diff --git a/src/main/java/com/metaweb/gridworks/browsing/facets/ExpressionNumericRowBinner.java b/src/main/java/com/metaweb/gridworks/browsing/facets/ExpressionNumericRowBinner.java
new file mode 100644
index 000000000..c95e2cf8a
--- /dev/null
+++ b/src/main/java/com/metaweb/gridworks/browsing/facets/ExpressionNumericRowBinner.java
@@ -0,0 +1,61 @@
+package com.metaweb.gridworks.browsing.facets;
+
+import java.util.Properties;
+
+import com.metaweb.gridworks.browsing.RowVisitor;
+import com.metaweb.gridworks.expr.Evaluable;
+import com.metaweb.gridworks.model.Cell;
+import com.metaweb.gridworks.model.Project;
+import com.metaweb.gridworks.model.Row;
+
+public class ExpressionNumericRowBinner implements RowVisitor {
+	final protected Evaluable 		_evaluable;
+	final protected int 			_cellIndex;
+	final protected NumericBinIndex	_index;
+	
+	final public int[] bins;
+	
+	public ExpressionNumericRowBinner(Evaluable evaluable, int cellIndex, NumericBinIndex index) {
+		_evaluable = evaluable;
+		_cellIndex = cellIndex;
+		_index = index;
+		bins = new int[_index.getBins().length];
+	}
+	
+	@Override
+	public boolean visit(Project project, int rowIndex, Row row) {
+		if (_cellIndex < row.cells.size()) {
+			Cell cell = row.cells.get(_cellIndex);
+			if (cell != null) {
+				Properties bindings = new Properties();
+				
+				bindings.put("project", project);
+				bindings.put("cell", cell);
+				bindings.put("value", cell.value);
+				
+				Object value = _evaluable.evaluate(bindings);
+				if (value != null) {
+					if (value.getClass().isArray()) {
+						Object[] a = (Object[]) value;
+						for (Object v : a) {
+							processValue(v);
+						}
+					} else {
+						processValue(value);
+					}
+				}
+			}
+		}
+		return false;
+	}
+	
+	protected void processValue(Object value) {
+		if (value instanceof Number) {
+			double d = ((Number) value).doubleValue();
+			
+			int bin = (int) Math.round((d - _index.getMin()) / _index.getStep());
+			
+			bins[bin]++;
+		}
+	}
+}
diff --git a/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java b/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java
index d7c0c168c..5d36cd941 100644
--- a/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java
+++ b/src/main/java/com/metaweb/gridworks/browsing/facets/RangeFacet.java
@@ -24,6 +24,7 @@ public class RangeFacet implements Facet {
 	protected double	_min;
 	protected double	_max;
 	protected double	_step;
+	protected int[]		_baseBins;
 	protected int[]		_bins;
 	
 	protected double	_from;
@@ -50,6 +51,12 @@ public class RangeFacet implements Facet {
 		}
 		writer.endArray();
 		
+		writer.key("baseBins"); writer.array();
+		for (int b : _baseBins) {
+			writer.value(b);
+		}
+		writer.endArray();
+		
 		writer.key("mode"); writer.value(_mode);
 		if ("min".equals(_mode)) {
 			writer.key("from"); writer.value(_from);
@@ -118,6 +125,13 @@ public class RangeFacet implements Facet {
 		_min = index.getMin();
 		_max = index.getMax();
 		_step = index.getStep();
-		_bins = index.getBins();
+		_baseBins = index.getBins();
+		
+		ExpressionNumericRowBinner binner = 
+			new ExpressionNumericRowBinner(_eval, _cellIndex, index);
+		
+		filteredRows.accept(project, binner);
+		
+		_bins = binner.bins;
 	}
 }
diff --git a/src/main/webapp/scripts/project/range-facet.js b/src/main/webapp/scripts/project/range-facet.js
index 12e7cf6f9..c9ddecf29 100644
--- a/src/main/webapp/scripts/project/range-facet.js
+++ b/src/main/webapp/scripts/project/range-facet.js
@@ -138,6 +138,7 @@ RangeFacet.prototype.updateState = function(data) {
     this._config.min = data.min;
     this._config.max = data.max;
     this._config.step = data.step;
+    this._baseBins = data.baseBins;
     this._bins = data.bins;
     
     switch (this._config.mode) {
@@ -165,16 +166,22 @@ RangeFacet.prototype.render = function() {
     this._sliderDiv.slider("option", "step", this._config.step);
     
     var max = 0;
-    for (var i = 0; i < this._bins.length; i++) {
-        max = Math.max(max, this._bins[i]);
+    for (var i = 0; i < this._baseBins.length; i++) {
+        max = Math.max(max, this._baseBins[i]);
     }
+    
     if (max == 0) {
         this._histogramDiv.hide();
     } else {
-        var a = [];
-        for (var i = 0; i < this._bins.length; i++) {
+        var values = [];
+        var diffs = [];
+        
+        for (var i = 0; i < this._baseBins.length; i++) {
             var v = Math.ceil(100 * this._bins[i] / max);
-            a.push(v == 0 ? 0 : Math.max(2, v)); // use min 2 to make sure something shows up
+            var diff = Math.ceil(100 * this._baseBins[i] / max) - v;
+            
+            values.push(v == 0 ? 0 : Math.max(2, v)); // use min 2 to make sure something shows up
+            diffs.push(diff == 0 ? 0 : Math.max(2, diff));
         }
         
         this._histogramDiv.empty().show();
@@ -182,8 +189,8 @@ RangeFacet.prototype.render = function() {
             "http://chart.apis.google.com/chart?" + [
                 "chs=" + this._histogramDiv[0].offsetWidth + "x50",
                 //"cht=ls&chm=o,ff6600,0,-1,3&chls=0", // use for line plot
-                "cht=bvs&chbh=r,0&chco=000088", // use for histogram
-                "chd=t:" + a.join(",")
+                "cht=bvs&chbh=r,0&chco=000088,aaaaff", // use for histogram
+                "chd=t:" + values.join(",") + "|" + diffs.join(",")
             ].join("&")
         ).appendTo(this._histogramDiv);
     }