Calculate total supply chain lead time across every stage — manufacturing, transit, customs, last-mile, and internal processing. Get your planning lead time with buffer.
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5-stage breakdown
AI analysis included
Enter Your Lead Time Stages
Enter the days for each stage in your supply chain. Leave blank or enter 0 for stages that don't apply.
Optional context
Lead time stages
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Manufacturing / ProductionTime from order placement to goods ready to ship
days
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International TransitOcean, air, or road freight in transit
days
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Customs ClearanceImport inspection, duty payment, and release
days
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Last-Mile DeliveryFreight from port / hub to your warehouse
Get a complete, AI-written brief covering bottleneck analysis, risk scenarios, optimization tactics, and a planning recommendation — tailored to your specific lead times.
Writing your Lead Time Analysis Brief…
AI is analyzing your lead times and crafting recommendations. Usually takes 10–20 seconds.
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📄 Your Lead Time Analysis Brief
How to Use This Lead Time Calculator
A step-by-step guide to getting the most accurate results
Step 1: Enter days for each stage. Only fill in stages that apply to your supply chain. Leave blank or enter 0 for stages that don't exist (e.g., if your supplier is domestic, leave "International Transit" and "Customs Clearance" blank).
Step 2: Use realistic averages. Use your actual average lead time per stage — not the best-case or worst-case. If you don't have data, ask your freight forwarder or use: manufacturing 14–30 days, ocean freight 20–35 days, customs 2–5 days, last-mile 2–5 days, internal processing 1–3 days.
Step 3: Use Planning Lead Time for reorder points. The "Planning Lead Time" (with 20% buffer) is what you should plug into your reorder point formula. This protects you from typical delays without over-stocking.
Step 4: Generate the AI brief. The AI brief will analyze your specific lead time profile and give you stage-specific optimization recommendations and risk scenarios.
Lead Time Formula
Total Lead Time = Manufacturing + Transit + Customs + Last-Mile + Internal Processing
Planning Lead Time = Total Lead Time × 1.20 (20% safety buffer)
The 20% safety buffer is a standard industry rule-of-thumb. For highly variable suppliers or critical SKUs, consider using 25–30%. For reliable domestic suppliers, 10–15% may be sufficient. Use the AI brief to get a stage-specific buffer recommendation for your situation.
Frequently Asked Questions
What is supply chain lead time?
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Supply chain lead time is the total time from when you place a purchase order with a supplier to when the goods are available in your warehouse, ready to sell or use. It includes every stage: manufacturing/production time, international transit, customs clearance, last-mile delivery, and internal processing (receiving, QC, put-away). Lead time is critical for setting reorder points and avoiding stockouts.
What's a typical supply chain lead time?
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It varies significantly by origin and mode: China to US ocean freight is typically 45–60 days total (30 days manufacturing + 20–25 days ocean + 3–5 days customs + 2–5 days last-mile). China to US air freight is typically 20–30 days. Domestic US suppliers can be as short as 3–14 days. Always measure your actual lead times rather than relying on general benchmarks.
How do I use lead time in my reorder point calculation?
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The standard reorder point formula is: Reorder Point = (Average Daily Demand × Lead Time in Days) + Safety Stock. Use your Planning Lead Time (with buffer) — not the raw total — in this formula. For example, if your total lead time is 45 days and daily demand is 20 units, your reorder point should be at least (20 × 54) = 1,080 units plus safety stock. Our Reorder Point Calculator automatically incorporates lead time into the calculation.
How do I reduce my lead time?
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Focus on your bottleneck stage first (the longest stage). Common reduction strategies: Manufacturing — negotiate dedicated production slots, pre-position raw materials at supplier, or qualify a second supplier. Transit — switch from sea to air for high-value or urgent SKUs, or negotiate faster Incoterms. Customs — ensure 100% accurate documentation, use a licensed customs broker, apply for pre-clearance programs (ACE/AEO). Internal processing — implement cross-docking, pre-label shipments, or streamline QC processes. The AI report provides specific tactics for your lead time profile.
Why add a safety buffer to lead time?
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Lead times are rarely exactly as estimated. Port congestion, production delays, customs holds, and carrier issues all cause variability. A 20% buffer on top of your average lead time provides protection against typical delays. Without a buffer, you'd experience stockouts roughly 50% of the time (when actual lead time exceeds average). With a 20% buffer, you're protected against most common delays. For high-variability suppliers or critical SKUs, use a larger buffer.
What's the difference between lead time and cycle time?
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Lead time is the elapsed time from order placement to delivery — it's calendar time that passes, including waiting periods and handoffs between parties. Cycle time (or throughput time) is the time actively spent on a specific process — it measures efficiency and excludes waiting time. For supply chain planning and reorder points, you always use lead time. Cycle time is more relevant for manufacturing process improvement and lean analysis.