Delivery Time Calculator
Estimate total delivery days by combining processing time with transit days derived from shipping method and distance, adjusted for the day of order placement. Ideal for e-commerce stores setting delivery date promises.
Last updated: September 2026
Formula below · 1 source (Wikipedia) · Updated Sep 2026
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About this calculator
This calculator estimates total delivery time as processing days plus transit days plus any weather delay. Transit days depend on the shipping method: overnight is 1 day; express is ⌈distance / 800⌉ + 1 days; ground is ⌈distance / 500⌉ + 1 days; freight/LTL is ⌈distance / 400⌉ + 2 days. The per-day mileages (800 for express, 500 for ground, 400 for freight) approximate how far each network moves a shipment per day, and the extra day covers pickup and final delivery. Weather risk adds 0, 1 or 2 days. The result is never less than 1 business day for overnight or 2 for other methods. All results are business days; weekends and holidays extend the calendar time.
How to use
An order has 1 day of processing, will travel 750 miles by Express, with no weather risk. Step 1: Express transit = ⌈750 / 800⌉ + 1 = 1 + 1 = 2 days. Step 2: Add processing = 1 + 2 = 3 days. Step 3: Weather delay = 0, so the estimate is 3 business days. The same order by Ground would take 1 + (⌈750 / 500⌉ + 1) = 1 + 3 = 4 business days.
Frequently asked questions
How does the weather delay setting affect estimated delivery time?
The weather setting adds whole days to the estimate: 0 for no weather risk, 1 day for moderate risk and 2 days for high risk such as winter storms or hurricanes along the route. Orders placed after the carrier's daily pickup cutoff (often 2–5 PM) also effectively start the next business day, so add a processing day for late orders.
Why does this calculator divide distance by 500 to estimate transit days?
The 500-miles-per-day figure is a commonly used approximation of average ground carrier daily range in the continental U.S. Major carriers like UPS and FedEx Ground typically cover 500–600 miles per transit day for direct routes. Dividing your shipping distance by 500 and applying a ceiling function gives a quick, conservative day estimate without needing zone charts. For more precise estimates, use carrier-published zone-based transit maps or the zone-aware delivery time calculator above.
What is the difference between processing time and transit time in a delivery estimate?
Processing time is the period between order placement and the moment a package is handed off to a carrier—covering payment verification, picking, packing, and labeling. Transit time begins once the carrier scans the package and ends at the customer's door. Total delivery time is the sum of both. Many delivery complaints arise from confusion between these two phases; customers see 'shipped' notifications and expect immediate delivery, not realizing transit time only starts at that point. Displaying both figures separately on checkout pages reduces support inquiries.