EVE Online Trading Budget — Complete Guide
Most new station traders make the same mistake: they dump their entire budget into whichever item has the highest margin, buy far more units than the market actually needs, and end up holding stock nobody's buying. How much of your budget goes into each item matters as much as picking the right items. This guide covers profit efficiency, days-of-supply sizing, EVE's 150-order limit, and how to turn any budget into a diversified basket.
- Why position sizing matters
- Profit efficiency vs absolute profit
- Days of supply — how big a position should be
- The 150-order limit
- Risk profiles: quick flip, balanced, deep stock
- Putting it all together — example allocation
- Common mistakes that waste capital
- Tools that build the basket automatically
Why position sizing matters
Station trading profit isn't just about margin — it's margin × volume you can actually move. A 40% margin item that trades 2 units a day will never make you rich, no matter how much ISK you throw at it: you'd be sitting on stock for months. A 12% margin item trading 5,000 units a day can outperform it easily, just by turning over faster.
Position sizing is the discipline of matching how much you buy to how much the market can absorb — not how much you can afford.
Profit efficiency vs absolute profit
With a fixed budget and a list of profitable items, the question isn't "which one is most profitable overall" — it's "which one gives me the most profit per ISK invested". That's profit efficiency: profit per unit ÷ buy price.
A 10M ISK item with 500K profit (5% efficiency) beats a 100M ISK item with 3M profit (3% efficiency): the cheaper item lets you buy more units with the same capital, so its total profit for the same ISK outlay is higher. Ranking by efficiency, not by raw profit-per-unit or raw margin, is what lets a small budget compete with a large one.
Days of supply — how big a position should be
Even a high-efficiency item has a natural size limit: how much of it the market actually trades per day. Buy 10 days' worth of a 50-units/day item and you've bought 500 units that will take weeks to sell through — capital locked, and the price may move against you before you're done.
Days of supply caps position size at N days' worth of the item's average daily volume. Lower N means faster turnover and less exposure per item; higher N means bigger positions and more profit per item, at the cost of a slower exit if the market shifts. Three days is a reasonable middle ground for most traders — enough to build a meaningful position, short enough that you're not stuck holding it.
The 150-order limit
EVE caps every character at 150 active market orders. Station trading needs a buy order and a sell order live at once for each item you're working — so the real ceiling is 75 different items in an active station-trading portfolio, not 150.
This matters for budget sizing: past a certain point, adding more ISK doesn't buy more positions, it buys bigger positions in the same 75 slots. If you're consistently hitting the cap, the next lever is Broker Relations and Accounting skills (lower fees make thinner margins viable) or a second character — not a bigger wallet.
Risk profiles: quick flip, balanced, deep stock
- Quick flip — 1 day of supply — smallest positions, fastest capital turnover, lowest exposure per item. Good for volatile markets or when you're actively managing orders daily.
- Balanced — 3 days of supply — the default for most traders. Meaningful position sizes without betting on any single item's liquidity holding up for long.
- Deep stock — 7 days of supply — largest positions and the most profit per item, but a full week of price exposure before you're guaranteed to sell through. Best on stable, high-volume items you've traded before and trust.
Putting it all together — example allocation
Say you have 500M ISK and a Tech 2 ammunition item is trading at:
- 40 ISK buy / 46 ISK sell, ~5.2 ISK net profit per unit after fees (13% margin)
- 8,000 units/day average volume
- Risk profile: Balanced (3 days of supply)
Days-of-supply cap: 8,000 × 3 = 24,000 units. Budget-affordable units at 40 ISK: 500,000,000 ÷ 40 ≈ 12.5M units — the supply cap is reached long before the budget is.
Units bought: 24,000 — cost 960,000 ISK, expected profit roughly 124,800 ISK/day on this one position alone.
A 500M budget clearly isn't exhausted by one item. A real basket spreads across dozens of items, highest-efficiency first, until either the budget or the 75-item order cap is reached.
Common mistakes that waste capital
- Sizing by budget alone, ignoring days of supply — you end up holding stock the market doesn't want yet.
- Chasing the single highest-margin item with your whole budget — concentration risk — if that item's price moves, so does your entire position.
- Ignoring the 150-order limit — trying to run 100+ items on one character and hitting order caps mid-session.
- Confusing margin with efficiency — a huge margin on an expensive, illiquid item is often worse than a modest margin on something cheap and liquid.
Tools that build the basket automatically
Doing this by hand means pulling a full station trading snapshot, computing efficiency for every item, sorting, and checking the days-of-supply cap against your risk tolerance — for hundreds of candidates. Nobody does that correctly by hand every day.
- eve-hub trading budget tool — enter your budget and risk profile on the trading budget page, and a greedy allocator builds the basket for you — sorted by efficiency, capped by days of supply and the 150-order limit, using your character's real broker fee and sales tax.
- Station trading scanner — the same underlying data on the station trading page, browseable without a budget constraint if you'd rather pick positions manually.