diff --git a/addons/web/static/src/views/fields/parsers.js b/addons/web/static/src/views/fields/parsers.js
index 9655b0c31b5..8f4187fa8c1 100644
--- a/addons/web/static/src/views/fields/parsers.js
+++ b/addons/web/static/src/views/fields/parsers.js
@@ -159,20 +159,26 @@ export function parsePercentage(value) {
 
 /**
  * Try to extract a monetary value from a string. The localization is considered in the process.
- * This is a very lenient function such that it just strips non-numeric characters at the
- * beginning and end of the string, and then tries to parse the remaining string as a float.
+ * This is a very lenient function such that it ignores everything before we encounter a substring consisting of either
+ * - a sign (- or +)
+ * - an equals sign (signaling the start of a mathematical expression)
+ * - a decimal point
+ * - a number
+ * We then remove any non-numeric characters at the end
+ *
  *
  * @param {string} value
  * @returns {number}
  */
 export function parseMonetary(value) {
     value = value.trim();
-    const regex = new RegExp(`^[^\\d\\-+=]*(?<strToParse>.*?)[^\\d]*$`);
-    const match = value.match(regex);
-    if (!match) {
-        throw new InvalidNumberError(`"${value}" is not a valid number.`);
+    const startMatch = value.match(
+        new RegExp(`[\\d\\-+=]|${escapeRegExp(localization.decimalPoint)}`)
+    );
+    if (startMatch) {
+        value = value.substring(startMatch.index);
     }
-    value = match.groups.strToParse;
+    value = value.replace(/\D*$/, "");
     return parseFloat(value);
 }
 
diff --git a/addons/web/static/tests/views/fields/parsers_tests.js b/addons/web/static/tests/views/fields/parsers_tests.js
index d1a3036643a..6964b062536 100644
--- a/addons/web/static/tests/views/fields/parsers_tests.js
+++ b/addons/web/static/tests/views/fields/parsers_tests.js
@@ -129,6 +129,7 @@ QUnit.module("Fields", (hooks) => {
         assert.strictEqual(parseMonetary("100.00\u00a0€"), 100);
         assert.strictEqual(parseMonetary("-100.00"), -100);
         assert.strictEqual(parseMonetary("1,000.00"), 1000);
+        assert.strictEqual(parseMonetary(".1"), 0.1);
         assert.strictEqual(parseMonetary("1,000,000.00"), 1000000);
         assert.strictEqual(parseMonetary("$\u00a0125.00"), 125);
         assert.strictEqual(parseMonetary("1,000.00\u00a0€"), 1000);
@@ -165,6 +166,30 @@ QUnit.module("Fields", (hooks) => {
         assert.strictEqual(parseMonetary("1\u00a0000,14DOLLARS"), 1000.14);
         assert.strictEqual(parseMonetary("DOLLARS+1\u00a0000,15"), 1000.15);
         assert.strictEqual(parseMonetary("EURO-1\u00a0000,16DOGE"), -1000.16);
+
+        // comma as decimal point and dot as thousands separator
+        patchWithCleanup(localization, { thousandsSep: ".", decimalPoint: "," });
+        assert.strictEqual(parseMonetary("10,08"), 10.08);
+        assert.strictEqual(parseMonetary(""), 0);
+        assert.strictEqual(parseMonetary("0"), 0);
+        assert.strictEqual(parseMonetary("100,12\u00a0€"), 100.12);
+        assert.strictEqual(parseMonetary("-100,12"), -100.12);
+        assert.strictEqual(parseMonetary("1.000,12"), 1000.12);
+        assert.strictEqual(parseMonetary(",1"), 0.1);
+        assert.strictEqual(parseMonetary("1.000.000,12"), 1000000.12);
+        assert.strictEqual(parseMonetary("$\u00a0125,12"), 125.12);
+        assert.strictEqual(parseMonetary("1.000,00\u00a0€"), 1000);
+        assert.strictEqual(parseMonetary(","), 0);
+        assert.strictEqual(parseMonetary("1\u00a0"), 1);
+        assert.strictEqual(parseMonetary("\u00a01"), 1);
+        assert.strictEqual(parseMonetary("12,34 €"), 12.34);
+        assert.strictEqual(parseMonetary("$ 12,34"), 12.34);
+
+        // Can evaluate expression
+        assert.strictEqual(parseMonetary("=1.000,1 + 2.000,2"), 3000.3);
+        assert.strictEqual(parseMonetary("=1.000,00 + 11.121,00"), 12121);
+        assert.strictEqual(parseMonetary("=1000,00 + 11122,00"), 12122);
+        assert.strictEqual(parseMonetary("=1000 + 11123"), 12123);
     });
 
     QUnit.test("parsers fallback on english localisation", function (assert) {