not healing speed. Darker skin carries a higher risk of keloid formation and of post-inflammatory hyperpigmentation, and it is the pigment that takes the longest to settle. Lighter skin often stays red longer but ends up with less permanent discoloration.
A worked case: a laceration on a shoulder, age 45, Fitzpatrick III. That is 12 × 1.3 × 1.2 × 1.15, which comes to 22 months to significant fading and about 33 to full maturation.
Tips for minimizing scars: Keep the wound moist (petroleum jelly works well). Protect from sun exposure for at least 12 months - UV light darkens scars permanently. Silicone sheets or gel can reduce scar thickness by 20–40%. Massage the scar gently after the wound closes to break down excess collagen.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.