THE NUMBERS, EXPLAINED
How to use this calculator.
Sleeves use the same shoulder datum; existing hems are opened before cutting. Only shortening is supported.
Start with your inputs
Enter left sleeve length (cm), right sleeve length (cm), desired finished length (cm), new hem allowance (cm). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Left sleeve length (cm) | 64 |
| Right sleeve length (cm) | 63 |
| Desired finished length (cm) | 60 |
| New hem allowance (cm) | 2 |
A worked example
With the example inputs above, left finished shortening (cm) is 4. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Left finished shortening (cm) | 4 |
| Right finished shortening (cm) | 3 |
| Left and right cut removal (cm) | 2, 1 |
| Existing sleeve mismatch (cm) | 1 |
How this is calculated
Left finished shortening (cm)
Subtract desired length from current left length.
Right finished shortening (cm)
Subtract desired length from current right length.
Left and right cut removal (cm)
Reserve the new hem allowance when determining removed cloth.
Existing sleeve mismatch (cm)
Subtract right measured length from left.
Symbols and units
- a
- Left sleeve length (cm)
- b
- Right sleeve length (cm)
- c
- Desired finished length (cm)
- d
- New hem allowance (cm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Sleeves use the same shoulder datum; existing hems are opened before cutting. Only shortening is supported.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Left finished shortening (cm); Right finished shortening (cm); Left and right cut removal (cm); Existing sleeve mismatch (cm). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Sleeves use the same shoulder datum; existing hems are opened before cutting. Only shortening is supported.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Solve proportions and their applications ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →