Computer systems and methods for managing resources are described. In an aspect, a method includes: providing, to a client device, an intraday resource availability interface, the intraday resource availability interface including a resource usage graph for one or more accounts, the resource usage graph having a time axis including a time period that includes a day start time and a current time, the resource usage graph including a resource availability indicator indicating a total amount of resources over the time period, including borrowed resources, available for use in association with the one or more accounts, the intraday resource availability interface including one or more widgets configured to accept input to modify a parameter affecting the resource usage graph; and responsive to activation of the one or more widgets receiving, from the client device, a message requesting modification of the resource usage graph; generating a modified resource usage graph based on the request; and sending the modified resource usage graph to the client device for display thereon.