Examples
Examples
Try the starting example
- Measured foot length (mm)
- 265
- Extra length explicitly required by your chart (mm)
- 0
- Brand chart: brand, size label, minimum mm, maximum mm
- A,42,260,270 A,43,270,280 B,9,265,275
- Matching brand-size labels
- A 42, B 9
- Brands with multiple matching sizes
- None
- Matches exactly on an inclusive chart boundary
- B 9
- Matching chart rows
- 2
Try another scenario
- Measured foot length (mm)
- 270
- Extra length explicitly required by your chart (mm)
- 0
- Brand chart: brand, size label, minimum mm, maximum mm
- A,42,260,270 A,43,270,280 B,9,265,275
- Matching brand-size labels
- A 42, A 43, B 9
- Brands with multiple matching sizes
- A
- Matches exactly on an inclusive chart boundary
- A 42, A 43
- Matching chart rows
- 3
Calculation method
Calculation method
Matching brand-size labels
Compare measured length + supplied extra length with each entered inclusive interval.
Brands with multiple matching sizes
List brands with two or more matching size labels rather than selecting one silently.
Matches exactly on an inclusive chart boundary
List matched rows equal to either entered boundary.
Matching chart rows
Number of matching rows; no universal size conversion is inferred.
Symbols and units
- a
- Measured foot length (mm)
- b
- Extra length explicitly required by your chart (mm)
- c
- Brand chart: brand, size label, minimum mm, maximum mm
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Compares user-supplied brand charts only. Chart boundaries are inclusive, so a boundary can match adjacent sizes. Width, last shape, socks, fit preference and brand advice remain outside this length-only lookup.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
OpenStax: arithmetic and geometry ↗
Background reading; this does not imply endorsement or independent review of SumFizz.