diff --git a/profiler_gui/arbitrary_value_inspector.cpp b/profiler_gui/arbitrary_value_inspector.cpp
index 89e6620..a2e90e2 100644
--- a/profiler_gui/arbitrary_value_inspector.cpp
+++ b/profiler_gui/arbitrary_value_inspector.cpp
@@ -77,6 +77,7 @@
 #include "arbitrary_value_inspector.h"
 #include "treeview_first_column_delegate.h"
 #include "globals.h"
+#include "easy_complexity_calculator.h"
 
 //////////////////////////////////////////////////////////////////////////
 
diff --git a/profiler_gui/arbitrary_value_inspector.h b/profiler_gui/arbitrary_value_inspector.h
index 36b5daa..6989595 100644
--- a/profiler_gui/arbitrary_value_inspector.h
+++ b/profiler_gui/arbitrary_value_inspector.h
@@ -95,18 +95,6 @@ enum class FilterType : uint8_t
     Median,
 };
 
-enum class ComplexityType : uint8_t
-{
-    Constant = 0, ///< O(1)
-    Logarithmic,  ///< O(logN)
-    Linear,       ///< O(N)
-    Quasilinear,  ///< O(N*logN)
-    Quadratic,    ///< O(N^2)
-    Cubic,        ///< O(N^3)
-    Exponential,  ///< O(2^N)
-    Factorial,    ///< O(N!)
-};
-
 enum class ChartPenStyle : uint8_t
 {
     Line = 0,
diff --git a/profiler_gui/easy_complexity_calculator.h b/profiler_gui/easy_complexity_calculator.h
new file mode 100644
index 0000000..51d1dc0
--- /dev/null
+++ b/profiler_gui/easy_complexity_calculator.h
@@ -0,0 +1,126 @@
+/**
+Lightweight profiler library for c++
+Copyright(C) 2016-2018  Sergey Yagovtsev, Victor Zarubkin
+
+Licensed under either of
+    * MIT license (LICENSE.MIT or http://opensource.org/licenses/MIT)
+    * Apache License, Version 2.0, (LICENSE.APACHE or http://www.apache.org/licenses/LICENSE-2.0)
+at your option.
+
+The MIT License
+    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.
+
+
+The Apache License, Version 2.0 (the "License");
+    You may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+**/
+
+#ifndef EASY_COMPLEXITY_CALCULATOR_H
+#define EASY_COMPLEXITY_CALCULATOR_H
+
+#include <map>
+#include <vector>
+#include <functional>
+#include <cmath>
+#include <numeric>
+
+enum class ComplexityType : uint8_t
+{
+    Constant = 0, ///< O(1)
+    Logarithmic,  ///< O(logN)
+    Linear,       ///< O(N)
+    Quasilinear,  ///< O(N*logN)
+    Quadratic,    ///< O(N^2)
+    Cubic,        ///< O(N^3)
+    Exponential,  ///< O(2^N)
+    Factorial,    ///< O(N!)
+    Unknown,      ///< cannot estimate
+};
+
+template<class TValue>
+TValue getAverage(const std::vector<TValue>& derivatives) {
+    TValue result = std::accumulate(derivatives.begin(), derivatives.end(), TValue(0.0), [](TValue a, TValue b){
+        if(std::isnormal(b)) {
+            return a + b;
+        }
+        return a;
+    });
+    return result / TValue(derivatives.size());
+}
+
+template<class TKey, class TValue>
+std::vector<TValue> calculateDerivatives(const std::map<TKey, TValue>& input_array) {
+    std::vector<TValue> result;
+    for(auto it = input_array.cbegin(), next_it = input_array.cbegin()++; next_it != input_array.cend();it = next_it, ++next_it) {
+        auto x0 = it->first;
+        auto x1 = next_it->first;
+
+        auto y0 = it->second;
+        auto y1 = next_it->second;
+
+        result.push_back((y1-y0)/(x1-x0));
+    }
+    return result;
+}
+
+template<class TKey, class TValue>
+std::map<TValue, TValue> getLogarithmicChart(const std::map<TKey, std::vector<TValue> >& input) {
+    std::map<TValue, TValue> result;
+    for(auto it: input) {
+        result[static_cast<TValue>(std::log2(it.first))] = std::log2(getAverage(it.second));
+    }
+    return result;
+}
+
+template <class TKey, class TValue>
+ComplexityType estimateComplexity(const std::map<TKey, std::vector<TValue> >& input) {
+    auto average = getAverage(calculateDerivatives(getLogarithmicChart(input)));
+
+    double estimate_angle = std::atan(double(average))*57.3;
+    if(estimate_angle < 1.0) {
+        return ComplexityType::Constant;
+    }else if (estimate_angle < 10.0) {
+        return ComplexityType::Logarithmic;
+    }else if (estimate_angle < 30.0) {
+        return ComplexityType::Linear;
+    }else if (estimate_angle < 50.0) {
+        return ComplexityType::Quasilinear;
+    }else if (estimate_angle < 65.0) {
+        return ComplexityType::Quadratic;
+    }else if (estimate_angle < 70.0) {
+        return ComplexityType::Cubic;
+    }else if (estimate_angle < 85.0) {
+        return ComplexityType::Exponential;
+    }else{
+        return ComplexityType::Factorial;
+    }
+
+    return ComplexityType::Unknown;
+}
+
+#endif