Quick guide
How to use this calculator
- Gather Shipping cost per order, and Contribution margin before shipping (%) (0–100) for the same business scenario before calculating.
- Use the same order population and tax/shipping convention for revenue and costs; avoid mixing customer-paid and merchant-paid amounts.
- Apply the displayed free shipping threshold result to the stated decision only after checking every entered assumption.
Calculation method
Calculation method
Threshold = shipping cost ÷ contribution margin percentage.
The calculation uses these named inputs: Shipping cost per order, and Contribution margin before shipping (%) (0–100). No market rate, benchmark, tax rule, or accounting classification is inserted automatically.
Fixed-decimal arithmetic remains exact through display unless a result is explicitly labelled approximate, such as a square-root inventory quantity.
Ecommerce unit economics
Where the Free Shipping Threshold Calculator helps
Calculate the order value required for a contribution margin share of 0% to 100% to cover an entered shipping cost.
Use the result to model the order-level or channel-level economics produced by entered sales, fulfillment, platform, payment, refund, and advertising assumptions.
- Check contribution per order
- Compare two marketplace or fulfillment scenarios
- Stress-test refunds, fees, or advertising cost
Interpretation check
How to audit the result
Recalculate the scenario when any of these inputs changes: Shipping cost per order, and Contribution margin before shipping (%) (0–100).
Keep this formula beside the result: Threshold = shipping cost ÷ contribution margin percentage. Then compare the output with the source records and the calculator-specific assumption below.
- Confirm that all amounts use one currency and reporting period.
- Check that rates, counts, and quantities describe the same population or transaction set.
- Save the entered assumptions with the decision; the result alone is not reproducible evidence.
Worked example
Worked example
Shipping cost 8 and contribution margin 40% imply a 20.00 contribution break-even order value.
Threshold = shipping cost ÷ contribution margin percentage.
Supported inputs
Precision and limits
Visible input limits
Fixed decimals accept up to 30 digits and 12 decimal places and are capped at an absolute value of 1e12 per input. Rates are capped at 1000%; percentage shares and method-specific domains may be narrower.
International scope
No currency, tax jurisdiction, accounting framework, payroll rule, marketplace fee schedule, financing term, or industry benchmark is selected automatically.
Decision boundary
Use the result to model the order-level or channel-level economics produced by entered sales, fulfillment, platform, payment, refund, and advertising assumptions. Results remain arithmetic scenarios, not accounting records, forecasts, valuations, legal interpretations, professional advice, or recommendations.
Calculator-specific assumptions
This threshold covers only the entered shipping cost under the entered contribution margin. It does not optimize conversion or customer behaviour.