Trading calculators
The arithmetic behind position sizing, leverage and trading costs, with the formula shown on every page. Nothing is stored and nothing requires an account.
Fee rates, funding rates, maintenance margin and model prices are all inputs you supply rather than numbers baked into the page — they differ by venue and by tier, and they change. Read yours from the venue and put it in.
Sizing and risk
- Position Size Calculator
How large a position can be before a stop-out costs more than the share of the account you chose to risk.
- Risk/Reward and R-Multiple Calculator
Turn an entry, a stop and a target into an R multiple, and see the win rate it needs to break even.
- Drawdown Recovery Calculator
The gain required to get back to flat after a loss — the asymmetry that makes loss limits worth having.
- Kelly Criterion Calculator
The Kelly fraction, and how far it moves when the win rate you fed it is a few points wrong.
Leverage and liquidation
- Liquidation Price Calculator
Where the exchange closes the position for you, given entry, leverage and maintenance margin.
- Leverage and Stop-Loss Table
At which leverage your liquidation sits closer than your stop — the point where the stop stops mattering.
- Futures PnL and ROE Calculator
Profit, fees and return on margin for a futures position, plus the exit price that breaks even.
Costs
- Trading Fee Calculator
Round-trip cost at your own maker and taker rates, and what share of a small win it consumes.
- Funding Rate Calculator
What a perpetual position costs — or pays — to hold, across the settlement intervals your venue uses.
- LLM Cost Calculator
What AI-assisted analysis costs per call and per month, and how many calls match a subscription.
Entries and accumulation
- Break-Even and Averaging-Down Calculator
Your new average after adding to a position, and what the added size costs you if it keeps going.
- DCA Calculator
Units accumulated and average cost across periodic buys, compared against one purchase up front.
- Compounding Calculator
Balance over time at a constant rate, with contributions — and what compounding adds over simple growth.