diff --git a/include/bx/inline/math.inl b/include/bx/inline/math.inl
index 72e4ef2..6f946e1 100644
--- a/include/bx/inline/math.inl
+++ b/include/bx/inline/math.inl
@@ -127,6 +127,11 @@ namespace bx
 		return _a + (_b - _a) * _t;
 	}
 
+	inline BX_CONSTEXPR_FUNC float invLerp(float _a, float _b, float _value)
+	{
+		return (_value - _a) / (_b - _a);
+	}
+
 	inline BX_CONSTEXPR_FUNC float sign(float _a)
 	{
 		return _a < 0.0f ? -1.0f : 1.0f;
diff --git a/include/bx/math.h b/include/bx/math.h
index a46ab0d..ebd0662 100644
--- a/include/bx/math.h
+++ b/include/bx/math.h
@@ -146,6 +146,10 @@ namespace bx
 	///
 	BX_CONSTEXPR_FUNC float lerp(float _a, float _b, float _t);
 
+	/// Returns inverse linear interpolation of _value between two values _a and _b.
+	///
+	BX_CONSTEXPR_FUNC float invLerp(float _a, float _b, float _value);
+
 	/// Returns the sign of _a.
 	///
 	BX_CONSTEXPR_FUNC float sign(float _a);