Crypto perp tools

Small server-rendered calculators for active perpetual futures traders. No JS, no signup, no tracking. Bookmark whichever ones you use.

Funding fee calculator Given a notional, funding rate, and period — how much do you pay (or receive) per period and over a year?
Annualize a per-period funding rate Convert a 1h / 4h / 8h / 24h funding rate to its annualized equivalent.
Position size calculator Given account size, risk %, entry, and stop — how big should the position be?
Cross-venue fee comparator For a given notional, see the round-trip taker fees on each major exchange.
Liquidation price calculator Approximate liquidation price for an isolated-margin position given entry, leverage, and side.
Perpetual basis calculator Compute the perp − spot basis and understand the implication for funding rate direction.
PnL calculator Realized profit and loss on a perp position given entry, exit, size, and side.
Breakeven calculator How far does the price need to move to break even after round-trip taker fees?
Kelly criterion calculator Optimal fraction of capital to risk per trade given win probability and win/loss ratio.

Get the launch email

When the paid tier launches, the 4 people on the waitlist get a one-time email + a free upgrade. No spam, no follow-up sequence. Single email.