How to refresh the estimate
- Change the measurement, fence type, spacing, gate, concrete, or price input you want to correct.
- Choose Calculate materials again.
- Review the refreshed result cards and the calculation notes before copying the result.
The calculator's form listens for a submit event. It does not attach a live recalculation handler to each input field. This keeps the displayed cards from changing on every keystroke, but it also means an edit alone is not a new calculation.
A controlled example
With the default 8 ft post spacing and no gates, a submitted 100 ft run returns 14 posts. If you edit the length to 104.01 ft, the displayed 14 remains until you submit again. After resubmitting, the calculator uses 14 straight-run sections plus one endpoint post, so the card changes to 15 posts.
The change follows the code's ceiling rule: ceil(100 ÷ 8) + 1 = 14, while ceil(104.01 ÷ 8) + 1 = 15. These are controlled software inputs, not a recommended physical post layout.
What to check if the refreshed output still looks unchanged
- Confirm you submitted after making the edit.
- Check whether the edited field affects the card you are watching. Some inputs affect different outputs: a price can change cost without changing material counts.
- Check the displayed units and related inputs, such as gate count together with gate width.
- Open Show calculation notes to compare the submitted run length, gate deduction, spacing, and post formula.
If the changed value is still not reflected after a fresh submission, reload the page and enter the values again. This calculator does not save a project or keep an input history, so record any values you need before leaving the page.
Source and scope
This behavior is documented from the site's current calculation handler and form in Fence Calculator: calculation runs on form submission, and the results section is updated by that handler. The worked values above are controlled software examples. They do not describe a measured property or provide construction-placement guidance.
For the post equation itself, see how Fence Calculator counts posts. For threshold behavior, see why a tiny length change can add a post.