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Crypto Funding Rate Calculator

Estimate how much funding a perpetual futures position will pay or receive over a holding period. Plug in the rate from your exchange — BTC, ETH, SOL, anything.

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How perpetual funding works

Perpetual futures don't expire, so exchanges use a periodic funding payment to keep the perp price tethered to the underlying spot price. When the perp trades above spot, longs pay shorts. When it trades below spot, shorts pay longs. Most exchanges settle this every 8 hours (3× per day), though some use 1-hour or 4-hour intervals.

The math

cost per payment = position size × funding rate
total cost = cost per payment × payments in your holding period

On a $50,000 BTC long with a +0.01% funding rate (typical) at 8-hour intervals: each payment costs $5, that's $15/day, or about $450 over 30 days. Doesn't sound like much — until you're holding through a bull market when funding spikes to 0.1%+ and that same position is bleeding $4,500+/month.

When funding matters most

  • Long-duration trades. A 0.01% rate paid 90 times over 30 days adds up.
  • Crowded sides. When everyone's long BTC, funding spikes — you pay more for being on the popular side.
  • Annualized perspective. Multiply payments per day × 365 to compare against borrow costs or the risk-free rate.
  • Negative funding. Going short into positive funding (or long into negative funding) means you're *receiving* — turning the basis trade into yield.

Pair this with the calculator suite

Funding cost tells you what carrying a perp position will run you. The Position Size calculator tells you how much to put on. The Risk / Reward calculator tells you whether the setup is worth it.

Open Position Size calculator

Actual exchange charges can differ slightly due to mark price drift between funding intervals, tier discounts, and rounding. Funding rates change every interval — this calculation assumes the current rate holds for the full period.

MiyagiTrades tools are provided for educational and informational purposes only. They do not provide financial advice, trading signals, brokerage services, or trade execution. Verify all calculations against your broker, exchange, or trading platform before placing trades.