The same fifteen actual minutes
Seven and eight minutes at a 15-minute increment become 30 minutes when rounded separately, or 15 when combined first. At USD 120/hour, the illustrative subtotals are USD 60 and USD 30.
Time and capacity
Free Billable Time Rounding Calculator
An agreed billing increment can produce different totals depending on where rounding happens. Compare both methods before preparing billable time, while keeping the original logged minutes available for review.
What you can do here
Compare rounding three time entries up individually with rounding their combined minutes up once, using an increment you enter.
Built for real invoice workflows
Record the approved rounding method before converting reviewed time into invoice lines.
Preparing your calculator with today’s date…
Calculation notes
How the result is calculated
Entry method = sum of ceil(entry minutes ÷ increment) × increment. Combined method = ceil(total actual minutes ÷ increment) × increment. Zero stays zero. Each fee is rounded once to cents after multiplying its total minutes by the hourly rate ÷ 60. This compares upward rounding only; it does not recommend an increment or authorize a billable minimum.
Formulas and examples reviewed October 2, 2026. Illustrative figures; no tax or contractual determination.
Entries already on the increment
Two entries of 30 and 45 minutes at a 15-minute increment remain 75 minutes under either method. At USD 80/hour, both give USD 100.
Questions about this calculation
Does this choose a legally valid time policy?
No. Apply the method actually agreed for the service and any applicable requirements. The comparison does not authorize rounding or a minimum charge.
Why might my time report differ?
Check whether it shows original or rounded entries, the time format, the grouping and the configured rounding direction. A displayed total alone does not identify the method.
Sources and further reading
How to use it
1
Enter three whole-minute durations; use zero for an unused entry.
2
Enter the agreed upward rounding increment from 1–60 minutes.
3
Compare both minute totals and subtotals at the same hourly rate.
Why it helps
Expose the effect of entry-level rounding.
Retain actual minutes beside rounded billing time.
Separate a time policy from monetary line rounding.
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 agreed time policy
Record the agreed time policy
Keep increment, grouping, approval and original minutes visible.
Review the rounding decision
Review the rounding decision
Compare the source export with the billable result.
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.