diff --git a/sfm/sfm_webapp.html b/sfm/sfm_webapp.html
index c99efc5..297f232 100644
--- a/sfm/sfm_webapp.html
+++ b/sfm/sfm_webapp.html
@@ -637,6 +637,7 @@ let eventList     = [];
 let currentEvent  = 0;
 let charts        = {};
 let geoRange      = 6.206;
+const DBL_REF     = 2.9e-9;   // 20 µPa in psi — reference pressure for dBL
 const CHANNEL_COLORS = { Tran:'#58a6ff', Vert:'#3fb950', Long:'#d29922', Mic:'#bc8cff' };
 
 // ── Helpers ────────────────────────────────────────────────────────────────────
@@ -945,7 +946,8 @@ function updatePeaksBar(ev) {
   qs('pk-tran').textContent = pv.tran_in_s   != null ? `${pv.tran_in_s.toFixed(5)} in/s` : '—';
   qs('pk-vert').textContent = pv.vert_in_s   != null ? `${pv.vert_in_s.toFixed(5)} in/s` : '—';
   qs('pk-long').textContent = pv.long_in_s   != null ? `${pv.long_in_s.toFixed(5)} in/s` : '—';
-  qs('pk-mic').textContent  = pv.micl_psi    != null ? `${pv.micl_psi.toExponential(3)} psi` : '—';
+  const micDbl = pv.micl_psi != null && pv.micl_psi > 0 ? 20 * Math.log10(pv.micl_psi / DBL_REF) : null;
+  qs('pk-mic').textContent  = micDbl != null ? `${micDbl.toFixed(1)} dBL` : '—';
   qs('pk-pvs').textContent  = pv.peak_vector_sum != null ? `${pv.peak_vector_sum.toFixed(5)} in/s` : '—';
 }
 
@@ -1008,7 +1010,6 @@ function renderWaveform(data) {
   Object.values(charts).forEach(c => c.destroy()); charts = {};
 
   const micPeakPsi = data.peak_values?.micl_psi ?? null;
-  const DBL_REF    = 2.9e-9;
 
   for (const [ch, color] of Object.entries(CHANNEL_COLORS)) {
     const samples = channels[ch];
@@ -1031,7 +1032,7 @@ function renderWaveform(data) {
       plotData  = samples.map(s => s * micScale);
       const peakPsi = Math.max(...plotData.map(Math.abs));
       const peakDbl = peakPsi > 0 ? 20 * Math.log10(peakPsi / DBL_REF) : -Infinity;
-      peakLabel = `${peakDbl.toFixed(1)} dBL  (${peakPsi.toExponential(3)} psi)`;
+      peakLabel = `${peakDbl.toFixed(1)} dBL`;
       yUnit     = 'psi';
       ttFmt     = v => `${v.toExponential(3)} psi`;
       tickFmt   = v => v.toExponential(1);