Enter two dated wound measurements to get the percent area reduction — and see whether the wound is on track against the 4-week healing benchmark.
Clinical decision support only — not a diagnosis. Trajectory is one input among many. Always use clinical judgment and your facility's protocol.
Research on diabetic foot ulcers (Coerper et al., in a cohort of 704 patients) found that roughly 50% wound area reduction at 4 weeks predicts eventual healing. The corollary is the useful part: a wound below about 40–50% reduction at four weeks is waving a flag — reassess the plan rather than repeating it.
Percent area reduction is simple: (first area − second area) ÷ first area × 100. What makes it powerful is consistency — same measurement method, every visit, plotted over time. Two points give a direction; three or more give a trajectory you can act on.
Percent area reduction = (first area − second area) ÷ first area × 100, over the days between the two measurements. This calculator computes it from two dated measurements.
Research on diabetic foot ulcers (Coerper et al.) found that roughly 50% area reduction at 4 weeks predicts eventual healing. Wounds below about 40–50% at four weeks should have their treatment plan reassessed.
A stalled trajectory should trigger reassessment: recheck vascular status, offloading, infection, nutrition, and whether the current dressing and debridement plan are working — per clinical judgment and protocol.
Most protocols measure at each visit or weekly. Consistent method (same technique each time) matters more than frequency for a valid trajectory.
Reviva plots every wound's healing trajectory automatically and flags stalled wounds — no spreadsheets, no manual math.
See Reviva