Index: runners/calculator/calculatorrunner.cpp
===================================================================
--- runners/calculator/calculatorrunner.cpp
+++ runners/calculator/calculatorrunner.cpp
@@ -313,10 +313,8 @@
     }
 
     //ECMAScript has issues with the last digit in simple rational computations
-    //This script rounds off the last digit; see bug 167986
-    QString roundedResultString = eng.evaluate(QStringLiteral("var exponent = 14-(1+Math.floor(Math.log(Math.abs(result))/Math.log(10)));\
-                                                var order=Math.pow(10,exponent);\
-                                                (order > 0? Math.round(result*order)/order : 0)")).toString();
+    //This script rounds to 7 of 15 digits; see bug 167986. Divide by 1 to omit trailing zeros:
+    QString roundedResultString = eng.evaluate(QStringLiteral("result.toPrecision(7)/1")).toString();
 
     roundedResultString.replace('.', QLocale().decimalPoint(), Qt::CaseInsensitive);