Apothecary
LIVEPractical tools for comparing exposure, costs, timing, and risk.
How to useEnter your assumptions and compare possible outcomes before acting.
Every tool here runs entirely in your browser on the numbers you type. Nothing is fetched, stored or sent anywhere, and no market data is connected.
Options payoff calculator
Profit or loss for a single option position at expiry, using only the numbers you enter.
Enter the contract terms and an underlying price at expiry to see P&L, breakeven and the known loss limit.
Profit / loss at expiry
$600.00
Breakeven underlying
104
Maximum known loss
$400.00
Position size
100 shares
A long option's loss is limited to the premium paid. This tool ignores commissions, fees, dividends, interest, early exercise and any value remaining before expiry.
Funding cost calculator
Estimated funding paid or received for holding a perpetual position over time.
Enter your position size, the venue's funding rate per interval, and how long you expect to hold.
Funding intervals
9
Per interval
$1.00
Estimated funding paid
$9.00
Assumes the rate stays constant for the whole period. Real funding changes each interval and differs by venue. Positive rates mean longs pay shorts.
Futures / perp leverage calculator
Approximate P&L and return on posted margin for a leveraged position.
Enter your margin, leverage and an assumed percentage move in the underlying.
Notional exposure
$5,000.00
Approximate P&L
$150.00
Return on margin
15%
Adverse move that erases margin
20%
Approximation only. Liquidation rules, maintenance margin, fees, funding, mark-price mechanics and insurance funds vary by venue — a position can be liquidated before the loss shown here is reached.
Expected move tool
A one-standard-deviation move implied by the volatility you enter, over the period you enter.
Enter the underlying price, an implied volatility you have observed elsewhere, and the number of days.
Expected move (1σ)
± 3.51
1σ as % of price
± 3.51%
Upper bound (1σ)
103.51
Lower bound (1σ)
96.49
Assumptions used: expected move = price × implied volatility × √(days ÷ 365), lognormal approximation, no drift, no skew, constant volatility. This is a width, not a forecast, and not a probability of direction. No volatility data is connected — every input is yours.
Position risk check
A short checklist of the conditions worth confirming before you open or adjust a position.
Work down the list; anything left unchecked is something you have not verified yet.
Confirmed
0 of 8
Still unverified
Expiry · Leverage · Liquidation · Funding · Liquidity · Event risk · Settlement · Corporate actions
This is a prompt to check your own assumptions. It produces no score, no rating and no buy or sell recommendation, and it does not know anything about your actual position.