The Crypto Funding Rate Cost Calculator turns a perpetual futures funding rate into the real money it costs to hold a position. It shows the payment per funding interval, the daily total, and the annualised APR, and tells you whether you pay or receive funding.
How it works
A perpetual swap has no expiry, so exchanges use funding to keep its price anchored to spot. At each funding interval, traders on one side pay the other:
Funding payment = position notional × funding rate
When the rate is positive, longs pay shorts; when negative, shorts pay longs. The payment is charged on the full notional value, so leverage magnifies its impact on your margin.
Annualising the rate
To compare funding to other yields, annualise it by multiplying by the number of intervals per year:
APR = funding rate × intervals per day × 365
With 8-hour funding there are 3 intervals per day, so 1095 per year. A steady
0.01% rate therefore costs roughly 0.01% × 1095 = 10.95% per year — a real
drag on a held long, or a real yield for a held short.
Example and notes
Holding a $50,000 long at a 0.01% 8-hour rate costs 50000 × 0.0001 = $5 per
interval, $15 per day, and about $5,475 annualised. Funding rates change
every interval, so treat the APR as a snapshot. Carry traders deliberately hold
the side that receives funding, but they take on price risk to earn it.