A cumulative update
USD 20,000 at approved 60% gives USD 12,000 cumulative value. USD 8,000 previously billed leaves USD 4,000 additional value to review, not a new USD 12,000 request.
Project billing
Free Percentage Completion Invoice Calculator
Use a documented percentage-completion basis for one project. Calculate the cumulative value first, then compare previous billed subtotals, keeping unpaid earlier invoices outside the new progress calculation.
What you can do here
Compare a contract subtotal's approved cumulative completion value with prior billed subtotals to identify a current progress-billing difference.
Built for real invoice workflows
Confirm the completion evidence and approved billing basis before scheduling a progress invoice.
Preparing your calculator with today’s date…
Calculation notes
How the result is calculated
Cumulative value = reviewed project subtotal × approved completion percentage, rounded once to cents. Signed difference = cumulative value − previously billed subtotal. Show positive additional value and prior billing above the valuation separately. This is an entered simple percentage method, not measured completion, revenue recognition, certification, retention, tax or advance allocation.
Formulas and examples reviewed October 2, 2026. Illustrative figures; no tax or contractual determination.
Prior billed value exceeds the new valuation
The same USD 12,000 cumulative value compared with USD 13,000 billed gives USD −1,000 signed difference and zero additional positive value. Investigate the basis; do not create an automatic credit.
Questions about this calculation
Should confirmed cash be entered as previously billed?
No. Use billed subtotals under this project basis. Payment status of earlier invoices remains a separate reconciliation.
Does the tool approve the completion percentage?
No. Supply evidence and the approval required by your agreement. The arithmetic does not certify work or decide a recognized revenue amount.
Sources and further reading
How to use it
1
Enter the reviewed project subtotal and approved cumulative completion percentage.
2
Enter previously billed subtotals on the same basis, not amounts received.
3
Review any previous billing above the cumulative value before drafting a new charge.
Why it helps
Avoid billing the full cumulative value again.
Separate already-billed work from unpaid receivables.
Expose a negative progress difference for review.
Next step
From free tool to live invoice workflow.
Use the result when creating your invoice in InvoiceAgent. Planner setup links carry the settings they describe into a draft. Review your dates, amounts, PDF, and reminder settings before scheduling.
Related workflows
Move from the quick answer into the rest of the invoice system.
Record the cumulative reconciliation
Record the cumulative reconciliation
Show approved progress, earlier bills and the current difference.
Review completion evidence
Review completion evidence
Check the approval basis and prior billed references.
Invoice templates
Invoice templates
Use the result inside invoice formats that are ready for clients and easier to automate.
Knowledge base
Knowledge base
Review the billing concepts behind the numbers before they go onto a live invoice.
Profession pages
Profession pages
See how freelancers, consultants, and agencies apply the same calculator output in different workflows.