Crypto Position Size Calculator: Risk, Stops & Leverage

Choose Percentage of capital or Fixed cash budget. In percentage mode, $2,000 allocated capital and a 0.5% budget mean a $10 modeled loss. In cash mode, enter $10 directly; capital still limits how much exposure can be funded. Neither input means that the position itself should be only $10.

The percentage is your input, not a recommendation from this site. The default is only an example. If several trades draw on the same balance, applying the whole account budget independently to each one can allocate the same money more than once. Use the free capital and loss capacity assigned to this trade, or reduce the other commitments first.

Choose a long or short before entering the stop. A long stop belongs below entry and a short stop above entry. Equal entry and stop prices do not describe a valid protective exit, even if a fee-only equation could return a number. The tool rejects that setup instead of producing an enormous position.

Keep price units consistent. A token quoted at $0.25 needs an entry of 0.25, not 25. Position notional is the full exposure at entry. Quantity is the number of underlying units represented by that exposure, subject to the contract’s own denomination. Some order tickets ask for contracts rather than coins; read the exact symbol and increment before copying a quantity.

The tool takes the smaller of two amounts: the notional your chosen stop-and-cost budget can support, and the notional your capital can fund at the selected leverage. It then rounds quantity down to the documented increment when available. The result names the constraint that binds before rounding.

Consider $10,000 of allocated capital, a 1% loss budget, a BTC long entered at $100,000 and a stop at $98,000. Use a hypothetical 0.055% commission on each leg and an extra 2-bp execution allowance. The $100 budget has to cover a 2% price loss plus those costs.

At the stop, closing commission is 0.0539% of entry notional because the exit value is 98% of the entry value. The modeled loss rate is therefore 2.1289%. Before quantity rounding, the budget supports about $4,697.26 of exposure, or 0.0469726 BTC. With a 0.001-BTC increment, round down to 0.046 BTC: $4,600 of entry exposure.

That rounded position models a $92 price loss, $2.53 opening commission, about $2.48 closing commission and $0.92 of additional allowance. The total is approximately $97.93. The remaining $2.07 is unused budget, not a fee or a calculation error. Rounding up to 0.047 BTC would slightly exceed the $100 budget under these assumptions.

At 5×, $4,600 requires $920 of base initial margin, plus the modeled opening fee. Plenty of the $10,000 remains uncommitted in this example. That does not mean the unused money automatically protects an isolated position; the liquidation test depends on the collateral actually assigned to it.

A mathematically valid quantity may still fail the contract’s minimum order requirements. Quantity step, minimum quantity and minimum notional answer different questions. A 0.001-BTC increment describes the spacing of acceptable quantities; a minimum notional establishes a separate value floor. Meeting one does not automatically meet the other.

Where the catalog includes an exact increment, the calculator rounds down. Where it does not, the result explicitly remains unrounded. That distinction prevents a display such as 0.0469726 from looking like a ready-to-submit order. The evidence panel links the contract reference used for the available rule.

If the smallest order exceeds your budget, do not round up simply to clear an exchange error. That changes the loss you authorized for the scenario. The useful conclusion may be that this contract is too coarse for the chosen budget. A different product with a smaller minimum can be worth comparing, but it needs its own fee, liquidity and margin checks.

There is also a difference between a single-order limit and a total-position limit. Multiple orders can sometimes build a position larger than one order’s cap. They cannot bypass a genuine aggregate position cap or a stricter risk tier. This calculator sizes one new position; it does not plan an order-splitting strategy.

A stop-based budget assumes the position survives long enough for the intended exit. If an isolated liquidation estimate lies between entry and your stop, the quantity calculation is incomplete as a trade plan. The exchange may take over the position before the loss reaches the level modeled in the stop equation.

For supported official isolated models with complete margin inputs, the tool performs a separate comparison. It reports the estimated liquidation price and whether the stop is earlier on the price axis. An unavailable comparison is shown as unavailable; it is not silently counted as a pass.

Treat a positive comparison as one check, not an assurance of the final loss. A stop triggered by last price and a liquidation triggered by mark price can behave differently. Execution gaps can also push a fill beyond the chosen stop. The additional allowance helps model a worse execution, but it cannot place a maximum on a discontinuous market move.

The useful response to a failed comparison is to revisit the amount of allocated collateral, leverage or exposure, then calculate again. Widening the stop without revising quantity increases the cash loss at that stop. The controls are connected even though they answer different questions.

This worksheet treats the entered quantity as a new position. If you already hold the contract, the proposed addition is not an independent trade merely because it is submitted as a second order. Total quantity, weighted average entry and the risk bracket can all change.

For an illustration, 0.1 BTC bought at $90,000 plus 0.1 BTC bought at $100,000 becomes 0.2 BTC at a $95,000 weighted entry, before fees. A $92,000 stop implies $600 of price loss against that combined entry. Calculating only the second 0.1 BTC at its own stop distance would miss the combined position’s behavior and previously committed collateral.

To evaluate the whole position, reconstruct total quantity and average entry, then account for existing collateral and costs. To budget only an addition, determine how much additional loss capacity remains after the old exposure. Neither approach should reuse the entire account budget as if the earlier trade did not exist.

Partial reductions also deserve fresh inputs. Fees already paid are historical cash costs; a closing-fee estimate on the remaining position is a future cost. Combining both into a single unspecified percentage can double-count charges or omit them. Keep the question clear: sizing a new order and reviewing an open position are related but different tasks.

The visual breakdown shows where the modeled budget goes. It is more useful than a naked quantity because you can see whether a wider stop, higher commissions or the execution allowance drives the result. Change the relevant input and watch the quantity adjust, rather than choosing leverage first and forcing the loss budget to fit.

A copied scenario includes your inputs and manual fee settings. It does not freeze exchange specifications or certify that the account can open the trade. Use the dated quantity and tier evidence when reproducing a calculation later. Reset returns to a hypothetical example and never changes an exchange account.