Showing percentage for pre calculated fields in Tableau. In Tableau measures sometimes displays the percentage in four digits like 3343% instead of usual max 100%. This is because the field is already calculated in database and the value for the percent is available like 3, 4, 8 etc which needs a % sign beside them like 3%, 4%,5% etc. In order to do this the simple trick is that: Go to Tableau - > Right click on the measure Click on Format for the Measure..