Current market price of the asset (e.g., BTC/USDT).
Amount of the cryptocurrency you hold in the contract.
Current funding rate shown on Bybit (usually every 8 hours).
Long (Buy)
Short (Sell)
Total Position Value:–
Fee per Interval (8h):–
Projected Daily Fee (24h):–
Projected Weekly Fee (7d):–
Flow Direction:–
function calculateFunding() {
var price = parseFloat(document.getElementById('assetPrice').value);
var size = parseFloat(document.getElementById('positionSize').value);
var rate = parseFloat(document.getElementById('fundingRate').value);
var side = document.getElementById('positionSide').value;
if (isNaN(price) || isNaN(size) || isNaN(rate)) {
alert("Please enter valid numerical values for Price, Size, and Rate.");
return;
}
// 1. Calculate Position Value
var positionValue = price * size;
// 2. Calculate Funding Fee per 8h interval
// Formula: Position Value * (Rate / 100)
var fee8h = positionValue * (rate / 100);
// 3. Absolute value for display magnitude
var absFee8h = Math.abs(fee8h);
// 4. Extrapolate
var fee24h = absFee8h * 3;
var fee7d = absFee8h * 21; // 3 times a day * 7 days
// 5. Determine Payment Direction
// If Rate is Positive (+): Longs pay Shorts
// If Rate is Negative (-): Shorts pay Longs
var directionText = "";
var isPayer = false;
if (rate > 0) {
if (side === 'long') {
directionText = "You PAY the fee (Rate is Positive)";
isPayer = true;
} else {
directionText = "You RECEIVE the fee (Rate is Positive)";
isPayer = false;
}
} else if (rate < 0) {
if (side === 'short') {
directionText = "You PAY the fee (Rate is Negative)";
isPayer = true;
} else {
directionText = "You RECEIVE the fee (Rate is Negative)";
isPayer = false;
}
} else {
directionText = "No funding fees (Rate is 0%)";
}
// 6. Display Results
document.getElementById('resPosValue').innerHTML = positionValue.toLocaleString('en-US', { style: 'currency', currency: 'USDT' });
var prefix = isPayer ? "-" : "+";
var color = isPayer ? "#d32f2f" : "#388e3c";
document.getElementById('resFee8h').innerHTML = "" + prefix + absFee8h.toLocaleString('en-US', { style: 'currency', currency: 'USDT' }) + "";
document.getElementById('resFee24h').innerHTML = absFee8h === 0 ? "$0.00" : (prefix + fee24h.toLocaleString('en-US', { style: 'currency', currency: 'USDT' }));
document.getElementById('resFee7d').innerHTML = absFee8h === 0 ? "$0.00" : (prefix + fee7d.toLocaleString('en-US', { style: 'currency', currency: 'USDT' }));
document.getElementById('resDirection').innerHTML = directionText;
document.getElementById('results').style.display = 'block';
}
Understanding Bybit Funding Rates
In the world of perpetual futures trading, specifically on platforms like Bybit, the funding rate is a critical mechanism used to tether the contract price to the spot price of the underlying asset. Unlike traditional futures contracts that have an expiry date, perpetual contracts can be held indefinitely. The funding fee ensures that the price of the perpetual contract does not deviate significantly from the spot price.
How the Calculator Works
This Bybit Funding Rate Calculator helps traders estimate the potential costs or rebates associated with holding a position over time. The calculation is based on three primary factors:
Position Value: Calculated as your Entry Price multiplied by your Position Quantity (in coins).
Funding Rate: The percentage fee exchanged between long and short traders. Bybit typically settles this every 8 hours.
Position Side: Whether you are Long (betting price goes up) or Short (betting price goes down) determines if you pay or receive the fee.
The Funding Formula
The core formula used in this calculator is:
Funding Fee = Position Value × Funding Rate
For example, if you hold a position worth 10,000 USDT and the funding rate is 0.01%, the fee for that 8-hour interval is 1 USDT.
Who Pays Whom?
Funding rates can be positive or negative, dictating the direction of payment:
Positive Rate (+): Traders holding Long positions pay traders holding Short positions. This usually happens when the market is bullish.
Negative Rate (-): Traders holding Short positions pay traders holding Long positions. This usually occurs during bearish market trends.
Why Calculate Funding Fees?
While a 0.01% fee might seem negligible, it occurs every 8 hours (3 times a day). Over time, especially with high leverage, these fees can significantly impact your profit and loss (PnL). A high positive funding rate can eat into the profits of a long position, while a negative rate can provide a steady income stream for long holders (often called "funding arbitrage").
Use this tool before entering a trade to understand your holding costs, or use it to plan funding rate arbitrage strategies effectively.