Tools
Funding rate calculator for perpetual contracts
Position size, rate and holding time in — the number of payments, the amount per payment, the total and the annualized cost out. It assumes a constant rate: the real one changes every interval.
How funding works
Funding is a periodic payment between the longs and shorts of a perpetual contract that keeps its price close to spot. With a positive rate longs pay shorts, with a negative one shorts pay longs. The exchange takes no cut: the money moves from one side to the other.
The payment is calculated on position value, not on margin, so leverage does not affect it: a $10,000 position pays the same at 2× and at 20×.
Formulas
Payments = ⌊holding hours ÷ interval⌋, where the interval is 8, 4 or 1 hour depending on the exchange and the instrument. Amount per payment = position value × rate. Total = amount × number of payments. Annualized = rate × (24 ÷ interval) × 365.
Example
A long of $10,000, rate +0.01% per 8 hours, held for 3 days, that is 72 hours. Payments: 72 ÷ 8 = 9. Amount per payment: 10,000 × 0.0001 = $1. Total −$9: the long pays. Annualized: 0.01% × 3 × 365 = 10.95% of position value.
A short in the same conditions would receive +$9. A rate below zero flips it: shorts pay.
Why this is an estimate
The calculator takes one constant rate. The real one is recalculated by the exchange every interval and can change sign, and each payment is based on your position at that moment: close before a payment and you neither pay nor receive. Check the current rate and payment times on your exchange.
Frequently asked questions
- What is a funding rate?
- A periodic payment between the longs and shorts of a perpetual contract that keeps its price close to spot. It is paid or received by traders, not by the exchange.
- Who pays funding when the rate is positive?
- Longs pay shorts. With a negative rate it is the other way round: shorts pay longs.
- How do I calculate funding for a day?
- Multiply position value by the rate and by the number of payments per day: with an 8-hour interval there are three. A $10,000 position at 0.01% gives 10,000 × 0.0001 × 3 = $3 a day.
- Does funding depend on leverage?
- No. It is calculated on position value. Leverage only changes the margin behind the position, and with it the share of your capital that funding takes.
- Why does the total differ from what I actually paid?
- The rate changes every interval and the calculator holds it constant. For an exact sum, use the payment history on your exchange.
Funding and fees inside a trade's result
The Trading OS journal computes trade results in money and in R with costs included, so you can see what holding a position really costs.
No sign-up: the journal runs in your browser. An account keeps your trades on the server.