Calculator for Rounding to Exactly 100 Percent
Sum Conserving Rounding
When rounding numbers errors can occur, rounding errors. If you have different values that add up to 100 percent, the rounded values may add up to slightly more or less than 100 percent. Rounded values are corrected here so that the total is 100 percent again. If the percentage sum was too low, then the first of the highest values of the difference between the unrounded and the rounded value are increased by one at the last decimal place. If the percentage sum was too high, it will be reduced accordingly.
As an example, enter 1, 1 and 1 as three values (at no. 1. - 3.). Each value corresponds to 33.33% of the whole, together 99.99%. Corrected, the first value gets 33.34%, together 100%. Favoring one value over the others based on order alone is an inevitable downside of this fix.
Please enter up to ten or twenty numbers in the Values column, select the number of decimal places and click Determine percentages. Do not leave gaps at the beginning or in the middle of the values. The percentages and the sums (Σ) are calculated. A corrected value is highlighted in red.