Five small tools for the arithmetic that decides whether a TradFi perpetual position survives: where it liquidates, what the carry costs, how large it should be, what a weekend does to it, and which pricing regime is live right now. Every one of them runs entirely inside this page.
The isolated-margin approximation: entry, leverage, maintenance-margin rate and any added margin in; liquidation price and distance from entry out. The page also lists everything the approximation leaves out (fees, funding accrual, the leverage-tier ladder) and why liquidation triggers off the mark price rather than the last trade.
COSTEnter notional, the rate, holding period and the contract's current funding interval. The calculator compares payment per settlement and total across a selected schedule; 4-hour and 8-hour contracts do not produce the same count. A 0% interest input does not reveal trader headcount.
SIZINGQuantity is your account risk in USDT divided by the distance from entry to stop. Leverage appears only at the end, to tell you how much margin is locked up. Flags two conditions: a required margin larger than your stated equity, and a notional below the 5 USDT minimum for TradFi perps.
EXPOSUREOver a weekend the US underlying prints no price while Binance says the closed-session index uses Orderbook EWMA. Enter a gap scenario to see the loss in USDT, the share of isolated margin it consumes, and the adverse move a given leverage may survive.
CLOCKLocal UTC and US Eastern time, the current US equity session, the price-index mode that session implies, and a countdown derived from the funding interval you select. It uses your browser clock and standard market hours; it does not read the contract, holidays, early closes or Binance's live mode.
No account connection, no API key, no login, no sign-up. Nothing you type is transmitted anywhere, nothing is stored, and there is no server-side component to any of them — the arithmetic happens in the page and stays there. They are calculators, not a trading terminal, and they cannot see your positions.
Each tool loads with a worked example already in the boxes, so the first thing you see is a result rather than an empty form. Change any input and the readouts update as you type. Every page writes the formula out in prose underneath, with the same worked example done by hand, so you can check the arithmetic and so the page still teaches something with JavaScript disabled.
None of them model fees. Binance publishes the standard USDⓈ-M futures schedule on its public fee page, while your applied tier, discounts and trade-specific charge belong to your own account records. The cost guide separates those sources. None of the tools models slippage either, which can exceed the posted fee on a thin contract outside US hours.
Where a tool and Binance disagree, Binance is right. The trading interface computes your liquidation price with your actual leverage tier, your actual margin mode and your actual fees; these pages compute an approximation from the numbers you typed. Use them to reason about a trade before you place it.
Start here if you are new
Read what a TradFi perpetual actually is first, then the checklist to run before the first trade. Of the five tools, the position size planner is the one to use before anything else. The dated 29 August contract archive is at the 2026 list; check newer announcements separately.
These pages are educational information, not investment advice, and this site is not operated by, affiliated with or endorsed by Binance.