Perpetual funding calculator: position size, funding rate and what you pay each time
Perpetual futures charge funding every few hours. Enter your position and see who pays whom, and how much.
How it works: a perpetual contract has no end date. Funding keeps its price close to the spot price. At each payment time one side pays the other. When the rate is above zero, longs pay shorts. When it is below zero, shorts pay longs. The payment is the position's dollar size times the rate. This page rounds each payment to the cent. It counts the payment times you hold through, which is the hours held divided by the hours between payments, rounded down.
The fee you never see on the chart
Funding is not a trading fee. It goes from one trader to another. A rate of 0.01% looks tiny. On a big position it adds up every eight hours. A long that sits in a positive rate pays all day, whether the trade is up or down. The idea is in the funding rate and perpetual futures.
Size is the dollar size
The payment uses the full size of the position, not your margin. Ten times leverage does not shrink it. The usual mix-up is to apply the rate to the money you put up. See perpetual versus quarterly futures, and check the danger line with the crypto liquidation calculator.
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