THE NUMBERS, EXPLAINED
How to use this calculator.
Tests supplied control center points against one rectangular user-chosen reach zone, inclusively. No universal reachability, disability or ergonomic inference is made.
Start with your inputs
Enter control center x-coordinates (css pixels), control center y-coordinates (css pixels), viewport width (css pixels), viewport height (css pixels), chosen reach-zone left edge (css pixels), chosen reach-zone top edge (css pixels), chosen reach-zone right edge (css pixels), chosen reach-zone bottom edge (css pixels). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Control center x-coordinates (CSS pixels) | 20,80,150 |
| Control center y-coordinates (CSS pixels) | 20,80,150 |
| Viewport width (CSS pixels) | 200 |
| Viewport height (CSS pixels) | 200 |
| Chosen reach-zone left edge (CSS pixels) | 0 |
| Chosen reach-zone top edge (CSS pixels) | 0 |
| Chosen reach-zone right edge (CSS pixels) | 100 |
| Chosen reach-zone bottom edge (CSS pixels) | 100 |
A worked example
With the example inputs above, control rows inside chosen zone is 1, 2. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Control rows inside chosen zone | 1, 2 |
| Control rows outside chosen zone | 3 |
| Share inside chosen zone (%) | 66.666667 |
How this is calculated
Control rows inside chosen zone
Check both coordinates against the selected rectangle.
Control rows outside chosen zone
List points outside any zone edge.
Share inside chosen zone (%)
Divide included control centers by all supplied controls.
Symbols and units
- a
- Control center x-coordinates (CSS pixels)
- b
- Control center y-coordinates (CSS pixels)
- c
- Viewport width (CSS pixels)
- d
- Viewport height (CSS pixels)
- e
- Chosen reach-zone left edge (CSS pixels)
- f
- Chosen reach-zone top edge (CSS pixels)
- g
- Chosen reach-zone right edge (CSS pixels)
- h
- Chosen reach-zone bottom edge (CSS pixels)
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
Tests supplied control center points against one rectangular user-chosen reach zone, inclusively. No universal reachability, disability or ergonomic inference is made.
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?
Control rows inside chosen zone; Control rows outside chosen zone; Share inside chosen zone (%). 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: Tests supplied control center points against one rectangular user-chosen reach zone, inclusively. No universal reachability, disability or ergonomic inference is made.
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
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 →