Abstract: A method of estimating a capacitance of each resource in a programmable logic device (PLD) is described. The current drawn by a reference circuit implemented in the PLD is measured at a given frequency and operating voltage. The capacitance of the reference circuit is calculated using the current drawn, the frequency, and the operating voltage. The current drawn by a resource load coupled to the reference circuit is measured at the given frequency and operating voltage. The capacitance of the resource load coupled to the reference circuit is calculated using the current drawn, the frequency, and the operating voltage. The capacitance of the resource load may be calculated by subtracting the capacitance of the reference circuit from the capacitance of the resource load coupled to the reference circuit.