Have you ever been looking at wholesale products to buy to sell on Amazon and you see a product that looks good but its a part of a variation listings? How do you know which variation sells the best?
ReviewMeta is a website that quickly matches up the reviews to the listings so that you can determine how much each variation sells.
The way I do it is lets say we have a product with variations that sells 1000 units per month and if there are 100 reviews and the variation that has good profit and is the one i want to buy has 60 out of those 100 reviews I can figure out approximately how many I should buy using the math below.
Variation Reviews / Total Reviews = Review Percentage
Total Monthly Sales * Review Percentage = Approximate Variation Monthly Sales
In the case above:
60/100 = 0.6
1000 * 0.6 = 600 approximate sales per month for that variation.
This is how I have been figuring out how many of a product I should order for an initial order so that I am not over ordering and being stuck with a bunch of product and losing money.