diff --git a/library/include/mobilisis/calculator_functions.h b/library/include/mobilisis/calculator_functions.h
index b006b61..4788c90 100644
--- a/library/include/mobilisis/calculator_functions.h
+++ b/library/include/mobilisis/calculator_functions.h
@@ -80,7 +80,13 @@ private:
 
     //
     uint32_t GetPriceForTimeStep(Configuration *cfg, int timeStep) const;
+    uint32_t GetPriceForStep(Configuration *cfg, int step) const {
+        return GetPriceForTimeStep(cfg, step);
+    }
     uint32_t GetDurationForPrice(Configuration *cfg, int price) const;
+    uint32_t GetStepForPrice(Configuration *cfg, int price) const {
+        return GetDurationForPrice(cfg, price);
+    }
 
     int findWorkTimeRange(QDateTime const &dt,
                           QScopedArrayPointer<TariffTimeRange> const &worktime,