Estimate total and calendar hours for a DIY job.
Base hours combine each task's time with setup. Adding an overrun buffer gives a realistic total, divided by daily hours to forecast calendar days. Home projects almost always run over the naive estimate, so an explicit overrun buffer keeps the schedule honest.
Project Hours
Total hours = (tasks x hours each + setup) x (1 + overrun%)
Total hours = (tasks x hours each + setup) x (1 + overrun%) Base hours combine each task's time with setup. Adding an overrun buffer gives a realistic total, divided by daily hours to forecast calendar days.
Home projects almost always run over the naive estimate, so an explicit overrun buffer keeps the schedule honest.
This calculator takes 5 inputs: Number of tasks, Hours per task, Setup hours, Overrun allowance, Hours per day. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.