diff --git a/src/foam/mlang/Constant.js b/src/foam/mlang/Constant.js
index 7583e6a9c4..3787dcc5b3 100644
--- a/src/foam/mlang/Constant.js
+++ b/src/foam/mlang/Constant.js
@@ -76,9 +76,12 @@ foam.CLASS({
         return '\"' + this.value + '\"';
 
       if ( typeof this.value === 'number' && ! Number.isInteger(this.value) && isFinite(this.value) ) {
-        var s = this.value.toFixed(20);
-        s = s.replace(/0+$/, '');
-        if ( s.endsWith('.') ) s += '0';
+        var s = String(this.value);
+        if ( s.indexOf('e') !== -1 || s.indexOf('E') !== -1 ) {
+          s = this.value.toFixed(20);
+          s = s.replace(/0+$/, '');
+          if ( s.endsWith('.') ) s += '0';
+        }
         return s;
       }
 
diff --git a/src/foam/parse/SimpleQueryParser.java b/src/foam/parse/SimpleQueryParser.java
index a1d1c03e68..0456f48003 100644
--- a/src/foam/parse/SimpleQueryParser.java
+++ b/src/foam/parse/SimpleQueryParser.java
@@ -110,17 +110,21 @@ private foam.lib.parse.Grammar buildGrammar() {
   // ───────── Primitive Symbols ─────────
 
   private void buildPrimitiveSymbols(foam.lib.parse.Grammar g) {
-    // digits: one or more digit chars joined into a string
-    g.addSymbol("digits", new Join(new Repeat(Range.create('0', '9'), 1)));
+    // rawDigits: base grammar for one or more digit chars, no action (preserves leading zeros)
+    g.addSymbol("rawDigits", new Join(new Repeat(Range.create('0', '9'), 1)));
 
-    // float: optional negative, digits, optional decimal part → joined string
+    // digits: delegates to rawDigits, but has a parseInt action (see buildActions)
+    g.addSymbol("digits", g.sym("rawDigits"));
+
+    // float: optional negative, rawDigits, optional decimal part → joined string
+    // Uses rawDigits (not digits) to avoid parseInt stripping leading zeros (e.g., "001" → 1)
     g.addSymbol("float",
       new Seq1(1,
         g.sym("ws"),
         new Join(new Seq(
           new Optional(Literal.create("-")),
-          g.sym("digits"),
-          new Optional(new Join(new Seq(Literal.create("."), new Optional(g.sym("digits")))))))));
+          g.sym("rawDigits"),
+          new Optional(new Join(new Seq(Literal.create("."), new Optional(g.sym("rawDigits")))))))));
 
     // floats: two or more floats separated by comma (for IN RANGE)
     g.addSymbol("floats", new Repeat(g.sym("float"), Literal.create(","), 2));
diff --git a/src/foam/parse/SimpleQueryParser.js b/src/foam/parse/SimpleQueryParser.js
index 91b2b7a638..d502ff5456 100644
--- a/src/foam/parse/SimpleQueryParser.js
+++ b/src/foam/parse/SimpleQueryParser.js
@@ -189,10 +189,14 @@ foam.CLASS({
 
           'range float': seq1(1, sym('ws'), sym('floats'), sym('ws'), ')'),
 
-          digits: str(repeat(range('0', '9'), null, 1)),
+          // rawDigits: base grammar for one or more digit chars, no action (preserves leading zeros)
+          rawDigits: str(repeat(range('0', '9'), null, 1)),
+
+          // digits: delegates to rawDigits, but has a parseInt action (see actions below)
+          digits: sym('rawDigits'),
 
           // TODO replace '.' with an internationalized decimal point, or have the input preprocessed
-          float: seq1(1, sym('ws'), str(seq(optional('-'), sym('digits'), optional(str(seq('.', optional(sym('digits')))))))),
+          float: seq1(1, sym('ws'), str(seq(optional('-'), sym('rawDigits'), optional(str(seq('.', optional(sym('rawDigits')))))))),
 
           numberArray: seq1(1, sym('ws'), sym('numbers'), sym('ws'), ')'),
 
diff --git a/src/foam/parse/test/SimpleQueryParserJavaTest.js b/src/foam/parse/test/SimpleQueryParserJavaTest.js
index ef2c0245d7..45004629f4 100644
--- a/src/foam/parse/test/SimpleQueryParserJavaTest.js
+++ b/src/foam/parse/test/SimpleQueryParserJavaTest.js
@@ -267,6 +267,35 @@ foam.CLASS({
           ft12.toLowerCase().contains("latitude"),
           "Float Test12: Inner property NOT IN RANGE produces OR — got: " + ft12
         );
+
+        // Float Test13: Small float IN RANGE preserves decimal precision
+        String ft13 = buildPredicate("address.latitude IN RANGE (-0.0001, 0.0001)");
+        test(ft13 != null, "Float Test13: Small float IN RANGE (-0.0001, 0.0001) parses");
+        test(
+          ft13.contains("-1.000001E-4") || ft13.contains("-0.0001000001") || ft13.contains("-1.0001E-4"),
+          "Float Test13: Small float IN RANGE lower bound preserves magnitude — got: " + ft13
+        );
+        test(
+          ! ft13.contains("0.1") || ft13.contains("0.0001"),
+          "Float Test13: Small float IN RANGE does NOT corrupt to 0.1 — got: " + ft13
+        );
+
+        // Float Test14: Small float equality preserves decimal precision
+        String ft14 = buildPredicate("address.longitude = 0.001");
+        test(ft14 != null, "Float Test14: Small float = 0.001 parses");
+        test(
+          ! ft14.contains("0.1,") && ! ft14.contains(", 0.1"),
+          "Float Test14: Small float = 0.001 does NOT corrupt to 0.1 — got: " + ft14
+        );
+
+        // Float Test15: Small float NOT IN RANGE preserves precision
+        String ft15 = buildPredicate("address.latitude NOT IN RANGE (-0.0001, 0.0001)");
+        test(ft15 != null, "Float Test15: Small float NOT IN RANGE parses");
+        test(
+          ft15.toLowerCase().contains("or(") &&
+          ft15.toLowerCase().contains("gte(") && ft15.toLowerCase().contains("lt("),
+          "Float Test15: Small float NOT IN RANGE produces OR(GTE,LT) — got: " + ft15
+        );
       `
     },
 
diff --git a/src/foam/parse/test/SimpleQueryParserMQLTest.js b/src/foam/parse/test/SimpleQueryParserMQLTest.js
index 22b74b6d88..aead61ecd4 100644
--- a/src/foam/parse/test/SimpleQueryParserMQLTest.js
+++ b/src/foam/parse/test/SimpleQueryParserMQLTest.js
@@ -18,11 +18,14 @@ foam.CLASS({
       var EPSILON = 0.0000000001;
       var f = function(num) { return num - EPSILON; };
       var g = function(num) { return num + EPSILON; };
-      // Format a float the same way Constant.toMQL does
+      // Expected float formatting: String() for normal decimals, toFixed for scientific notation
       var fmt = function(num) {
-        var s = num.toFixed(20);
-        s = s.replace(/0+$/, '');
-        if ( s.endsWith('.') ) s += '0';
+        var s = String(num);
+        if ( s.indexOf('e') !== -1 || s.indexOf('E') !== -1 ) {
+          s = num.toFixed(20);
+          s = s.replace(/0+$/, '');
+          if ( s.endsWith('.') ) s += '0';
+        }
         return s;
       };
       // Format a date the same way Constant.toMQL does (truncate at second colon)
@@ -120,6 +123,43 @@ foam.CLASS({
         '(latitude>=' + fmt(g(8.5)) + ' OR latitude<' + fmt(f(6.5)) + ')'),
         'Float MQL 8: NOT IN RANGE');
 
+      // ── Float small-value precision (Constant.toMQL must not corrupt small floats) ──
+      x.test(this.constantToMQL(0.001) === '0.001',
+        'Float MQL constant 1: 0.001 formats correctly, got: ' + this.constantToMQL(0.001));
+      x.test(this.constantToMQL(0.0001) === '0.0001',
+        'Float MQL constant 2: 0.0001 formats correctly, got: ' + this.constantToMQL(0.0001));
+      x.test(this.constantToMQL(-0.0001) === '-0.0001',
+        'Float MQL constant 3: -0.0001 formats correctly, got: ' + this.constantToMQL(-0.0001));
+      x.test(this.constantToMQL(0.5) === '0.5',
+        'Float MQL constant 4: 0.5 formats correctly, got: ' + this.constantToMQL(0.5));
+      x.test(this.constantToMQL(0.1) === '0.1',
+        'Float MQL constant 5: 0.1 formats correctly, got: ' + this.constantToMQL(0.1));
+      x.test(this.constantToMQL(1.23) === '1.23',
+        'Float MQL constant 6: 1.23 formats correctly, got: ' + this.constantToMQL(1.23));
+      x.test(this.constantToMQL(0.00000001) === '0.00000001',
+        'Float MQL constant 7: 0.00000001 formats correctly, got: ' + this.constantToMQL(0.00000001));
+
+      // ── Float epsilon-adjusted small values (the values that actually appear in MQL) ──
+      x.test(this.constantToMQL(f(0.0001)) === String(f(0.0001)),
+        'Float MQL epsilon 1: f(0.0001) no corruption, got: ' + this.constantToMQL(f(0.0001)));
+      x.test(this.constantToMQL(g(0.0001)) === String(g(0.0001)),
+        'Float MQL epsilon 2: g(0.0001) no corruption, got: ' + this.constantToMQL(g(0.0001)));
+      x.test(this.constantToMQL(f(-0.0001)) === String(f(-0.0001)),
+        'Float MQL epsilon 3: f(-0.0001) no corruption, got: ' + this.constantToMQL(f(-0.0001)));
+      x.test(this.constantToMQL(g(-0.0001)) === String(g(-0.0001)),
+        'Float MQL epsilon 4: g(-0.0001) no corruption, got: ' + this.constantToMQL(g(-0.0001)));
+
+      // ── Float IN RANGE with small values (user-reported bug) ──
+      x.test(this.isValidMQL('address.latitude IN RANGE (-0.0001, 0.0001)',
+        'latitude>=' + String(f(-0.0001)) + ' AND latitude<' + String(g(0.0001))),
+        'Float MQL small range 1: IN RANGE (-0.0001, 0.0001)');
+      x.test(this.isValidMQL('address.latitude NOT IN RANGE (-0.0001, 0.0001)',
+        '(latitude>=' + String(g(0.0001)) + ' OR latitude<' + String(f(-0.0001)) + ')'),
+        'Float MQL small range 2: NOT IN RANGE (-0.0001, 0.0001)');
+      x.test(this.isValidMQL('address.latitude IN RANGE (0.001, 0.01)',
+        'latitude>=' + String(f(0.001)) + ' AND latitude<' + String(g(0.01))),
+        'Float MQL small range 3: IN RANGE (0.001, 0.01)');
+
       // ── Float scientific notation guard ──
       x.test(this.hasNoScientificNotation(this.buildMQL('address.longitude = 0')),
         'Float MQL 9: equals zero has no scientific notation');
@@ -235,6 +275,11 @@ foam.CLASS({
       return mql === expectedMQL;
     },
 
+    function constantToMQL(value) {
+      var c = foam.mlang.Constant.create({ value: value });
+      return c.toMQL();
+    },
+
     function hasNoScientificNotation(mql) {
       if ( mql == null ) return false;
       console.log('Scientific notation check: ' + mql);
diff --git a/src/foam/parse/test/SimpleQueryParserTest.js b/src/foam/parse/test/SimpleQueryParserTest.js
index 4353077de7..4e2cf74502 100644
--- a/src/foam/parse/test/SimpleQueryParserTest.js
+++ b/src/foam/parse/test/SimpleQueryParserTest.js
@@ -75,6 +75,20 @@ foam.CLASS({
       x.test(this.isValid("address.latitude IN RANGE (6.5, 8.5)", "AND(GTE(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatStart(6.5) + "),LT(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatEnd(8.5) + "))"), "Float Test11: Inner property is within range 6.5 to 8.5");
       x.test(this.isValid('address.latitude NOT IN RANGE (6.5, 8.5)', "OR(GTE(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatEnd(8.5) + "),LT(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatStart(6.5) + "))"), 'Float Test12: Inner property is not within range 6.5 to 8.5');
 
+      // Float small-value precision tests — parser must preserve leading zeros after decimal
+      x.test(this.isValidSymbol('float', '0.001', '0.001', true), 'Float Test13: Small float 0.001 preserves precision');
+
+      // Float small-value IN RANGE — the user-reported bug
+      x.test(this.isValid("address.latitude IN RANGE (-0.0001, 0.0001)",
+        "AND(GTE(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatStart(-0.0001) + "),LT(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatEnd(0.0001) + "))"),
+        "Float Test16: Small float IN RANGE (-0.0001, 0.0001)");
+      x.test(this.isValid('address.latitude NOT IN RANGE (-0.0001, 0.0001)',
+        "OR(GTE(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatEnd(0.0001) + "),LT(foam.core.auth.User.address.foam.core.auth.Address.latitude, " + testFloatStart(-0.0001) + "))"),
+        'Float Test17: Small float NOT IN RANGE (-0.0001, 0.0001)');
+      x.test(this.isValid("address.longitude = 0.001",
+        "AND(GTE(foam.core.auth.User.address.foam.core.auth.Address.longitude, " + testFloatStart(0.001) + "),LT(foam.core.auth.User.address.foam.core.auth.Address.longitude, " + testFloatEnd(0.001) + "))"),
+        "Float Test18: Small float equals 0.001");
+
       // Date format tests
       x.test(this.isValidSymbol('date', '2025-01-01', [testDate([2025, 0, 1, 12]), testDate([2025, 0, 2, 12])].toString()), 'Date Test1: ISO date YYYY-MM-DD');
       x.test(this.isValidSymbol('date', '25/10/01', [testDate([2025, 9, 1, 12]), testDate([2025, 9, 2, 12])].toString()), 'Date Test2: Short date YY/MM/DD');