Reorder Point and Days-of-Cover Calculator for Marketplace Sellers in India

Your reorder point is the stock level at which you must place the next order: reorder point = average daily sales × lead time in days + safety stock. Example: 25 units a day, a 30-day lead time and 200 units of safety stock gives a reorder point of 950. Amazon India says its free Seller Assistant tracks stock, recommends when to reorder and flags slow-moving products. Use the calculator below to check its advice or to plan without it, as of November 2026.

What the defaults are

The defaults describe a made-up product. Amazon, Flipkart and quick commerce platforms do not publish a single lead time or safety stock rule, and we are not inventing one. Measure your own: days from purchase order to goods on sale. Amazon's older Restock Inventory page, from 2018, says the report gives fulfilment-centre-level restock and inbound quantity recommendations for FBA offers, with estimated days of supply, and sits under Inventory > Inventory Planning Dashboard > Restock Inventory. That page says accuracy improves when you enter procurement details, and it does not mention lead time. Menu names may have changed since 2018, so look in your own Seller Central.

Reorder point calculator

The formula, with a worked example

For example, you sell 25 units a day on average and can sell up to 40 on a good day. Your supplier plus transport plus marketplace receiving usually takes 30 days, but once it took 38.

1. Normal demand during lead time: 25 × 30 = 750 units.
2. Worst case: 40 × 38 = 1,520 units.
3. Safety stock is the gap: 1,520 − 750 = 770 units. That is a cautious setting. Many sellers use a smaller buffer; the right one depends on how costly a stock-out is for you.
4. Reorder point: 750 + 770 = 1,520 units.
5. With 1,100 on hand and nothing inbound, you are already below it. Days of cover are 1,100 ÷ 25 = 44 days, longer than the 30-day lead time, but the reorder point says to order now to stay safe against peak days.
6. Order quantity to cover 45 days: 25 × 45 + 770 − 1,100 = 795 units.

If a 770-unit buffer feels too large, lower the highest daily sales or the longest lead time. That is a decision, so write down why.

How long is my lead time, really?

Add these, using your own records:

• Supplier production and dispatch time.
• Transport to your warehouse or the marketplace warehouse.
• Your own prep: labelling, packing, quality check.
• Marketplace appointment, inbound and receiving time until the listing shows as in stock. We do not have a confirmed figure for Amazon or Flipkart receiving times in India, so measure the last three inbound shipments yourself.

Use the longest of recent shipments for the "longest lead time" box. For more on fulfilment choices, see Amazon FBA in India and Flipkart Fulfilment (FBF).

What about sale events and ads?

Demand spikes during sales. For a festive or Prime Day window, enter the peak daily sales you expect in the "highest daily sales" box, not your normal average, and book stock earlier. See the Great Indian Festival seller playbook and the Prime Day India seller playbook. Amazon's global Seller Assistant announcement says it handles inventory among other tasks and acts only with the seller's permission. Whether the India version takes actions on stock is not confirmed on Amazon's India page.

Ads and stock should move together. Amazon's budget guide says to monitor spend in flight and move money from underperforming campaigns to better ones. When a product is about to sell out, our suggestion is to pause or cut its ads so the money goes to a product you can ship.

What this calculator does not cover

• It assumes steady demand. Seasonal products and new launches need a forecast.
• It does not consider storage fees, minimum order quantities, or cash. Check your marketplace's fee table for storage and the cost of ageing stock; Amazon publishes it inside Seller Central.
• It uses a simple peak-minus-average safety stock, not a statistical service-level model.
• It treats stock as one pool. If you hold stock in several warehouses or sell on several platforms, do it per location.

FAQ

How do I calculate reorder point for an online store? Multiply average daily sales by lead time in days, then add safety stock. With 25 units a day, a 30-day lead time and 770 units of safety stock, the reorder point is 1,520 units. When stock plus inbound falls to that level, place the order.

What is days of cover? Days of cover is sellable stock divided by average daily sales. At 1,100 units and 25 a day, you have 44 days. Compare it with your lead time. If cover is shorter than lead time and nothing is inbound, you will run out before new stock arrives. Amazon's older restock page uses a similar idea, "estimated days of supply".

How much safety stock should I hold? There is no single right number. This tool uses peak demand over the longest lead time, minus normal demand over normal lead time. That is cautious. If a stock-out costs you ranking and sales, hold more; if cash is tight and you can reorder fast, hold less. Review after each shipment.

Does Amazon tell me when to reorder? Amazon India says Seller Assistant recommends reorder timing and flags slow-moving products. Its Restock Inventory report, as described in a 2018 post, gives restock quantities for FBA offers. Amazon does not publish the forecasting method, so check its advice against your own sums.

Should I use the same reorder point for every SKU? No. A fast seller with a short lead time needs a different number from a slow seller with a long one. Start with your top products, which are usually where a stock-out costs most, and apply the method to each.

Does this work for Flipkart and quick commerce? The maths does. The inputs differ: Flipkart and quick commerce platforms have their own inbound rules and timings, and we have not confirmed published receiving times for them. Use your own recent inbound records for lead time.

Plan stock with the rest of the account

Stock decisions touch ads, price and listings. If you want one team to run these together on Amazon.in, Flipkart and quick commerce, see Blooprint's catalogue and listing optimisation. BlooprintAI (blooprintai.in) is our ads-automation software.