How to Calculate Your Break-Even Volume for Direct Granite Import from India
At what annual headstone volume does direct India import actually become worth it for your business? It is the question every mason asks before switching away from a wholesaler, and most never get a straight answer — just a vague sense that “you need to be doing a fair bit of volume” without a number attached. This guide gives you the actual calculation. Five steps, one worked example, and a number you can compare against your own order book by the end of it. The saving per headstone is real, but it only pays off once it covers the fixed costs that direct import adds on top of the stone itself.
Quick Answer
Break-even volume is the fixed cost of running one direct import container, divided by the saving per headstone blank compared to wholesaler pricing. For most independent UK masons, that works out to roughly 150 to 200 headstones per year. Below that volume, the admin and cash flow overhead of direct import generally outweighs the per-unit saving.
Step 1 — Calculate the saving per headstone
Start with the gap between what you currently pay a wholesaler per blank and what you would pay buying direct from India at FOB plus freight. This varies by size and variety, but a typical saving lands somewhere between £20 and £50 per headstone blank once the wholesaler’s margin is removed from the equation. Get this number from your own invoices, not from a general industry figure — pull your last ten wholesaler purchase orders for the sizes you actually sell and work out the average price per blank, then compare it against a landed cost quote for the same specification direct from a supplier.
This is the number that does the heavy lifting in the whole calculation, so it is worth getting right rather than estimating. If you have not worked out a full landed cost figure before, our guide on calculating landed cost for direct granite import walks through freight, duty, and port charges in detail — the saving per headstone in this calculation depends on that figure being accurate.
Step 2 — Calculate the fixed costs of direct import
Direct import carries fixed costs that a wholesaler purchase does not, and these need adding up per container before they can be compared against your per-headstone saving.
Customs and freight agent fees
A customs agent handling your import declaration and associated port-side administration typically costs somewhere in the £250 to £500 range per container, depending on how much of that work — declaration, port handling coordination, delivery booking — is bundled into one fee versus billed separately. If you are also using a separate freight forwarding agent rather than handling logistics yourself, add their fee on top; this varies enough by route and provider that you will need a quote specific to your shipment rather than a rule of thumb.
Your own time
Managing a direct order — specification, sample approval, production check-ins, documentation review — takes real hours that a wholesaler purchase does not. Estimate 2 to 4 hours per container and value that time at whatever your hourly rate would be doing chargeable work instead. This is easy to skip in a back-of-envelope calculation, and it is exactly the kind of cost that makes direct import look better on paper than it feels in practice if you leave it out.
Converting fixed costs to a per-headstone figure
Add the agent fees, freight costs, and the value of your time together to get a total fixed cost per container. Divide that by the number of headstone blanks a standard container holds for your typical size mix — StoneCrest’s standard 20ft container carries roughly 80 to 100 slabs at 30mm thickness, though your actual blank count per container depends on the sizes and thicknesses you order. This division gives you the fixed cost per headstone, which is what step 5 compares against your per-unit saving from step 1.
Step 3 — Calculate the cash flow cost
Direct import generally requires an advance payment before production begins, with the balance settled later in the order cycle — terms vary by supplier and should be confirmed directly with whoever you are ordering from. As an illustrative example, if 30% of the order value is paid roughly 10 to 12 weeks before the container arrives, that money is unavailable to your business for that entire period. This is not a cost that disappears just because you have the cash sitting in the bank — it is money that could otherwise be earning interest, funding other stock, or sitting as working capital buffer.
Work out the opportunity cost using whatever rate makes sense for your business: your overdraft interest rate if you would otherwise be borrowing, your savings rate if the cash would otherwise sit earning interest, or simply a conservative estimate of what tying up that capital costs you in flexibility. On a mid-sized container order, this can easily add up to a meaningful figure once spread across the weeks the advance is outstanding, and it belongs in the same total as your agent fees rather than treated as a separate, ignorable cost.
Step 4 — Calculate the storage cost
A container’s worth of granite blanks takes up more space than the smaller, more frequent deliveries a wholesaler relationship typically allows. If you need to rent additional storage, convert part of your yard, or simply tie up space you would otherwise use for other stock or work-in-progress, that has a cost — even if it is the opportunity cost of space you already own rather than a new rental bill. Estimate this honestly. A mason with a large yard and spare capacity might add little or nothing here; a mason working from a tighter site may find this is one of the more significant fixed costs in the whole calculation.
Step 5 — The break-even calculation
Add together the total fixed costs from steps 2, 3, and 4 to get one figure: the total fixed cost of running a single direct import container. Divide that total by the saving per headstone you calculated in step 1. The result is your break-even volume — the number of headstones in that one container’s worth of stock that need to be sold at the saved margin before direct import has paid for its own overhead.
If your annual volume comfortably exceeds that break-even number, direct import is working in your favour on every headstone beyond it. If your volume sits below it, the fixed costs are eating into or exceeding the saving, and a wholesaler relationship may still be the better commercial choice until your volume grows.
Worked example
Take a mason saving £35 per headstone blank buying direct instead of through a wholesaler. Customs and freight agent fees come to £400. Time spent managing the order, valued at £30 an hour for 3 hours, adds £90. The cash flow cost of a 30% advance tied up for 11 weeks, valued conservatively, adds roughly £180. Storage costs for the extra space needed add £150. Total fixed cost per container: £820. Divide that by the £35 saving per headstone, and the break-even point is roughly 23 to 24 headstones from that single container.
That number looks small in isolation, but it is per container, not per year — and most independent masons are not filling a full container’s worth of headstone-grade blanks from a single order purely for their own use unless their annual volume is well into three figures. This is why the rule of thumb for most UK independent masons lands at roughly 150 to 200 headstones a year before direct import clearly outperforms a wholesaler relationship on the full picture, not just the per-unit price. Below that volume, the fixed costs and cash flow commitment of a full container often outweigh what the per-headstone saving alone would suggest.
What this means if you are below the threshold
If your current volume sits below your calculated break-even point, that does not necessarily mean direct import is off the table permanently. Mixed containers across multiple granite varieties, combining orders with another mason in your area, or simply growing volume over a year or two before switching are all ways the calculation can shift in your favour without taking on more risk than your current business size can absorb. The number exists to stop you guessing — not to lock you into one path regardless of how your business changes.
Frequently Asked Questions
What if I only need granite for a few headstones a year?
At low volume, a wholesaler relationship is very likely the more economical choice once fixed costs and cash flow are accounted for honestly. The per-unit saving from direct import is real, but it needs enough volume behind it to absorb the fixed costs of running a container. Run the calculation with your own numbers before assuming either way.
Does this calculation change if I order a mixed container of different granite varieties?
The fixed costs in steps 2 to 4 stay broadly the same whether the container holds one variety or several, since customs, freight, cash flow, and storage costs are largely driven by the container itself rather than its exact contents. A mixed container can be a useful way to reach a fuller load and spread fixed costs across more headstones sooner, particularly for masons who are close to their break-even threshold but not quite there on a single variety.
How accurate do my own numbers need to be for this to be useful?
Reasonably accurate, but this is a planning calculation, not an audited account. Use real invoices for your wholesaler comparison rather than rough memory, get an actual quote for agent fees rather than guessing, and be honest about the time and storage costs even if no invoice exists for them. A calculation built on realistic estimates will tell you far more than a guess in either direction.
Want us to run this calculation for your specific volume and sizes? Send us your numbers and we will work through the break-even point for your actual order pattern, not a generic average.