diff --git a/src/exponent.c b/src/exponent.c
index 8909d56..2e0d5b3 100644
--- a/src/exponent.c
+++ b/src/exponent.c
@@ -5,13 +5,7 @@
 #include "exponent.h"
 #include "logarithmus.h"
 #include "reihen.h"
-
-double absD(double x){
-    if(x<0){
-        return -1 * x;
-    }
-    return x;
-}
+#include "util.h"
 
 double p(double exp, double base){
     double prod = 1.0;
diff --git a/src/logarithmus.c b/src/logarithmus.c
index fa6ea62..2d440f9 100644
--- a/src/logarithmus.c
+++ b/src/logarithmus.c
@@ -4,6 +4,7 @@
 #include "logarithmus.h"
 #include "exponent.h"
 #include "reihen.h"
+#include "util.h"
 
 double logX(double base, double value){
     if(base == 1.0 || base <= 0.0 || value <= 0.0){
diff --git a/src/reihen.c b/src/reihen.c
index 649814a..e021325 100644
--- a/src/reihen.c
+++ b/src/reihen.c
@@ -5,21 +5,10 @@
 #include "reihen.h"
 #include "exponent.h"
 #include "logarithmus.h"
+#include "util.h"
 
 #define PI pi(1e-8)
 
-unsigned long long fac(int x){
-    unsigned long long prod = 1;
-    if(x==0) return 1;
-    for (int i = 1; i <= x; i++){
-        if (prod > ULLONG_MAX / i){
-            break;
-        }
-        prod*=i;
-    }
-    return prod;
-}
-
 double exponential(double exp){
     double sum = 0.0;
     for(int i = 0; i<=21; i++){
@@ -32,10 +21,6 @@ double euler(){
     return exponential(1);
 }
 
-double squashDegreesTo360(double degrees){
-    int multiple = degrees / 360;
-    return degrees - (360*multiple);
-}
 
 double radians(double degrees){
     return degrees * PI / 180;
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..6930ec9
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <limits.h>
+
+#include "util.h"
+
+double absD(double x){
+    if(x<0){
+        return -1 * x;
+    }
+    return x;
+}
+
+double squashDegreesTo360(double degrees){
+    int multiple = degrees / 360;
+    return degrees - (360*multiple);
+}
+
+unsigned long long fac(int x){
+    unsigned long long prod = 1;
+    if(x==0) return 1;
+    for (int i = 1; i <= x; i++){
+        if (prod > ULLONG_MAX / i){
+            break;
+        }
+        prod*=i;
+    }
+    return prod;
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..76eb4ba
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,8 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+double absD(double x);
+double squashDegreesTo360(double degrees);
+unsigned long long fac(int x);
+
+#endif // util.h
\ No newline at end of file
diff --git a/test/test_exponent.c b/test/test_exponent.c
index d137507..bd2fdda 100644
--- a/test/test_exponent.c
+++ b/test/test_exponent.c
@@ -5,6 +5,7 @@
 #include "exponent.h"
 #include "logarithmus.h"
 #include "reihen.h"
+#include "util.h"
 
 void setUp(void)
 {
diff --git a/test/test_logarithmus.c b/test/test_logarithmus.c
index 7c24c13..e8f8da9 100644
--- a/test/test_logarithmus.c
+++ b/test/test_logarithmus.c
@@ -5,6 +5,7 @@
 #include "logarithmus.h"
 #include "exponent.h"
 #include "reihen.h"
+#include "util.h"
 
 void setUp(void)
 {
diff --git a/test/test_reihen.c b/test/test_reihen.c
index a24ecb7..f75c8fa 100644
--- a/test/test_reihen.c
+++ b/test/test_reihen.c
@@ -5,6 +5,7 @@
 #include "reihen.h"
 #include "exponent.h"
 #include "logarithmus.h"
+#include "util.h"
 
 void setUp(void)
 {