Formula
width=(upper−lower)/classes.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Continuous interval widths; no automatic +1 for discrete observations. Rounding up changes the final covered endpoint.
Example Calculation
Example inputs
- Lower bound: 10
- Upper bound: 90
- Class count: 8
Bounds 10 and 90 split into eight equal classes give width 10.
Frequently asked questions
How do I use this calculator?
Enter lower bound, upper bound, class count. The result updates automatically. Use Reset to restore the example values.
What method does it use?
width=(upper−lower)/classes.. Continuous interval widths; no automatic +1 for discrete observations. Rounding up changes the final covered endpoint.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.