diff --git a/blueprints/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/__init__.py b/blueprints/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/__init__.py
new file mode 100644
index 00000000..9dc81d02
--- /dev/null
+++ b/blueprints/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/__init__.py
@@ -0,0 +1 @@
+"""Module containing all formulas from 1993-1-1+C2+A1:2016: Chapter 6 - Ultimate limit state."""
diff --git a/blueprints/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/formula_6_5.py b/blueprints/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/formula_6_5.py
new file mode 100644
index 00000000..79f10ea5
--- /dev/null
+++ b/blueprints/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/formula_6_5.py
@@ -0,0 +1,43 @@
+"""Formula 6.5 from NEN-EN 1993-1-1+C2+A1:2016: Chapter 6 - Ultimate limit state."""
+# pylint: disable=arguments-differ
+from blueprints.codes.eurocode.nen_en_1993_1_1_c2_a1_2016 import NEN_EN_1993_1_1_C2_A1_2016
+from blueprints.codes.formula import Formula
+from blueprints.type_alias import KN, RATIO
+from blueprints.validations import raise_if_less_or_equal_to_zero, raise_if_negative
+
+
+class Form6Dot5UnityCheckTensileStrength(Formula):
+    """Class representing formula 6.5 for the unity check for tensile strength."""
+
+    label = "6.5"
+    source_document = NEN_EN_1993_1_1_C2_A1_2016
+
+    def __init__(
+        self,
+        n_ed: KN,
+        n_t_rd: KN,
+    ) -> None:
+        """[N_ed/N_t_rd] Unity check for tensile strength of an element in tension.
+
+        NEN-EN 1993-1-1+C2+A1:2016 art.6.2.3(1) - Formula (6.5)
+
+        Parameters
+        ----------
+        n_ed : KN
+            [NEd] Design value of the normal tensile force [kN].
+        n_t_rd : KN
+            [Nt,Rd] Design value of the resistance against tenslie force [kN].
+        """
+        super().__init__()
+        self.n_ed = n_ed
+        self.n_t_rd = n_t_rd
+
+    @staticmethod
+    def _evaluate(
+        n_ed: KN,
+        n_t_rd: KN,
+    ) -> RATIO:
+        """Evaluates the formula, for more information see the __init__ method."""
+        raise_if_less_or_equal_to_zero(n_t_rd=n_t_rd)
+        raise_if_negative(n_ed=n_ed)
+        return n_ed / n_t_rd
diff --git a/docs/source/codes/eurocode/ec3_1993_1_1_2016/formulas.md b/docs/source/codes/eurocode/ec3_1993_1_1_2016/formulas.md
index 9b5b41c8..570fb870 100644
--- a/docs/source/codes/eurocode/ec3_1993_1_1_2016/formulas.md
+++ b/docs/source/codes/eurocode/ec3_1993_1_1_2016/formulas.md
@@ -29,7 +29,7 @@ Total of 108 equations present.
 | 6.2             | :x:  |         |             |
 | 6.3             | :x:  |         |             |
 | 6.4             | :x:  |         |             |
-| 6.5             | :x:  |         |             |
+| 6.5             | :heavy_check_mark: |         | Form6Dot5UnityCheckTensileStrength |
 | 6.6             | :x:  |         |             |
 | 6.7             | :x:  |         |             |
 | 6.8             | :x:  |         |             |
diff --git a/tests/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/__init__.py b/tests/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/__init__.py
new file mode 100644
index 00000000..1ec97fa0
--- /dev/null
+++ b/tests/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/__init__.py
@@ -0,0 +1 @@
+"""Module containing all formulas from NEN_EN_1993_1_1_C2_A1_2016: Chapter 6 - Ultimate limit state."""
diff --git a/tests/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/test_formula_6_5.py b/tests/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/test_formula_6_5.py
new file mode 100644
index 00000000..41014c8a
--- /dev/null
+++ b/tests/codes/eurocode/nen_en_1993_1_1_c2_a1_2016/chapter_6_ultimate_limit_state/test_formula_6_5.py
@@ -0,0 +1,46 @@
+"""Testing formula 6.5 of NEN-EN 1993-1-1+C2+A1:2016."""
+import pytest
+
+from blueprints.codes.eurocode.nen_en_1993_1_1_c2_a1_2016.chapter_6_ultimate_limit_state.formula_6_5 import (
+    Form6Dot5UnityCheckTensileStrength,
+)
+from blueprints.validations import LessOrEqualToZeroError, NegativeValueError
+
+
+class TestForm6Dot5UnityCheckTensileStrength:
+    """Validation for formula 6.5 from NEN-EN 1993-1-1+C2+A1:2016."""
+
+    def test_evaluation(self) -> None:
+        """Test the evaluation of the result."""
+        # Example values
+        n_ed = 7  # kN
+        n_t_rd = 10  # kN
+        form = Form6Dot5UnityCheckTensileStrength(n_ed=n_ed, n_t_rd=n_t_rd)
+
+        # Expected result, manually calculated
+        expected = 0.7
+
+        assert form == pytest.approx(expected)
+
+    @pytest.mark.parametrize(
+        ("n_ed", "n_t_rd"),
+        [
+            (-7, 10),  # n_ed is negative
+        ],
+    )
+    def test_raise_error_when_negative_n_ed_is_given(self, n_ed: float, n_t_rd: float) -> None:
+        """Test a negative value for n_ed."""
+        with pytest.raises(NegativeValueError):
+            Form6Dot5UnityCheckTensileStrength(n_ed=n_ed, n_t_rd=n_t_rd)
+
+    @pytest.mark.parametrize(
+        ("n_ed", "n_t_rd"),
+        [
+            (7, 0),  # n_ed is negative
+            (7, -10),  # n_t_rd is negative
+        ],
+    )
+    def test_raise_error_when_negative_or_zero_n_t_rd_is_given(self, n_ed: float, n_t_rd: float) -> None:
+        """Test a zero value for n_t_rd."""
+        with pytest.raises(LessOrEqualToZeroError):
+            Form6Dot5UnityCheckTensileStrength(n_ed=n_ed, n_t_rd=n_t_rd)