STANLEY PowerLock 33-425
A 25-foot locking tape measure for checking physical project dimensions.
Compatibility notes
This model uses feet and inches; convert readings carefully when your project uses millimetres.
Files stay on your device
Free. No account needed.Rectangle calculator
Find a rectangle’s area, perimeter and diagonal.
Optional equipment
If your numbers describe a physical project, use suitable measuring equipment. Check its range, units and required precision.
You do not need to buy anything to use this free tool.
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Result
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How it works
- Enter positive width and height using one consistent length unit.
- Calculate to obtain area, perimeter and the corner-to-corner diagonal.
- Check that a 6 by 8 rectangle has diagonal 10 and area 48 square units; diagonal is not perimeter.
Example & practical use
A 6 × 8 rectangle has area 48 and diagonal 10.
Limits and help
Results use floating-point arithmetic; verify precision for critical work.
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Troubleshooting
Check the unit for each field. Use a decimal point without thousands separators in numeric fields. A blank value is not the same as zero. Verify important results independently.