Funding Rate Calculator
Calculate the funding payment on a perpetual futures position from the position size and funding rate, with the annualized cost.
Last reviewed by the Radiatus Cloud team
Calculate the funding payment on a perpetual futures position.
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Calculate perpetual funding payments
Perpetual futures contracts use a funding rate to keep their price tethered to the underlying spot price. Periodically, usually every eight hours, traders on one side of the market pay those on the other based on this rate. This calculator works out the funding payment on your position from its size and the funding rate, and annualises the cost so you can see its true impact over time. A positive rate means long positions pay shorts, and a negative rate means the reverse.
The payment is simply the position size multiplied by the funding rate, charged each interval.
Why funding rates matter
Funding can quietly erode or boost returns on a leveraged position held over time. A funding rate that looks tiny per interval compounds into a large annualised figure, so holding a position against the prevailing funding direction becomes expensive. Traders watch funding rates both as a cost to manage and as a sentiment signal, since persistently high positive funding indicates crowded long positioning.
This calculation assumes a typical three-interval day; some venues use different schedules. All calculation happens locally in your browser.
Notes on these estimates
Because the funding rate calculator runs entirely in your browser, you can adjust every input and see the results update instantly, with nothing uploaded and no wallet connection required. The figures are estimates based on the values you enter, so use current, accurate numbers for the most useful output, and treat the results as a planning guide rather than financial advice.
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Frequently Asked Questions
What is a funding rate?
It is a periodic payment between long and short perpetual futures traders that keeps the contract price aligned with the spot price.
Who pays the funding?
When the rate is positive, longs pay shorts; when negative, shorts pay longs, depending on which way the contract trades relative to spot.
How is the payment calculated?
It is the position size multiplied by the funding rate for that interval, charged each funding period, usually every eight hours.
Why annualise the rate?
A small per-interval rate compounds across many intervals into a large yearly cost, so annualising reveals the true expense of holding a position.
Privacy & Security
Everything runs in your browser; nothing is uploaded.
How to Use
Enter the position size and the funding rate per interval.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.