Calculator to assess counts such as road casualty figures


Use this calculator:
  • for a single count, obtain the 95% confidence interval
  • for two counts, compare the counts by a chart, by the 95% confidence intervals (95% CIs) and by a test of statistical significance
  • for three or more counts, draw a chart with 95% confidence intervals
Use this calculator for comparing counts, but not for averages or proportions.

(For a more advanced utility for drawing charts of counts, go to charts_for_counts.php )

What to do
Enter the count(s) in the box (if more than one, separate them by commas):

Optionally enter label(s) as well (again separate by commas if more than one):

Then select 'Calculate': 		Not sure what to do?
Try these examples:







Further information