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Determine the Number of Pieces to Mail

The following calculator will determine the number of pieces you must mail on your next mailing in order to gain confidence that you can repeat the result on future mailings.

Click here for a detailed description of this calculator.

Percentage of Decline

Confidence

Level

50% 25% 12.5% 6.5%

75%

85%

90%

95%

99%

Enter the anticipated response rate you expect from your mailing: %

DISCLAIMER: "I acknowledge that the use of statistical analysis is not a guarantee of actual or predicted results. Accordingly, I understand that Edith Roman Associates, Inc. does not warrant or guarantee the results of any mailing made using this calculator or it's use for any other purposes."

1% = 1.00 or 1
2.267% = 2.267

How to use this calculator:
The table helps determine how many pieces must be mailed to get a statistically valid test result. There are two factors to consider: percent of decline (top line) and confidence level (first vertical column at left). Many mailers prefer testing at an 85 percent confidence level with a 12.5 percent decline.

Confidence Level - the percentage of time that a result can be expected to occur.
Percentage of Decline - the percent that an original result can vary on subsequent mailings.

If you have any further questions or comments about this calculator, please contact Edith Roman Associates.