Perpetual Funding Rate Calculator
Perpetual futures use a funding rate to tether the contract price to spot. Holders pay or receive a small amount every funding interval, and over many intervals this becomes a meaningful cost or income. This calculator takes your notional position size, the per-interval funding rate, and the number of intervals per day, then computes the payment per interval, the daily funding, and the annualized funding rate and cost on your notional. The rate is exchange-specific and changes each interval, so you enter the current value.
Funding rate formula
Payment per interval = notional * (rate / 100)
Daily funding = payment per interval * intervals per day
Annualized rate % = rate * intervals per day * 365
Annual funding = notional * (annualized rate / 100)
A positive rate means longs pay shorts. Reported figures are the magnitude of funding; the sign depends on whether you are long or short relative to the rate.
Things to know
- Funding rate is exchange-specific and recomputed each interval; take the live figure from the venue.
- Common schedules use three eight-hour intervals per day, but some venues differ.
- Persistent funding against your position erodes margin and can hasten liquidation.
- Funding can be income for the side that receives it, used in cash-and-carry strategies.
- This tool shows funding cost only, not price profit and loss or liquidation.
Funding rate: frequently asked questions
What is a funding rate on perpetual futures?
A funding rate is a periodic payment exchanged between long and short holders of a perpetual futures contract to keep its price near the underlying spot price. When the rate is positive, longs pay shorts; when negative, shorts pay longs. It is charged each funding interval, often every eight hours.
How is a funding payment calculated?
A single funding payment equals your position notional value times the funding rate for that interval. Notional value is contracts or position size times the mark price. If you hold a long position when the rate is positive, you pay that amount; if you hold a short, you receive it.
How do I annualize a funding rate?
Multiply the per-interval rate by the number of intervals per day, then by 365. With three eight-hour intervals per day, an annualization factor of 3 times 365, or 1,095, converts a per-interval rate into an approximate annual percentage. This calculator reports the annualized rate and annual cost on your notional.
Where does the funding rate come from?
Each exchange computes its own funding rate from the gap between the contract's mark price and an index of spot prices, plus an interest component. It changes every interval and differs by venue. Take the current rate from the exchange and enter it; it is not a fixed constant.
Does funding affect my liquidation risk?
Indirectly. Funding payments debit or credit your margin balance each interval. Persistent funding payments against your position erode margin and can bring liquidation closer, separate from price moves. This tool shows the funding cost but does not compute liquidation.
Official sources
- U.S. Commodity Futures Trading Commission: CFTC on derivatives and digital assets.
- U.S. Securities and Exchange Commission: Investor.gov on crypto assets.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.