Lost Billable Hours Calculator
Estimate how much revenue your business loses when manual timers, late timesheets and incomplete time records allow billable work to go unrecorded.
Calculate missed revenue
Your inputs are calculated on this page and are not submitted to Backlsh.
How the lost billable hours estimate works
The calculator starts with your available monthly billable capacity, estimates how much time is affected by incomplete tracking, and applies the portion that cannot be recovered later.
Potential billable hours
Employees × hours per day × working daysHours affected
Potential hours × non-compliance rateLost billable hours
Affected hours × unrecovered shareMissed revenue
Lost hours × average billable rateTimer non-compliance includes work recorded late, entered incompletely, assigned to the wrong project or never entered. The unrecovered percentage accounts for time that cannot be accurately reconstructed and invoiced.
How a 30-person software team can lose revenue quietly
A team with six expected billable hours per person, a blended rate of $75 and an 8% time-record compliance gap has 317 hours affected every month. If 40% cannot be recovered, approximately 127 billable hours—and $9,504 in monthly revenue—may be lost.
Read the COSO IT customer story →Why billable hours go unrecorded
Timers start late
Short calls, research and client messages are easy to overlook when recording depends on memory.
Timesheets are reconstructed
End-of-week estimates miss context and often understate the time actually spent on delivery.
Work is assigned incorrectly
Hours recorded against the wrong client or project become harder to validate and invoice.
Corrections arrive too late
By the time managers review incomplete entries, the employee may no longer remember the work accurately.
Billable-hours calculator FAQs
What are lost billable hours?
Client-service hours that could have been invoiced but were not recorded accurately enough to support billing.
How do I calculate missed revenue?
Multiply lost billable hours by your average billing rate. This calculator estimates lost hours from non-compliance and the unrecovered share.
What is a reasonable non-compliance rate?
There is no universal benchmark. Use your own audit data where possible and choose a conservative percentage you can explain.
Does automatic time tracking guarantee recovered revenue?
No. Capture can become more complete, but invoicing also depends on contracts, approval rules, utilization, team behavior and management processes.
Can I use this as a time-tracking ROI calculator?
Yes. Compare the annual impact with the annual cost of a system, including implementation cost and the share you realistically expect to recover.
Capture project time automatically
Give your team automatic timesheets and analytics that help recover productive capacity.