To calculate the percentage of work completed in construction, divide the work that has been finished by the total planned work, then multiply by 100. The formula is: (Completed Work / Total Planned Work) × 100 = Percentage Complete.
The method you use depends on your tracking system. By tasks: Count finished tasks against all scheduled tasks. If 6 of 15 major tasks are done, that's 40% complete. By budget: Compare actual costs spent to the total project budget. If $500,000 has been spent of a $1 million budget, the project is 50% complete by cost. By time: Calculate elapsed time against the full schedule. If 8 weeks have passed of a 16-week project, that's 50% by timeline (though this assumes even progress). By physical progress: Estimate the percentage of actual physical work visible on-site, which often requires on-site inspection and professional judgment.
Most construction projects use a weighted approach combining multiple methods. For example, assign percentages to major phases—site preparation 10%, foundation 15%, framing 25%, MEP systems 20%, finishes 20%, final inspections 10%—then track each phase's completion separately. This prevents overestimating progress early and underestimating later.
For accuracy, document completed milestones with dates, photos, and inspector sign-offs. Many construction teams use project management software that tracks planned vs. actual progress automatically. Keep in mind that percentage complete and percentage of time elapsed often diverge; a project might be 70% complete but only halfway through its timeline if early phases proceeded faster than expected.