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Calculate what a perpetual futures position pays or earns in funding per interval, per day, and over your holding period.
Perpetual futures use periodic funding payments to keep the contract price tied to spot. Each interval (typically every 8 hours, three times per day) one side pays the other: when the rate is positive, longs pay shorts; when negative, shorts pay longs. The payment is the funding rate applied to your position's notional value, not your margin.
Payment per interval = Position notional × Funding rate %
Daily cost = Payment per interval × Intervals per day
Total cost = Daily cost × Days held
Annualized rate % = Funding rate % × Intervals per day × 365The calculator assumes a constant rate and notional; in reality the rate is recalculated every interval. Small rates compound: 0.01% per 8-hour interval is roughly 11% per year on the notional, which matters for leveraged positions held long term.