diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/BaseCalendar.java b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/BaseCalendar.java
index 5134612c8..676c25a2b 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/BaseCalendar.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/BaseCalendar.java
@@ -32,6 +32,7 @@ import org.joda.time.DateTimeConstants;
 import org.joda.time.LocalDate;
 import org.navalplanner.business.calendars.entities.CalendarData.Days;
 import org.navalplanner.business.common.BaseEntity;
+import org.navalplanner.business.planner.entities.ResourcesPerDay;
 
 /**
  * Represents a calendar with some exception days. A calendar is valid till the
@@ -258,6 +259,10 @@ public class BaseCalendar extends BaseEntity implements IWorkHours {
      * calendar restrictions.
      */
     public Integer getCapacityAt(LocalDate date) {
+        return getWorkableHours(date);
+    }
+
+    private Integer getWorkableHours(LocalDate date) {
         CalendarException exceptionDay = getExceptionDay(date);
         if (exceptionDay != null) {
             return exceptionDay.getHours();
@@ -774,4 +779,10 @@ public class BaseCalendar extends BaseEntity implements IWorkHours {
         calendarAvailability.setEndDate(endDate);
     }
 
+    @Override
+    public Integer toHours(LocalDate day, ResourcesPerDay resourcesPerDay) {
+        final Integer workableHours = getWorkableHours(day);
+        return resourcesPerDay.asHoursGivenResourceWorkingDayOf(workableHours);
+    }
+
 }
\ No newline at end of file
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CombinedWorkHours.java b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CombinedWorkHours.java
index 4a5843bb9..041bf2a62 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CombinedWorkHours.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CombinedWorkHours.java
@@ -25,6 +25,7 @@ import java.util.List;
 
 import org.apache.commons.lang.Validate;
 import org.joda.time.LocalDate;
+import org.navalplanner.business.planner.entities.ResourcesPerDay;
 
 public abstract class CombinedWorkHours implements IWorkHours {
 
@@ -52,6 +53,22 @@ public abstract class CombinedWorkHours implements IWorkHours {
         return current;
     }
 
+    @Override
+    public Integer toHours(LocalDate day, ResourcesPerDay amount) {
+        Integer current = null;
+        for (IWorkHours each : workHours) {
+            current = current == null ? initialHours(each, day, amount)
+                    : updateHours(current, each, day, amount);
+        }
+        return current;
+    }
+
+    protected abstract Integer updateHours(Integer current,
+            IWorkHours workHours, LocalDate day, ResourcesPerDay amount);
+
+    protected abstract Integer initialHours(IWorkHours workHours,
+            LocalDate day, ResourcesPerDay amount);
+
     protected abstract Integer capacity(IWorkHours workHour, LocalDate date);
 
     protected abstract Integer updateCapacity(Integer current,
@@ -75,4 +92,17 @@ class Min extends CombinedWorkHours {
     protected Integer capacity(IWorkHours workHour, LocalDate date) {
         return workHour.getCapacityAt(date);
     }
+
+    @Override
+    protected Integer initialHours(IWorkHours workHours, LocalDate day,
+            ResourcesPerDay amount) {
+        return workHours.toHours(day, amount);
+    }
+
+    @Override
+    protected Integer updateHours(Integer current, IWorkHours workHours,
+            LocalDate day, ResourcesPerDay amount) {
+        return Math.min(workHours.toHours(day, amount), current);
+    }
+
 }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/IWorkHours.java b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/IWorkHours.java
index 9384fc033..cd689b7ab 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/IWorkHours.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/IWorkHours.java
@@ -21,9 +21,19 @@
 package org.navalplanner.business.calendars.entities;
 
 import org.joda.time.LocalDate;
+import org.navalplanner.business.planner.entities.ResourcesPerDay;
 
 public interface IWorkHours {
 
+    /**
+     * Translates the received amount into the corresponding hours at the given
+     * date
+     * @param day
+     * @param amount
+     * @return
+     */
+    public Integer toHours(LocalDate day, ResourcesPerDay amount);
+
     /**
      * Calculates the capacity at a given date. It means all the hours that
      * could be worked without having overtime
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/SameWorkHoursEveryDay.java b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/SameWorkHoursEveryDay.java
index 2fa5269dd..1986085c4 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/SameWorkHoursEveryDay.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/SameWorkHoursEveryDay.java
@@ -22,6 +22,7 @@ package org.navalplanner.business.calendars.entities;
 
 import org.apache.commons.lang.Validate;
 import org.joda.time.LocalDate;
+import org.navalplanner.business.planner.entities.ResourcesPerDay;
 
 public class SameWorkHoursEveryDay implements IWorkHours {
 
@@ -44,4 +45,9 @@ public class SameWorkHoursEveryDay implements IWorkHours {
         return hours;
     }
 
+    @Override
+    public Integer toHours(LocalDate day, ResourcesPerDay amount) {
+        return amount.asHoursGivenResourceWorkingDayOf(getCapacityAt(day));
+    }
+
 }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
index 0d6179571..876d0423c 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
@@ -486,6 +486,12 @@ public abstract class ResourceAllocation<T extends DayAssignment> extends
                     return getTaskCalendar().getCapacityAt(day);
                 }
             }
+
+            @Override
+            public Integer toHours(LocalDate day, ResourcesPerDay amount) {
+                final Integer capacity = getCapacityAt(day);
+                return amount.asHoursGivenResourceWorkingDayOf(capacity);
+            }
         };
     }