Ecommerce Startup Cost Calculator

Inventory is the line that grows.

Inventory is the line that grows. Inventory is the largest line and the one that grows when the business works.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Currency

Opening inventory

Website & branding

Photography & content

Equipment & packaging

Legal, registration & insurance

Launch marketing

Monthly overheads

Months of runway

Contingency

Capital to start

$65,760

including $10,960 contingency

Inventory$24,000

Setup and content$10,400

Marketing and runway$20,400

Inventory share of total36.5%

Inventory is 36.5% of the requirement and it is the line that grows when the business works. Every reorder before the first has sold through demands more capital, which is why the second order kills more stores than the first.

How the Ecommerce Startup Cost Calculator works

Inventory is the largest line and the one that grows when the business works. Every reorder placed before the first has sold through demands more capital, which is why the second order kills more stores than the first.

Also known as: cost to start an online store · ecommerce launch budget · how much to start selling online

The costs before the first sale

Inventory is the largest and the one most often underestimated, because minimum order quantities are set by suppliers rather than by your budget. A supplier's 500 unit minimum on a £6 item is £3,000 before freight, and that is per SKU.

Then the goods-adjacent costs: samples, which run several hundred pounds across a few suppliers and are money well spent; freight and duty on the first order; packaging, which usually has its own minimum order quantity and its own lead time.

Then setup: a website, whether that is a Shopify subscription and a theme or something custom; photography, which is the line most often done badly to save money and most often visibly costs sales; and any registration, insurance or compliance testing the category requires. Toys, cosmetics and electricals all carry testing requirements that are not optional and are not cheap.

The recurring costs that start immediately

Platform subscriptions are the obvious ones and they accumulate. A Shopify plan, an email tool, a reviews app, an analytics tool and a returns portal is easily £150 to £400 a month before anything has sold.

Storage, whether that is a spare room at no cash cost, self-storage, or a 3PL minimum. Payment processing, which is per transaction and therefore starts at zero and scales.

Then advertising, which is the largest recurring cost for most new sellers and the one with no floor and no ceiling. A launch budget is genuinely discretionary and treating it as fixed produces a plan that cannot flex when the early results come in.

Working capital, which is the part that gets missed

The most common failure in a startup budget is funding the first order and nothing else. The second order has to be placed before the first has sold through, and in a growing business it is larger.

Model it forward. Order one at 500 units, selling 200 a month, needs reordering at month two if the lead time is 60 days. That reorder is due before the first order has generated its full revenue, and if sales are ahead of plan the reorder is bigger.

Which is why the rule of thumb for a stock business is to budget the launch cost plus at least three months of operating cash plus the second order. Businesses that fund only the launch reach month three with stock selling well and no money to buy more, which is the most frustrating way to stall.

What can genuinely be deferred

Custom development, almost always. A standard theme with careful configuration sells as well as a bespoke build for the first year, and the money is better spent on stock and photography.

Branded packaging beyond the basics. A printed mailer looks good and does nothing for conversion at launch. Plain packaging with a good insert card achieves most of the effect at a fraction of the cost and the minimum order quantity.

Range breadth is the biggest deferrable of all. Launching with three products rather than fifteen cuts the inventory requirement by 80% and tells you which ones work before you commit to the rest. The instinct to launch a full range is strong and it is nearly always the wrong use of the first tranche of money.

The realistic range

Numbers vary so widely by category that any single figure is misleading, but the shape is consistent. A dropshipped or print-on-demand launch can start under £1,000 because there is no inventory. A stocked single-product launch typically needs £5,000 to £15,000 to be viable. A branded multi-SKU launch with custom packaging and compliance testing is £25,000 and upwards.

The variable that moves it most is not ambition, it is minimum order quantity. A supplier who will do 100 units changes the arithmetic completely against one who insists on 1,000, and finding the first is worth considerable effort at the start.

Whatever the figure, budget a contingency of 20% to 30%. First orders arrive wrong, freight costs more than quoted, packaging does not fit, and a compliance requirement surfaces that nobody mentioned. None of these are unusual and all of them cost money that was not in the plan.

Where to go next

The Ecommerce Startup Cost question rarely arrives on its own. These are the ones that usually come with it:

Runway Calculator — Growth extends it, if the growth holds.
Inventory Financing Calculator — What share of gross profit the money costs.
Break-Even Timeline Calculator — Two break-evens, months apart.
Etsy Fee Calculator — Every Etsy fee on one sale, itemised.

Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price, check the platform's current fee schedule before you price a product against it. This is not tax or business advice.

Frequently asked questions

How much does it cost to start an ecommerce business?

Opening inventory dominates, then content and branding, then a launch marketing budget and several months of overheads. For a product business, inventory is usually half or more of the total.

Why does the second order cause problems?

Because it has to be placed before the first has been sold and paid for. Growth means always holding more stock than you have sold, funded from a balance that has not yet been earned.

How much contingency should I hold?

Twenty percent is a reasonable planning figure. Customs surprises, a failed sample and a slow launch each cost money that was not in the budget.

Can I start with less inventory?

Print on demand, dropshipping and made-to-order all reduce the inventory line to nearly nothing, at the cost of margin, control or lead time. Each is a legitimate trade.