Traders using perpetual futures contracts on exchanges like Binance need to be acutely aware of funding rates. Unlike traditional futures which have an expiry date, perpetual contracts never expire. To ensure the contract price stays tethered to the spot price of the underlying asset, exchanges utilize a Funding Rate mechanism.
This calculator helps you determine exactly how much you will pay or receive based on your position size and the current funding interval rate.
How the Calculation Works
The funding fee is calculated based on the total notional value of your position (Margin × Leverage), not just your initial margin.
Funding Fee = Position Notional Value × Funding Rate
For example, if you have $1,000 in margin and use 10x leverage, your Position Notional Value is $10,000. If the funding rate is 0.01%, the calculation is:
10,000 USDT × 0.0001 = 1 USDT per interval.
Who Pays Whom?
The direction of payment depends on whether the funding rate is positive or negative and whether you are holding a Long or Short position.
Positive Funding Rate (> 0%): Longs pay Shorts. This usually happens when the market is bullish.
Negative Funding Rate (< 0%): Shorts pay Longs. This usually happens when the market is bearish.
Impact of Annualized Yield
While a 0.01% fee every 8 hours seems small, it compounds. Since there are three 8-hour intervals in a day, the daily rate is roughly 0.03%. Over a year (365 days), this translates to:
Daily Rate: 0.03%
Annual Rate (APR): 10.95%
High volatility periods can see funding rates spike to 0.1% or higher per interval, which equates to over 100% APR, making it expensive to hold positions long-term.
Using This Tool for Cash and Carry Arbitrage
Advanced traders use this calculator for "Cash and Carry" trades. If the funding rate is consistently positive, a trader can buy the spot asset and open a Short position of equal value in futures. This neutralizes price risk while allowing the trader to collect the funding fees paid by Long traders.
function calculateFunding() {
// 1. Get input values
var sizeInput = document.getElementById('positionSize').value;
var rateInput = document.getElementById('fundingRate').value;
var side = document.getElementById('positionSide').value;
// 2. Validate inputs
if (sizeInput === "" || rateInput === "") {
alert("Please enter both Position Size and Funding Rate.");
return;
}
var size = parseFloat(sizeInput);
var ratePercent = parseFloat(rateInput);
if (isNaN(size) || isNaN(ratePercent)) {
alert("Please enter valid numbers.");
return;
}
// 3. Calculate Fee Amount (Absolute)
// Formula: Size * (Rate / 100)
var feeRaw = size * (ratePercent / 100);
var feeAbs = Math.abs(feeRaw);
// 4. Determine Pay vs Receive Logic
// Positive Rate: Long pays Short
// Negative Rate: Short pays Long
var userAction = ""; // "You Pay" or "You Receive"
var statusClass = "";
if (ratePercent > 0) {
if (side === 'long') {
userAction = "PAYING";
statusClass = "pay";
} else {
userAction = "RECEIVING";
statusClass = "receive";
}
} else if (ratePercent < 0) {
if (side === 'long') {
userAction = "RECEIVING";
statusClass = "receive";
} else {
userAction = "PAYING";
statusClass = "pay";
}
} else {
userAction = "NEUTRAL";
statusClass = "";
}
// 5. Calculate Timeframes
var fee8h = feeAbs;
var fee24h = feeAbs * 3; // 3 intervals per day usually
var feeYear = fee24h * 365;
// Calculate APR Percentage
// (Rate * 3 * 365)
var aprRaw = Math.abs(ratePercent) * 3 * 365;
// 6. Display Results
var resultsDiv = document.getElementById('results');
resultsDiv.style.display = "block";
var statusDiv = document.getElementById('payReceiveStatus');
if (statusClass) {
statusDiv.innerHTML = "Status: You are " + userAction + " fees";
} else {
statusDiv.innerHTML = "Status: No fees (0% Rate)";
}
document.getElementById('feePerInterval').innerText = fee8h.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 }) + " USDT";
document.getElementById('feeDaily').innerText = fee24h.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 }) + " USDT";
document.getElementById('feeYearly').innerText = feeYear.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 }) + " USDT";
document.getElementById('aprPercentage').innerText = aprRaw.toFixed(2) + "%";
}