diff --git a/trick_source/trick_utils/units/include/constant.h b/trick_source/trick_utils/units/include/constant.h
index 2d4d70b1..b18f6660 100644
--- a/trick_source/trick_utils/units/include/constant.h
+++ b/trick_source/trick_utils/units/include/constant.h
@@ -15,14 +15,14 @@ PROGRAMMERS:
 #define MTOIN     (39.370079)           /* meters to inches             */
 #define FTOM      (0.3048)              /* feet to meters               */
 #define NMTOM     (1852.0)              /* nautical miles to meters     */
-#define MTF       (3.28083989501312336) /* meters to feet               */
+#define MTF       (3.28084)             /* meters to feet               */
 #define LBFTON    (4.4482216152605)     /* pound-force to newtons       */
-#define LBTOKG    (0.4535923697760192)  /* pound-mass to kilograms      */
+#define LBTOKG    (0.45359237)          /* pound-mass to kilograms      */
 #define SLFTOKGM  (1.355817947661907)   /* slug-ft**2 to kilogram-m**2  */
-#define KGTOLB    (2.204622622937404)   /* kilograms to pound-mass      */
+#define KGTOLB    (2.20462262185)       /* kilograms to pound-mass      */
 #define NMTOFP    (0.7375621492772654)  /* newton-meters to foot-pounds */
-#define SLTOLB    (32.17404855643046)   /* slugs to pounds              */
-#define SLTOKG    (14.5939029372064)    /* slugs to kilograms           */
+#define SLTOLB    (32.174049)           /* slugs to pounds              */
+#define SLTOKG    (14.59390)            /* slugs to kilograms           */
 
 
 #endif