Trading calculators
Twelve calculators that run entirely in your browser. Nothing is uploaded, no account is needed, and Arabic, Persian and Latin digits are all accepted.
Position size
How much to buy so a stop-out costs exactly what you decided, never more.
Risk / reward
The win rate you need before this trade is even worth taking.
Profit & loss
Exact result of a closed trade, including both sides of the fee.
Liquidation price
Where the exchange closes the position for you, and whether your stop sits safely inside it.
Funding cost
What a perpetual position costs you while you simply hold it.
Break-even after loss
How much you must gain to recover, and why deep losses rarely come back.
Dollar cost average
Average price across a series of buys, and where you stand today.
Average down / up
Your new average entry after adding to an existing position.
Compound growth
What a steady return per period becomes over time.
Risk of ruin
The odds of losing your account at your current win rate and risk level.
Percentage move
The gap between two prices, both ways round.
Fee drag
What trading frequency quietly costs you over a year.
How to use these together
Most traders reach for one calculator and stop there. The order that actually protects an account is this: decide the stop first, size the position around it, check that liquidation sits at least twice as far away as that stop, then price the funding cost if you plan to hold for days. Only after those four does the reward ratio matter — a 5:1 target means nothing on a position that gets liquidated first.
The risk of ruin calculator is the uncomfortable one. Enter your real win rate from your own records rather than the one you hope for, and it will tell you whether your risk per trade is supported by your edge. Most accounts that fail were not wrong about direction; they were right too small and wrong too large.
The desk runs the same calculators beside live prices, funding, liquidations and your own trade journal.
Open the desk