Perpetual Funding Cost Calculator
What a holding window costs in perpetual funding. Inputs: size, mark price, live funding rate. Output: total paid or received across N 8h cycles.
Live rate unavailable8H CYCLE
Period: every 8h · 00:00 / 08:00 / 16:00 UTC
Enter position and funding rate
How it works
Perpetual funding formula
Perpetual futures have no expiry. Instead, funding payments keep the perp price anchored to the spot price. Every 8 hours (00:00 / 08:00 / 16:00 UTC), longs pay shorts when the rate is positive — and receive from shorts when it is negative.
Notional = Size × Mark Price
Funding / Period = Notional × Rate
Periods = Hold Hours ÷ 8
Total Cost = Funding/Period × Periods
Positive rate + long position = you pay. Negative rate + long position = you receive.
Cost reference
Funding cost at $9,420 notional
(0.1 BTC × $94,200 mark price). Rate is the per-period rate; costs scale linearly with notional and holding time.
Rate / periodPer dayPer week
0.005%$1.41$9.89
0.01%$2.83$19.78
0.03%$8.48$59.35
0.1%$28.26$197.82