[intro]In this Guide you’ll learn how to create a Wallpaper Calculator on an existing Product with Variants on your EKM online shop. Before you begin, you will need to have installed the Product Calculators feature. [/intro]
1. You can also add a Wallpaper Calculator to Products with Variants. Before you begin, you need to ensure that you’ve already created the Product and its Product Variants. Within the Add/Edit Product window, click More Options:
2. Now you need to click the Calculator tab on the left-hand side:
3. Tick the box to display a Calculator on the Product Page:
4. Ensure you’ve selected Wallpaper Calculator from the drop-down and if applicable, tick the box to allow Wastage, before clicking the green Edit Variants button:
[remember] Tick the box to Allow Wastage, if applicable. Allowing Wastage means that when calculating the total amount of paint required, the system can round up, so that the customer can choose to have slightly more than what they need to allow for mistakes on the Product Page. [/remember]
5. Now you need to click Edit on the far right-hand side of the first Product Variant:
6. Click the Calculator tab on the left-hand side:
7. Now you need to add in the total amount of wallpaper on each roll. Select from metres, feet, millimetres or centimetres, and then complete the Roll Width and Roll Height fields, before clicking Return to Master Product:
8. Next, you need to click the Edit button on the far right of the next Product Variant down:
9. Repeat the same process, clicking the Calculator tab and completing the relevant fields, until you have done all of the Product Variants on this Product. When you have finished, click the Save & Close button:
10. On the Product Page, you’ll see a drop-down menu for your Product Calculator. Click it: 
11. This will reveal the Product Calculator. The customer must add the Width and Height of their walls in metres, feet, centimetres or millimetres. When they have added in the dimensions of the first wall, they simply need to click Add Another Area to add in the dimensions of any additional walls:
12. When the customer has added in the dimensions for each of the walls they want to paper and their chosen Variant, they can then tick the Wastage box if they want the system to round up, to ensure that they have enough wallpaper for their project:
13. The customer can then click Add To Cart, and all of the paint they require - according to their wall dimensions - will have been added into the Cart:
[remember]If you have a lot of Products you would like to add Product Calculators to, you can always use spreadsheets and the Import/Export System. Read more in this Guide. [/remember]
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[contact] If you need our help with your EKM online shop, contact your Ecommerce Expert or the Customer Support Team, who will be able to point you in the right direction. We're open from 8am-6pm weekdays and 9am-5.30pm weekends. If you'd like to suggest a feature or an upgrade on any of the EKM platforms, please let us know on the EKM Suggestions Board. If you have a non-account-specific question to ask the EKM Team, join us in the EKM Community. [/contact]