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The forecast or replenishment is wrong. How do I fix it?
The forecast or replenishment is wrong. How do I fix it?
Checklist for ensuring forecast and replenishment accuracy
Jasper avatar
Written by Jasper
Updated over a week ago


If your forecast and replenishment recommendations don't look right, here's a checklist to make sure your information is correct:

  • What is the sales velocity? Does it look accurate?

  • Is the product marked as seasonal?

  • Are your days of stock set correctly? Note that you will need to set the days of stock for your store. 

  • Is your lead time correct? Note that you will need to set the lead time for your store. Lead time only applies to replenishment recommendations and does not apply to the forecasted sales.

  • What is your replenishment date? This indicates the last date to order to avoid stockouts. There will be replenishment recommendations before this date.

  • Are there out of stock days (stockouts) affecting the forecast?

  • Have the forecasting rules been updated manually? Look at Edit Forecast for a forecast override or percentage override

  • What is the time period for sales history


Sales Velocity

Sales velocity is the rate of sales excluding stockouts (days when the item is out of stock). This will inform you about the rate of predicted sales. 

If the first sale of the variant occurs during the reporting period, then the sales velocity calculation starts with the first sale date by default. Contact the Inventory Planner team if you would like the 'created at' date used instead of the 'first sold at' date.

To check the sales velocity, add columns to your Replenishment report by clicking the gear icon in the upper right corner.


When most of your products have more than 12 months sales history, you can use the seasonality to estimate the a forecasted increase in sales. Given a seasonal product, the forecasting algorithm puts more weight on sales 12 months ago and therefore accounts for the increase in sales (if any) of each particular product. To enable seasonal forecasting, select products in the Replenishment report and click Bulk Actions > Enable seasonality.

Days of Stock

Days of stock is a period of time for which you’d like to have enough stock, or, in other words, the desired stock cover. The dates your stock will cover is noted next to the Days of Stock field.

Dates shown in Days of Stock begin after the Lead Time.

Lead Time

The lead time is the amount of time between between placing a purchase order with your supplier and receiving products in your store or warehouse. Your supplier may tell you the lead time or you can determine it by reviewing past orders in Reports > Good Received Note. 

When in doubt, add a few days.

For more information on how to determine lead time and days of stock, read our article here.

Replenishment date

The replenishment date indicates the last date to order to avoid stockouts. This date is based on your current stock level, sales forecast (sales velocity), and lead time. There will be replenishment recommendations before this date.


Note that stockout history will show starting with the date you create your account in Inventory Planner. If you have stock history available prior to your Inventory Planner account creation date, you can import that information from the Replenishment screen by clicking on Import at the bottom of the screen.

View the sales history for the SKU in question. Are there out of stock days (stockouts) that are affecting the forecast? A crucial component of the forecast is the sales velocity, which excludes stockout days to determine the rate of sales if your store was fully in stock. 

View the sales history in Replenishment > Details.

View the Replenishment & Edit Forecast tab then Past Sales to see stockouts.

Forecasting Rules

Have your forecasted sales been updated? To see if there was a manual override for predicted sales, look at past sales in the Replenishment & Edit Forecast tab. (Instructions above for navigation.)

Any manual changes to forecasted sales will appear with a yellow outline.

To remove manual overrides to the forecast, you can delete any of these entries and Inventory Planner will automatically replace it with the default forecast.

Alternatively, you can clear any manual overrides in the Replenishment report using Bulk Actions. 

Date range used to compute sales velocity

Finally, review the date range Inventory Planner uses to consider trends in the sales history, including calculating the sales velocity. Any orders from customers during this time period will be used to calculate metrics and the forecast.

If sales were significantly higher or lower two years ago than they have been in recent months, it may make sense to limit this time period to the last six months or year. 

You can also set a different date range for individual variants in Details ("i" icon) > Forecast Settings.

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