diff -r c94edc758a5b -r fcbbddcc22c1 src/Utils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Utils.cpp	Sat Feb 19 22:17:09 2022 +0100
@@ -0,0 +1,43 @@
+/**
+ * Utils.cpp is part of bmsapp.
+ *
+ * bmsapp is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * bmsapp is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "Utils.h"
+
+#include <math.h>
+
+double Utils::Round(double n, int d)
+{
+    int m;
+
+    for (int i = 0, m = 1; i < d; i++, m *= 10);
+    return round(n * m) / m;
+}
+
+
+double Utils::lintner_to_kolbach(double lintner)
+{
+    double wk = (3.5 * lintner) - 16;
+    if (wk < 0)
+	return 0.0;
+    return wk;
+}
+
+
+double Utils::kolbach_to_lintner(double kolbach)
+{
+    return Round((kolbach + 16) / 3.5, 3);
+}
+