diff --git a/apps/tests.c b/apps/tests.c
index 0ef511d2..e6bd093b 100644
--- a/apps/tests.c
+++ b/apps/tests.c
@@ -274,6 +274,31 @@ static int join_test(void* arg)
 	return 0;
 }
 
+#ifndef M_PI
+#define M_PI	3.14159265358979323846264338327950288   /* pi */
+#endif
+
+static int pi(void* arg)
+{
+	double x, sum, step;
+	int i, num_steps = 100000000;
+
+	sum = 0.0;
+	step = 1.0 / (double)num_steps;
+
+	for (i = 0; i < num_steps; i++) {
+		x = (i + 0.5) * step;
+		sum += 4.0 / (1.0 + x * x);
+	}
+
+	x = M_PI - sum * step;
+	x *= 10000.0;
+
+	kprintf("Distance to PI = %u/10000\n", (uint32_t) x);
+
+	return 0;
+}
+
 int test_init(void)
 {
 //	char* argv[] = {"/bin/mshell", NULL};
@@ -292,6 +317,7 @@ int test_init(void)
 	//create_kernel_task(NULL, mail_ping, NULL, NORMAL_PRIO);
 	//create_kernel_task(NULL, mail_noise, NULL, NORMAL_PRIO);
 	//create_kernel_task(NULL, svm_test, NULL, NORMAL_PRIO);
+	//create_kernel_task(NULL, pi, NULL, NORMAL_PRIO);
 	//create_user_task(NULL, "/bin/hello", argv);
 	create_user_task(NULL, "/bin/tests", argv);
 	//create_user_task(NULL, "/bin/jacobi", argv);