What this calculator does
This calculator builds a delivery window you can publish honestly, by adding supplier processing time, realistic transit times and a safety buffer for the weeks when things go wrong. It returns both a day range and real calendar dates, so you can put a specific expectation on the product page instead of a vague promise.
How to use it
- Enter supplier processing days — from the order being placed to it being dispatched.
- Enter the fastest realistic transit time you have actually seen, not the carrier's marketing figure.
- Enter the slowest realistic transit time from the same evidence.
- Add a safety buffer for customs, weekends and bad weeks.
- Publish the full window, and show the calendar dates at checkout. Under-promising here prevents most refund requests.
The formula, explained
The buffer is the part people remove and then regret. Customs holds, public holidays and weekend dispatch gaps are not rare events; they are a normal part of cross-border shipping and they always land on the customer who was already anxious.
Publishing the wider window costs a small amount of conversion and saves a large amount of support work. A customer told to expect fourteen days who receives the parcel in ten is delighted; one told to expect seven who receives it in ten opens a dispute.
A worked example
A supplier processes in 2 days, transit ranges from 7 to 14 days, and you add a 2-day buffer.
The earliest arrival is 9 days and the latest is 18, so the honest window is 9 to 18 days. On the product page that becomes a specific date range, which is far more reassuring than the phrase 'ships worldwide'. Showing dates rather than day counts also removes the ambiguity about whether the count started at the order or at dispatch.
| Processing | 2 days |
|---|---|
| Transit window | 7 to 14 days |
| Safety buffer | 2 days |
| Earliest arrival | 9 days |
| Latest arrival | 18 days |
What a good result looks like
Delivery expectations have tightened sharply, and delivery time is now one of the most common reasons a dropshipping order is refunded.
| Range | What it means |
|---|---|
| Under 7 days | Excellent for dropshipping. Say so prominently — it converts. |
| 7 to 14 days | Acceptable when stated clearly before checkout. |
| 14 to 21 days | Long. Expect support questions unless you send transit updates. |
| Above 21 days | Difficult. Consider a local supplier or a faster shipping line. |
Common mistakes
- Quoting transit time as total time. Processing happens before the parcel moves. Customers count from the moment they pay, so your estimate must too.
- Hiding the estimate on a shipping policy page. It belongs on the product page and at checkout. Discovering a three-week wait in a confirmation email causes cancellations.
- Ignoring holidays and factory closures. Extended national holidays can add a week or more to processing, and they are known well in advance.
- Promising the best case. The fastest delivery you have ever seen is not a promise. Quote a range, and let the fast deliveries be a pleasant surprise.
- Going silent during transit. Most delivery complaints are really information complaints. A tracking update at dispatch and again mid-transit prevents the majority of them.
Frequently asked questions
How long does dropshipping delivery usually take?
Typically 7 to 20 days for cross-border shipping, depending on the supplier, the shipping line and the destination. Suppliers with warehouses in your main market can cut that to 3 to 7 days, which is often worth a higher unit cost given the effect on refunds and conversion.
Should I show delivery times on the product page?
Yes. It is one of the highest-impact trust signals you can add, and hiding it does not prevent the wait — it just moves the disappointment to after the payment, where it becomes a refund instead of a decision not to buy.
How do I reduce delivery times?
Use suppliers with local warehouses, pay for a faster shipping line on your best sellers, or hold stock yourself for proven products. Faster processing agreements with your supplier can also remove a day or two at no extra shipping cost.
What buffer should I add?
Two to three days covers ordinary variation for most routes. Add more during known peak periods, extended national holidays in the supplier's country, and for destinations where customs clearance is routinely slow.
Do slow deliveries cause refunds?
They are one of the most common causes, and the effect is amplified by silence. An honest window published before checkout, plus proactive tracking updates, prevents most of them — run your rate through the refund cost calculator to see what those refunds are worth.
How this fits with your other numbers
Delivery time is the single expectation most likely to turn a satisfied buyer into a dispute, and it is almost entirely within your control to manage — not the duration itself, but what the customer was told to expect. An honest window published before checkout converts slightly worse and refunds dramatically better.
Feed the window into your product page, your checkout, your confirmation email and your support macros so the same number appears everywhere. Then use the refund cost calculator to see what your current delivery-related refunds cost, and compare that against the price of a faster shipping line — for many products the faster option pays for itself.