The swap calculator tells you the exact overnight financing cost (or credit) for holding a forex position past the daily rollover time. Swap rates are based on the interest rate differential between the two currencies in a pair. Some positions earn positive swap (swap credit), while most cost money (swap debit). Traders who hold positions for days or weeks — swing traders and carry traders especially — must account for swap fees because they can significantly erode profits on longer-duration trades.
This free swap / rollover calculator works directly in your browser — no download, no registration, and no delay. All calculations are performed client-side, so your trading data is never transmitted to a server.
The formula used is: Swap = Lot Size × Contract Size × Swap Rate × Days / 360. This is the same formula used by professional traders and institutional risk managers worldwide.
Supported asset classes include: Forex. Each asset class applies the correct unit conventions so results are always accurate regardless of the market you are trading.