How to Use This Tool
Estimate the extra merchandise revenue needed to fund shipping while preserving a target margin buffer. Calculate the incremental basket value needed to fund free shipping from contribution margin and a protected profit buffer.
The failure Free Shipping Floor is designed to catch
The threshold should sit above current AOV by enough contribution to fund postage, not merely above the postage amount itself. The boundary is the job stated in Set a Free-Shipping Threshold That Earns Back Its Own Delivery Cost; Free Shipping Floor is not intended to score or transform a different workflow.
The Free Shipping Floor input contract
The fields used for this specific operation are Average shipping cost, Contribution margin %, Protected margin %, Current average order value. Keep the source values beside the Free Shipping Floor result, because replacing the original would remove the evidence needed to reproduce or reverse the operation.
- For Free Shipping Floor, Average shipping cost starts at
8in the worked case; replace that example with the matching source value. - For Free Shipping Floor, Contribution margin % starts at
40in the worked case; replace that example with the matching source value. - For Free Shipping Floor, Protected margin % starts at
10in the worked case; replace that example with the matching source value. - For Free Shipping Floor, Current average order value starts at
45in the worked case; replace that example with the matching source value.
Worked result for Free Shipping Floor
The executable case called Default decision scenario expects out: $71.67. Verify that observation before entering real material, and then change one Free Shipping Floor field at a time so an unexpected direction or formatting change can be traced to a specific input.
Reading the Free Shipping Floor output
It combines average shipping cost, contribution margin %, protected margin % and current average order value into one decision result using the formula explained on the page. Apply that answer only when Average shipping cost, Contribution margin %, Protected margin %, Current average order value describe the same scope and format as the worked operation. If the source uses different units, quoting, nesting, timing or account rules, a plausible-looking Free Shipping Floor output is not sufficient validation.
Assumptions attached to Free Shipping Floor
- Free Shipping Floor assumes that all inputs describe the same unit or reporting period unless the field explicitly says otherwise.
- Free Shipping Floor assumes that the model includes only the four visible inputs and does not infer hidden platform charges.
If one of these Free Shipping Floor assumptions is false, keep the result as a diagnostic rather than production or decision data, and choose an implementation that explicitly supports the missing rule.
Evidence maintained for Free Shipping Floor
The recorded reference is US SBA — marketing and sales. Reopen that source when the definition, format, fee or policy behind Free Shipping Floor changes; private configuration and downstream acceptance still have to be checked in the user's own system.
Where Free Shipping Floor runs
The named operation executes in browser JavaScript without an ecech calculation API. For Free Shipping Floor, local execution reduces transmission but does not control browser extensions, device security or the destination where the result is pasted, so sensitive inputs still require the user's normal handling rules.
Sources & assumptions
Tool Spec v2 · verified 2026-08-18. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- US SBA — marketing and sales (checked 2026-08-18)
Model assumptions
- All inputs describe the same unit or reporting period unless the field explicitly says otherwise.
- The model includes only the four visible inputs and does not infer hidden platform charges.
