# CryptoPerpCalc

> Free educational calculator for estimating position quantity, notional,
> initial margin, isolated liquidation price, liquidation distance, PnL, and
> ROI for linear USDT perpetual positions.

## Calculators

- [Main calculator](https://cryptoperpcalc.com/)
- [BTC/USDT calculator](https://cryptoperpcalc.com/btc-calculator)
- [ETH/USDT calculator](https://cryptoperpcalc.com/eth-calculator)
- [SOL/USDT calculator](https://cryptoperpcalc.com/sol-calculator)

## Implemented model

- `Initial Margin = Position Quantity × Entry Price ÷ Leverage`
- `Quantity = Margin USDT × Leverage ÷ Entry Price`
- Long liquidation estimate:
  `Entry Price × (1 - 1 ÷ Leverage + MMR)`
- Short liquidation estimate:
  `Entry Price × (1 + 1 ÷ Leverage - MMR)`

MMR is entered in the interface as a percentage. The calculator requires it to
be lower than the initial margin rate (`100 ÷ leverage` percent).

## Machine-readable access

Supporting browsers can discover the read-only WebMCP tool
`estimate_perpetual_position` on calculator pages.

## Important limitations

This is a simplified educational estimate, not financial advice. Actual
exchange values can differ because of fees, funding, maintenance-margin tiers,
maintenance deductions, extra margin, mark price, account mode, and other
exchange rules.

- [Formula reference](https://cryptoperpcalc.com/formulas.md)
- [Sitemap](https://cryptoperpcalc.com/sitemap.xml)
- [Full technical overview](https://cryptoperpcalc.com/llms-full.txt)
- [Source code](https://github.com/crypto-money-org/CryptoPerpCalc)