Formula
- 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.
- Ideal Euclidean geometry. Use one consistent length unit. Measurements and derived quantities use floating-point arithmetic. One layout: base centered, four side panels around it, lid beyond a width-side panel. Bounding dimensions refer to this layout only. No cut drawing, tabs, overlap, thickness or waste allowance.
Example Calculation
- Length: 4 units
- Width: 3 units
- Height: 2 units
A 4×3×2 box needs net area 52; the specified cross arrangement occupies a bounding rectangle 8×10.
Frequently asked questions
How do I use this calculator?
Enter length, width, height. The result updates automatically. Use Reset to restore the example values.
What method does it use?
closed material area=2(lw+lh+wh); cross-net bounds=(l+2h) by (2w+2h).. Ideal Euclidean geometry. Use one consistent length unit. Measurements and derived quantities use floating-point arithmetic. One layout: base centered, four side panels around it, lid beyond a width-side panel. Bounding dimensions refer to this layout only. No cut drawing, tabs, overlap, thickness or waste allowance.
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.