Short Borrow Cost - Rate × Notional × Days

Risk disclaimer

Rates and day-count follow the venue; borrow rates can spike in stress.

Shorts borrow coins first and pay interest daily while holding — longer holding and higher rates cost more.

The annual rate comes from the venue and moves over time and by asset.

Notional 10,000 at 8% for 30 days → daily ≈ 2.19, total ≈ 65.75.

Cost eats short profits — more so the longer you hold.

Same for leveraged shorts?

Notional is the actual borrowed value; leverage affects margin, not the borrow rate.

Pair with the funding cost and net-P&L tools.

Estimate open, close and total trading fees for a futures position from prices, quantity and the fee rate.

Estimate single and cumulative funding fees for a perpetual position from position value, funding rate and holding periods.

Estimate notional value and the hidden slippage cost of a market order from quantity, price and expected slippage %.

Enter direction, entry/exit price, quantity, fee rate and funding % to get net PnL after fees and funding.

Convert a per-period funding rate and periods per day into nominal and compounding-equivalent annualized rates.

From monthly volume, round-trip fee rate and capital, estimate monthly/annual costs as % of capital.