diff --git a/src/include/units/physical/dimensions.h b/src/include/units/physical/dimensions.h
index be264f48..eaec5174 100644
--- a/src/include/units/physical/dimensions.h
+++ b/src/include/units/physical/dimensions.h
@@ -119,6 +119,9 @@ struct dim_magnetic_flux : derived_dimension<Child, U, exp<B, 1>, exp<A, 1>> {};
 template<typename Child, Unit U, DimensionOf<dim_magnetic_flux> F, DimensionOf<dim_electric_current> I>
 struct dim_inductance : derived_dimension<Child, U, exp<F, 1>, exp<I, -1>> {};
 
+template<typename Child, Unit U, DimensionOf<dim_resistance> R>
+struct dim_conductance : derived_dimension<Child, U, exp<R, -1>> {};
+
 }  // namespace physical
 
 template<typename T>
@@ -193,4 +196,7 @@ concept MagneticFlux = physical::QuantityOf<T, physical::dim_magnetic_flux>;
 template <typename T>
 concept Inductance = physical::QuantityOf<T, physical::dim_inductance>;
 
+template <typename T>
+concept Conductance = physical::QuantityOf<T, physical::dim_inductance>;
+
 }  // namespace units
diff --git a/src/include/units/physical/si/conductance.h b/src/include/units/physical/si/conductance.h
new file mode 100644
index 00000000..44ca2021
--- /dev/null
+++ b/src/include/units/physical/si/conductance.h
@@ -0,0 +1,63 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+#include <units/physical/dimensions.h>
+#include <units/physical/si/resistance.h>
+#include <units/physical/si/prefixes.h>
+#include <units/quantity.h>
+
+namespace units::si {
+
+struct siemens : named_unit<siemens, {"S", "siemens"}, prefix> {};
+struct millisiemens : prefixed_unit<millisiemens, milli, siemens> {};
+struct microsiemens : prefixed_unit<microsiemens, micro, siemens> {};
+struct nanosiemens : prefixed_unit<nanosiemens, nano, siemens> {};
+
+struct dim_conductance : physical::dim_conductance<dim_conductance, siemens, dim_resistance> {};
+
+template<Unit U, Scalar Rep = double>
+using conductance = quantity<dim_conductance, U, Rep>;
+
+inline namespace literals {
+
+// R
+constexpr auto operator"" q_S(unsigned long long l) { return conductance<siemens, std::int64_t>(l); }
+constexpr auto operator"" q_S(long double l) { return conductance<siemens, long double>(l); }
+
+// mS
+constexpr auto operator"" q_mS(unsigned long long l) { return conductance<millisiemens, std::int64_t>(l); }
+constexpr auto operator"" q_mS(long double l) { return conductance<millisiemens, long double>(l); }
+
+// µS
+constexpr auto operator"" q_uS(unsigned long long l) { return conductance<microsiemens, std::int64_t>(l); }
+constexpr auto operator"" q_uS(long double l) { return conductance<microsiemens, long double>(l); }
+
+// nS
+constexpr auto operator"" q_nS(unsigned long long l) { return conductance<nanosiemens, std::int64_t>(l); }
+constexpr auto operator"" q_nS(long double l) { return conductance<nanosiemens, long double>(l); }
+
+}  // namespace literals
+
+}  // namespace units::si
+
diff --git a/test/unit_test/runtime/fmt_units_test.cpp b/test/unit_test/runtime/fmt_units_test.cpp
index 91388b8d..1b298a8e 100644
--- a/test/unit_test/runtime/fmt_units_test.cpp
+++ b/test/unit_test/runtime/fmt_units_test.cpp
@@ -42,6 +42,7 @@
 #include "units/physical/si/magnetic_induction.h"
 #include "units/physical/si/magnetic_flux.h"
 #include "units/physical/si/inductance.h"
+#include "units/physical/si/conductance.h"
 #include "units/format.h"
 #include <catch2/catch.hpp>
 
@@ -222,6 +223,12 @@ TEST_CASE("fmt::format on synthesized unit symbols", "[text][fmt]")
     CHECK(fmt::format("{}", 1q_mH) == "1 mH");
   }
 
+  SECTION("conductance")
+  {
+    CHECK(fmt::format("{}", 1q_S) == "1 S");
+    CHECK(fmt::format("{}", 1q_nS) == "1 nS");
+  }
+
   SECTION("addition with common ratio")
   {
     CHECK(fmt::format("{}", 1q_in + 1q_yd) == "37 in");
diff --git a/test/unit_test/static/si_test.cpp b/test/unit_test/static/si_test.cpp
index dd25f042..6720b60f 100644
--- a/test/unit_test/static/si_test.cpp
+++ b/test/unit_test/static/si_test.cpp
@@ -43,6 +43,7 @@
 #include <units/physical/si/magnetic_induction.h>
 #include <units/physical/si/magnetic_flux.h>
 #include <units/physical/si/inductance.h>
+#include <units/physical/si/conductance.h>
 #include <utility>
 
 namespace {
@@ -225,6 +226,16 @@ static_assert(microhenry::symbol == basic_symbol_text("µH", "uH"));
 static_assert(nanohenry::symbol == "nH");
 static_assert(picohenry::symbol == "pH");
 
+// conductance
+
+static_assert(1q_S * 1q_R == 1);
+static_assert(1q_S == 1q_A / 1q_V);
+static_assert(1q_W == 1q_A * 1q_A / 1q_S);
+
+static_assert(millisiemens::symbol == "mS");
+static_assert(microsiemens::symbol == basic_symbol_text("µS", "uS"));
+static_assert(nanosiemens::symbol == "nS");
+
 /* ************** DERIVED DIMENSIONS IN TERMS OF BASE UNITS **************** */
 
 // velocity