diff --git a/comfy_extras/nodes_math.py b/comfy_extras/nodes_math.py
index 873ee7b51..0883c65ac 100644
--- a/comfy_extras/nodes_math.py
+++ b/comfy_extras/nodes_math.py
@@ -102,11 +102,18 @@ class MathExpressionNode(io.ComfyNode):
                 f"Math Expression '{expression}' must evaluate to a numeric result, "
                 f"got {type(result).__name__}: {result!r}"
             )
-        if not math.isfinite(result):
+        try:
+            float_result = float(result)
+        except OverflowError:
+            raise ValueError(
+                f"Math Expression '{expression}' produced a result too large to "
+                f"represent as a float: {result}"
+            ) from None
+        if not math.isfinite(float_result):
             raise ValueError(
                 f"Math Expression '{expression}' produced a non-finite result: {result}"
             )
-        return io.NodeOutput(float(result), int(result), bool(result))
+        return io.NodeOutput(float_result, int(result), bool(result))
 
 
 class MathExtension(ComfyExtension):
diff --git a/tests-unit/comfy_extras_test/nodes_math_test.py b/tests-unit/comfy_extras_test/nodes_math_test.py
index 714e37c32..030accc5e 100644
--- a/tests-unit/comfy_extras_test/nodes_math_test.py
+++ b/tests-unit/comfy_extras_test/nodes_math_test.py
@@ -197,3 +197,10 @@ class TestMathExpressionExecute:
     def test_pow_huge_exponent_raises(self):
         with pytest.raises(ValueError, match="Exponent .* exceeds maximum"):
             self._exec("pow(a, b)", a=10, b=10000000)
+
+    def test_huge_int_result_raises_value_error(self):
+        # Exponent is within the allowed MAX_EXPONENT range, so the result is a
+        # finite Python int that is nonetheless too large to convert to float.
+        # This must raise a clean ValueError, not an uncaught OverflowError.
+        with pytest.raises(ValueError, match="too large to represent as a float"):
+            self._exec("2 ** 3999")