Funding rate cost calculator
See what holding a perpetual futures position costs in funding, for a rate, an interval and a number of days.
Read this first. Leveraged crypto products can lose your entire margin, and many regulators restrict or ban them for retail clients. This page is arithmetic on the numbers you enter, not advice or a signal.
Educational arithmetic from the numbers you enter. It is not investment advice or a signal, and it does not model exchange tiers, funding, partial liquidation or auto-deleveraging. Your exchange's position panel is the binding figure. Calculations run in your browser; nothing you type is sent or stored.
How it works
Perpetual futures have no expiry, so exchanges use a funding payment to keep the contract price near the spot price. At each funding time, one side pays the other an amount equal to the position value multiplied by the funding rate. When the rate is positive, longs pay shorts. When it is negative, shorts pay longs.
Funding paid = position value × rate × (24 ÷ interval in hours) × days
Annualised, simple = rate × (24 ÷ interval) × 365
Because funding is charged on the position value and not on your margin, leverage multiplies its weight: the same payment is ten times larger as a share of the margin at 10x. The calculator assumes the rate stays constant. Real rates move from one interval to the next and can change sign.
Worked example
The page opens with a long position worth 10,000 and a funding rate of 0.01% every 8 hours, held for 30 days. That is 3 payments a day and 90 in total, each about 1.00, so 90.00 in all, which is 0.90% of the position. Annualised, 0.01% three times a day is 10.95% a year. At 10x leverage, 0.90% of the position is 9.0% of the margin.
What different rates cost over 30 days
| Rate per 8 hours | 30 days, % of position | 30 days, % of margin at 10x | Per year, simple |
|---|---|---|---|
| 0.005% | 0.45% | 4.5% | 5.48% |
| 0.01% | 0.90% | 9.0% | 10.95% |
| 0.03% | 2.70% | 27.0% | 32.85% |
| 0.05% | 4.50% | 45.0% | 54.75% |
| 0.1% | 9.00% | 90.0% | 109.50% |
A rate of 0.01% looks harmless on its own. It is also the level many exchanges use as a baseline, so a long position in a flat market often pays roughly 11% a year before any price move. The yearly effect is explained in what funding rates cost per year.
Questions
Who pays funding, longs or shorts?
In most perpetual contracts a positive rate means longs pay shorts and a negative rate means shorts pay longs. The sign convention is the same on the large exchanges, but check yours.
Do I pay funding if I close the position before the funding time?
On most exchanges you pay or receive funding only if you hold the position at the moment the funding is applied. Closing a minute earlier avoids that payment.
Is the funding rate fixed?
No. It is recalculated from the gap between the contract and spot prices, and some exchanges change the interval when the rate is extreme. Use the calculator for scenarios with several rates.
Why show the cost as a share of margin?
Because the margin is the money you put up. A 0.9% cost on the position is small, but 9% of your margin at 10x is not.