diff --git a/matsim/calibration/constraints.py b/matsim/calibration/constraints.py
index 240ef51..0efb04b 100644
--- a/matsim/calibration/constraints.py
+++ b/matsim/calibration/constraints.py
@@ -19,3 +19,11 @@ def negative(param, val):
 def zero(param, val):
     """  A parameter is always 0 """
     return 0
+
+
+def bounds(lower: float = float('-inf'), upper: float = float('inf')) -> F:
+    """ A parameter is bound by lower and upper value """
+    def f(param, val):
+        return max(lower, min(upper, val))
+
+    return f