What is a good/average conversion rate % for an e-commerce (marketplace model) for customers who add to cart through to purchase order.

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About 29% as a global benchmark.

Dan is 100% correct. Conversion always depends on Many factors. I have seen few sites or few categories where the conversion is even less than 1%. Building brand and trust is also important. As you build trust, your conversion increases. If you have similar products and services that your competitors sell then pricing plays a major role, else you need to have differentiation and define your target customers.

Also I would advice you to Focus on the following

1. Enhance the speed of site and make the design as simple and standard as possible
2. Mobile Layout and APP
3. Always help and engage your customers by giving lot of inputs from various mediums and drive traffic to your website from that. This helps you attain very good conversion (better than paid click ads of google and facebook)
4. Give good customer service
5. Devise a strategy to make customers buy from you again and again
6. Never follow one method. Try experimenting different ways to find out which works for you

Hope this information helps

A conversion is any desired action taken by a visitor on a website. Examples include signing up for a newsletter, downloading a guide, or making a purchase. The conversion rate is the percentage of visitors who perform one of these predefined actions. For e-commerce sites, the most relevant conversions are usually signing up for a new account, adding items to a cart, saving products on a Wishlist, and completing a purchase transaction. The conversion rate is useful because it tells you how successful your website is at guiding visitors into and through the sales funnel. A high conversion rate demonstrates that your website is successfully convincing visitors to become leads or customers, while a low rate indicates that there is room for improvement.
Conversion rates on e-commerce sites can vary widely across different sectors. This is due to the nature of the industry, the immediacy of purchase requirements, and the value of transactions.
1. Low conversion rates: Home Furnishings (0.4%) and Home & Garden (0.6%)
When making decisions about products for the home, consumers tend to spend a substantial amount of time researching and comparing their options, particularly when purchasing a high-ticket item. People shopping for home and garden products are also more likely to make a purchase in a bricks-and-mortar store. While they are likely to perform initial research online, they often like to see it in person before making a commitment. Think about the last time you purchased a sofa, for example. It might look perfect online, but you will only know for certain whether it’s the right investment once you’ve sat on it. Most people are unlikely to take a risk on such a high-value purchase, which explains the extremely low conversion rate.
2. Low conversion rates: Travel (0.7%) and Tourist Destinations (0.7%)
Again, travel and tourism website conversion rates are low due to consumer behaviour. In this sector, widespread research is commonplace. It is rare that someone will make a booking on their first visit to a travel website. Most travellers will perform price comparisons, check offers across different providers, and reach the final stage of the booking process without putting any money down – to check that the final price is within budget.
Plus, travel agents tend to make all the arrangements for those choosing to holiday through a travel agency which means that fewer people are online ‘converting’ themselves.
But there are sectors that are performing well, including:
3. Good conversion rates: Personal Finance (2.9%) and Finance (2.5%): E-commerce sites within the finance sector include those for banks, building societies, and insurance providers. The latter is unique, in that insurance providers tend to receive a substantial bulk of visits from people who have been referred by price comparison sites. These prospective customers are already warmed up to the product on offer and have largely made a purchasing decision before they even land at the provider’s site. Meanwhile, banks benefit from the strong pull of customer loyalty. Whether born of trust, risk aversion, or simply convenience, consumers tend to stay with their existing bank rather than have a portfolio of accounts across several institutions. The internet banking revolution has made it easier than ever for people to manage their money but interacting with a single app or website will always be a more streamlined experience than switching between several just to pay the bills.
4. Good conversion rates: Food and Drink (2.4%) and Food (2.1%): While online grocery shopping has been an established part of UK consumer behaviour for more than a decade, it’s still in its infancy in the US market. But interest is growing, and research has shown that a whopping 75% of consumers stick with the first retailer they order from. This explains, in part, the high conversion rate of food and drink sites. Another component is the explosion in popularity of ordering takeout food online. In the UK, the sector for home delivery is growing at ten times the pace of the wider eating-out market. Familiarity with a brand, as well as customer loyalty schemes, can be powerful pulls for consumers. Restaurant delivery sites and apps such as Postmates, Deliveroo, and Uber Eats have rapidly taken hold of the market, and by offering access to infinite restaurants under one umbrella, consumers are not bound by the same meal every time they want to order takeout. These services are therefore able to tap into the trend for exploring new cuisines, which helps to explain their conversion rate. Unlike high-ticket items that are expected to last a long time, such as home furnishings, food and drink decisions are relatively inexpensive and transient, making them low risk.
The global average e-commerce conversion rate falls between 1% and 4%. There is, however, a substantial disparity between countries. While e-commerce sites in the United States hover around the global average with a rate of 1.4%, the United Kingdom has an average conversion rate of 1.8%.
In the Eurozone, Germany and the Netherlands, both have a conversion rate of 1.4%, France hits an average of 1.1%, while Italy lags behind at 0.99%. Meanwhile, the conversion rate leader in Asia is Vietnam, with an average of 1.3%, while Singapore comes in at 1.1%, and the Philippines at 0. 8%. The reasons for this disparity are nuanced, and it is difficult to draw conclusions without a thorough cross-analysis of each market. However, a clue lies in broader consumer behaviour trends. For example, mature markets with an established online brand presence tend to produce higher conversion rates, while a move away from bricks-and-mortar to online shopping will naturally increase the rate. In the UK, for example, the prolonged decline of high street shopping, alongside a sustained rise in online retail, has seen off established brands that failed to make a convincing switch, in favour of new and legacy companies that have fully embraced digital selling. This provides some context for the UK’s slightly higher conversion rate.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath