Class Width Calculator
Class width for a frequency table from the range of data and the number of classes.
Compare Your Options And Get Clear Answers
Class width for a frequency table from the range of data and the number of classes.
Class Width Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Class Quick Guide
Typical values for reference.
| Max | Min | Classes | Width |
|---|---|---|---|
| 100 | 0 | 10 | 10 |
| 98 | 41 | 7 | 9 |
| 250 | 10 | 8 | 30 |
| 1000 | 100 | 9 | 100 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Class Width Calculator FAQ
Answers to common questions about this calculator.
Divide the range by the number of classes and round up.
Usually 5-15; Sturges rule suggests 1 + 3.322 log n.
Class width = (max – min) / number of classes, rounded up.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.