diff --git a/example/unmanned_aerial_vehicle.cpp b/example/unmanned_aerial_vehicle.cpp
index bfcf536d..cfb81092 100644
--- a/example/unmanned_aerial_vehicle.cpp
+++ b/example/unmanned_aerial_vehicle.cpp
@@ -149,7 +149,7 @@ public:
   void current(msl_altitude alt) { current_ = alt; }
   [[nodiscard]] msl_altitude current() const { return current_; }
 
-  [[nodiscard]] hal_altitude hal() const { return height_above_launch + (current_ - launch_); }
+  [[nodiscard]] hal_altitude hal() const { return height_above_launch + current_.quantity_from(launch_); }
 };
 
 
@@ -164,7 +164,7 @@ int main()
   std::cout << MP_UNITS_STD_FMT::format("hal = {::N[.2f]}\n", uav.hal());
 
   const msl_altitude ground_level = mean_sea_level + 123 * m;
-  std::cout << MP_UNITS_STD_FMT::format("agl = {::N[.2f]}\n", uav.current() - ground_level);
+  std::cout << MP_UNITS_STD_FMT::format("agl = {::N[.2f]}\n", uav.current().quantity_from(ground_level));
 
   struct waypoint {
     std::string name;
diff --git a/src/core/include/mp-units/framework/quantity_point.h b/src/core/include/mp-units/framework/quantity_point.h
index d148e07a..a121feb7 100644
--- a/src/core/include/mp-units/framework/quantity_point.h
+++ b/src/core/include/mp-units/framework/quantity_point.h
@@ -256,6 +256,12 @@ public:
     return *this - PO2{};
   }
 
+  template<QuantityPointOf<absolute_point_origin> QP>
+  [[nodiscard]] constexpr Quantity auto quantity_from(const QP& qp) const
+  {
+    return *this - qp;
+  }
+
   [[nodiscard]] constexpr Quantity auto quantity_from_zero() const
   {
     if constexpr (requires { unit.point_origin; }) {
diff --git a/test/static/quantity_point_test.cpp b/test/static/quantity_point_test.cpp
index b3ff307f..aa91ab8e 100644
--- a/test/static/quantity_point_test.cpp
+++ b/test/static/quantity_point_test.cpp
@@ -1439,6 +1439,17 @@ static_assert((ground_level + 42 * m) - (other_ground_level + 42 * m) == -81 * m
 static_assert((other_ground_level + 42 * m) - (tower_peak + 42 * m) == 39 * m);
 static_assert((tower_peak + 42 * m) - (other_ground_level + 42 * m) == -39 * m);
 
+static_assert((mean_sea_level + 42 * m).quantity_from(ground_level + 42 * m) == -42 * m);
+static_assert((ground_level + 42 * m).quantity_from(mean_sea_level + 42 * m) == 42 * m);
+static_assert((tower_peak + 42 * m).quantity_from(ground_level + 42 * m) == 42 * m);
+static_assert((ground_level + 42 * m).quantity_from(tower_peak + 42 * m) == -42 * m);
+static_assert((tower_peak + 42 * m).quantity_from(mean_sea_level + 42 * m) == 84 * m);
+static_assert((mean_sea_level + 42 * m).quantity_from(tower_peak + 42 * m) == -84 * m);
+static_assert((other_ground_level + 42 * m).quantity_from(ground_level + 42 * m) == 81 * m);
+static_assert((ground_level + 42 * m).quantity_from(other_ground_level + 42 * m) == -81 * m);
+static_assert((other_ground_level + 42 * m).quantity_from(tower_peak + 42 * m) == 39 * m);
+static_assert((tower_peak + 42 * m).quantity_from(other_ground_level + 42 * m) == -39 * m);
+
 static_assert((mean_sea_level + 42 * m).quantity_from(mean_sea_level) == 42 * m);
 static_assert((42 * m + mean_sea_level).quantity_from(mean_sea_level) == 42 * m);
 static_assert((mean_sea_level - 42 * m).quantity_from(mean_sea_level) == -42 * m);