Calculator inputs
Use business hours for operational timing or calendar mode for total elapsed time.
Saved calculation history
Each new run stores a recent row for comparison and export.
| Invoice | Customer | Mode | Turnaround Hours | Target Hours | SLA | Due Status | Amount |
|---|---|---|---|---|---|---|---|
| No saved calculations yet. Submit the form to build history. | |||||||
Example data table
| Invoice | Customer | Issued | Completed | Mode | Hold Hours | Turnaround Hours | Target |
|---|---|---|---|---|---|---|---|
| INV-1001 | Northwind Retail | 2026-03-01 09:00 | 2026-03-02 13:00 | Business | 2.00 | 10.00 | 24.00 |
| INV-1002 | Brightlane Foods | 2026-03-03 10:00 | 2026-03-05 16:30 | Calendar | 3.00 | 51.50 | 48.00 |
| INV-1003 | Atlas Wholesale | 2026-03-04 08:30 | 2026-03-04 17:15 | Business | 0.50 | 8.25 | 12.00 |
| INV-1004 | Harbor Systems | 2026-03-05 11:00 | 2026-03-08 14:00 | Business | 4.00 | 15.00 | 16.00 |
Formula used
Core equations
- Raw elapsed time = Completion time − Issue time
- Business time = Sum of eligible working-minute overlaps
- Adjusted turnaround = Base time − Approval hold − Dispute hold
- Turnaround days = Adjusted hours ÷ Workday hours or 24
Performance metrics
- SLA variance = Actual turnaround hours − Target hours
- Amount per hour = Invoice amount ÷ Turnaround hours
- Efficiency score = Target hours ÷ Actual hours × 100
- Overdue variance = Completion time − Due time
Business mode excludes weekends and listed holidays unless you choose otherwise. Calendar mode measures full elapsed time without workday filtering.
How to use this calculator
- Enter the invoice number, customer, amount, and completion stage.
- Choose the issue time, completion time, and optional due time.
- Select business hours or calendar time for the timing method.
- Set workday start, workday end, weekends, and any holiday dates.
- Add approval or dispute hold hours to remove paused periods.
- Enter a turnaround target to compare actual performance against SLA.
- Pick the output unit and press the calculate button.
- Review the result panel, saved history, and export the output if needed.
Frequently asked questions
1. What does invoice turnaround time measure?
It measures the time from invoice issue to the selected completion event, such as payment received or approval completed. It helps teams track billing speed and uncover process delays.
2. When should I use business hours mode?
Use business hours mode when operational reporting should ignore nights, excluded weekends, and listed holidays. It is useful for internal workflow measurement and SLA tracking.
3. What is the difference between raw and adjusted time?
Raw time is the full elapsed duration between issue and completion. Adjusted time removes hold periods like approval waits or dispute pauses for a cleaner process view.
4. Why add a due date?
A due date lets you compare completion timing against commitment. The calculator flags whether the invoice finished early, late, or exactly on time.
5. What does efficiency score show?
The efficiency score compares target hours with actual turnaround hours. Higher values indicate faster completion relative to target, while lower values show slower processing.
6. Can I export the results?
Yes. The page includes CSV and PDF download options for the result summary and saved history table, making it easier to share reports or archive outcomes.
7. What if my process spans several invoices?
Run the calculator for each invoice and use the saved history section for quick comparison. This works well for spotting recurring delays across customers or teams.
8. Can I use this for collections reporting?
Yes. Track completion stages like payment received or collections closed. It helps sales and finance teams evaluate collections speed and overdue invoice handling.