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diff --git a/src/catch2/benchmark/catch_chronometer.hpp b/src/catch2/benchmark/catch_chronometer.hpp
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+++ b/src/catch2/benchmark/catch_chronometer.hpp
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+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+// Adapted from donated nonius code.
+
+#ifndef CATCH_CHRONOMETER_HPP_INCLUDED
+#define CATCH_CHRONOMETER_HPP_INCLUDED
+
+#include <catch2/benchmark/catch_clock.hpp>
+#include <catch2/benchmark/catch_optimizer.hpp>
+#include <catch2/internal/catch_meta.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
+
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            struct ChronometerConcept {
+                virtual void start() = 0;
+                virtual void finish() = 0;
+                virtual ~ChronometerConcept(); // = default;
+
+                ChronometerConcept() = default;
+                ChronometerConcept(ChronometerConcept const&) = default;
+                ChronometerConcept& operator=(ChronometerConcept const&) = default;
+            };
+            template <typename Clock>
+            struct ChronometerModel final : public ChronometerConcept {
+                void start() override { started = Clock::now(); }
+                void finish() override { finished = Clock::now(); }
+
+                IDuration elapsed() const {
+                    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+                        finished - started );
+                }
+
+                TimePoint<Clock> started;
+                TimePoint<Clock> finished;
+            };
+        } // namespace Detail
+
+        struct Chronometer {
+        public:
+            template <typename Fun>
+            void measure(Fun&& fun) { measure(CATCH_FORWARD(fun), is_callable<Fun(int)>()); }
+
+            int runs() const { return repeats; }
+
+            Chronometer(Detail::ChronometerConcept& meter, int repeats_)
+                : impl(&meter)
+                , repeats(repeats_) {}
+
+        private:
+            template <typename Fun>
+            void measure(Fun&& fun, std::false_type) {
+                measure([&fun](int) { return fun(); }, std::true_type());
+            }
+
+            template <typename Fun>
+            void measure(Fun&& fun, std::true_type) {
+                Detail::optimizer_barrier();
+                impl->start();
+                for (int i = 0; i < repeats; ++i) invoke_deoptimized(fun, i);
+                impl->finish();
+                Detail::optimizer_barrier();
+            }
+
+            Detail::ChronometerConcept* impl;
+            int repeats;
+        };
+    } // namespace Benchmark
+} // namespace Catch
+
+#endif // CATCH_CHRONOMETER_HPP_INCLUDED