diff --git a/src/kiri-mode/sla/client.js b/src/kiri-mode/sla/client.js
index 3bd2a84b..5a7b7e16 100644
--- a/src/kiri-mode/sla/client.js
+++ b/src/kiri-mode/sla/client.js
@@ -20,7 +20,7 @@
     };
 
     SLA.printDownload = function(output, API, names) {
-        const { file, width, height, layers } = output;
+        const { file, width, height, layers, volume } = output;
         const fileroot = names[0] || "print";
         const filename = `${fileroot}-${new Date().getTime().toString(36)}`;
 
@@ -61,6 +61,7 @@
             print_hrs = print_hrs.toString().padStart(2,'0');
 
             $('print-filename').value = filename;
+            $('print-volume').value = Math.round(volume);
             $('print-layers').value = layers;
             $('print-time').value = `${print_hrs}:${print_min}:${print_sec}`;
 
diff --git a/src/kiri-mode/sla/export.js b/src/kiri-mode/sla/export.js
index a692f74f..c2daf535 100644
--- a/src/kiri-mode/sla/export.js
+++ b/src/kiri-mode/sla/export.js
@@ -24,9 +24,11 @@
             height = device.resolutionY,
             scaleX = width / device.bedWidth,
             scaleY = height / device.bedDepth,
+            layerZ = process.slaSlice,
             alias = process.slaAntiAlias || 1,
             mark = Date.now(),
-            layermax = 0;
+            layermax = 0,
+            volume = 0;
 
         // filter ignored widgets
         widgets = widgets.filter(w => !w.track.ignore && !w.meta.disabled);
@@ -64,7 +66,8 @@
 
             for (let index=0; index < layermax; index++) {
                 let param = { index, width, height, widgets, scaleX, scaleY, masks };
-                let {image, layers, end} = render(param);
+                let { image, layers, end, area } = render(param);
+                volume += (area * layerZ);
                 images.push(image);
                 slices.push(layers);
                 online({
@@ -89,7 +92,7 @@
             }, (progress, message) => {
                 online({progress: progress * part2 + part1, message});
             });
-            ondone({ width, height, file, layers: images.length }, [file]);
+            ondone({ width, height, file, layers: images.length, volume }, [file]);
         } else {
             let part1 = 0.95;
             let part2 = 1 - part1;
@@ -97,7 +100,8 @@
 
             for (let index=0; index < layermax; index++) {
                 let param = { index, width, height, widgets, scaleX, scaleY };
-                let {lines} = CXDLP.render(param);
+                let { lines, area } = CXDLP.render(param);
+                volume += (area * layerZ);
                 slices.push(lines);
                 online({
                     progress: (index / layermax) * part1,
@@ -151,7 +155,8 @@
                 width: width,
                 height: height,
                 file: file,
-                layers: slices.length
+                layers: slices.length,
+                volume
             }, [file]);
         }
 
diff --git a/src/kiri-mode/sla/x_cxdlp.js b/src/kiri-mode/sla/x_cxdlp.js
index 7c829930..f4c3e75e 100644
--- a/src/kiri-mode/sla/x_cxdlp.js
+++ b/src/kiri-mode/sla/x_cxdlp.js
@@ -335,6 +335,7 @@
         let width2 = width / 2, height2 = height / 2;
         let array = [];
         let count = 0;
+        let area = 0;
 
         function scaleMovePoly(poly) {
             let points = poly.points;
@@ -401,6 +402,7 @@
         // scale and move all polys to fit in rendered platform coordinates
         for (let i=0, il=array.length; i<il; i++) {
             let poly = array[i];
+            area += poly.areaDeep();
             scaleMovePoly(poly);
             writePoly(writer, poly);
         }
@@ -425,8 +427,7 @@
                 lastv = v;
             }
         }
-        return { lines };
-        // return { image, lines };
+        return { lines, area };
     }
 
     if (!self.navigator && self.process && self.process.env) {
diff --git a/src/kiri-mode/sla/x_photon.js b/src/kiri-mode/sla/x_photon.js
index 8ba1f7ca..ee51686f 100644
--- a/src/kiri-mode/sla/x_photon.js
+++ b/src/kiri-mode/sla/x_photon.js
@@ -391,6 +391,7 @@
         let width2 = width / 2, height2 = height / 2;
         let array = [];
         let count = 0;
+        let area = 0;
 
         function scaleMovePoly(poly) {
             let points = poly.points;
@@ -457,6 +458,7 @@
         // scale and move all polys to fit in rendered platform coordinates
         for (let i=0, il=array.length; i<il; i++) {
             let poly = array[i];
+            area += poly.areaDeep();
             scaleMovePoly(poly);
             writePoly(writer, poly);
         }
@@ -469,7 +471,7 @@
             layers.push(wasm.heap.slice(imagelen, imagelen + rlelen));
         }
 
-        return { image, layers, end: count === 0 };
+        return { image, layers, end: count === 0, area };
     }
 
     // legacy JS-only rasterizer uses OffscreenCanvas
@@ -480,6 +482,7 @@
         let ctx = layer.getContext('2d');
         ctx.fillStyle = 'rgb(200, 0, 0)';
         let count = 0;
+        let area = 0;
         widgets.forEach(widget => {
             let slice = widget.slices[index];
             if (slice) {
@@ -489,6 +492,7 @@
                 if (!polys) polys = slice.tops.map(t => t.poly);
                 if (slice.supports) polys.appendAll(slice.supports);
                 polys.forEach(poly => {
+                    area += poly.areaDeep();
                     poly.move(widget.track.pos);
                     ctx.beginPath();
                     polyout(poly.setClockwise(), ctx, opt);
@@ -510,7 +514,7 @@
         for (let i=0; i<red.length; i++) {
             red[i] = data[i*4];
         }
-        return { image: red, end: count === 0 };
+        return { image: red, end: count === 0, area };
     }
 
     function polyout(poly, ctx, opt) {
diff --git a/web/kiri/output-sla.html b/web/kiri/output-sla.html
index 57606c0a..4a6f4552 100644
--- a/web/kiri/output-sla.html
+++ b/web/kiri/output-sla.html
@@ -1,7 +1,8 @@
 <div class="header"><label>export</label></div>
 <div id="print-info" class="f-col box">
     <div><label>file name</label><input id="print-filename" size="20" spellcheck="false" /></div>
-    <div><label>print layers</label><input id="print-layers" size="10" spellcheck="false" /></div>
+    <div><label>layers</label><input id="print-layers" size="10" spellcheck="false" /></div>
+    <div><label>volume</label><input id="print-volume" size="10" spellcheck="false" /></div>
     <div><label>print time</label><input id="print-time" size="10" spellcheck="false" /></div>
 </div>