How to Track Billable Time
Billable time is any time a client has agreed to pay for, including direct project work, client calls, research, and in-scope revisions. Tracking it accurately is the foundation of freelance billing: under-tracking means lost income; over-tracking risks disputes and damages the client relationship. This guide covers what counts as billable time, how to log it in real time, and how to convert your log into an accurate invoice.
- Billable time includes direct project work, client calls, research, and revisions within the agreed scope
- Log start and end times as they happen. Reconstructing from memory at end of day leads to underestimates
- Convert to decimal hours before invoicing: hours + (minutes ÷ 60), e.g., 3 hrs 30 min = 3.5 hrs
- Agree on a rounding increment (6, 15, or 30 minutes) with clients before starting work and apply it consistently
What Counts as Billable Time
- Direct project work
Writing, designing, coding, editing, or any deliverable work the client hired you for.
- Client calls and meetings
Any scheduled call or meeting related to the project. Log start and end time.
- Research and planning
Time spent researching, outlining, or planning work specific to the client's project.
- Revisions
Revisions requested by the client within the agreed scope are typically billable.
Non-billable time typically includes general admin, learning new skills, and internal meetings not related to the client's work. Clarify this in your contract before starting.
How to Log Time Accurately
Log as you go
Record start and end time for each task immediately. Reconstructing time at the end of the day leads to inaccurate estimates.
Use a simple format
Date, task description, start time, end time, total duration. Keep it consistent across all projects.
Calculate duration accurately
Use a time duration calculator to get exact hours and decimal hours for each entry instead of estimating.
Review before invoicing
Go through your log before sending an invoice. Check for gaps, overlaps, or entries that should be non-billable.
Rounding Methods
Most freelancers round time to the nearest increment. Common options:
6-minute increments (0.1 hr)
Most precise. Good for high-value hourly work.
15-minute increments (0.25 hr)
Common balance of simplicity and fairness.
30-minute increments (0.5 hr)
Simple. Better for longer tasks, not short calls.
Always disclose your rounding method to clients and apply it consistently. Rounding up on every entry, even small ones, adds up and creates billing disputes.
Converting a Time Log to an Invoice
Once you have all your logged hours, convert each entry to decimal hours, sum them up, and multiply by your rate. For example:
- Design work: 3 hrs 30 min = 3.5 hrs
3.5 × $80 = $280
- Client calls: 1 hr 15 min = 1.25 hrs
1.25 × $80 = $100
- Revisions: 2 hrs 0 min = 2.0 hrs
2.0 × $80 = $160
Total: 6.75 hrs × $80 = $540.00
Common Mistakes to Avoid
- Logging time from memory
Memory is unreliable for short tasks. Even 5 minutes of error per task adds up across a full project.
- Not logging calls and meetings
A 20-minute check-in call is billable time. Log it the same as any other task.
- Using HH:MM instead of decimal hours on invoices
Clients may not immediately understand "3:45" on an invoice. Use decimal hours (3.75) so the math is transparent.
- Not separating projects
If you work for multiple clients in a day, keep separate logs. Mixing entries leads to billing errors.
Related Guides
- What Are Decimal Hours?
A full breakdown of the decimal hour format used in invoicing, with a conversion table and the formula explained.
- How to Calculate Overtime Hours
If you work with employees or contractors, this guide covers daily and weekly overtime formulas and pay calculations.
Frequently Asked Questions
What counts as billable time?
Billable time is any time spent directly on work a client has agreed to pay for. This typically includes research, writing, design, development, revisions, calls, and meetings related to the project. Administrative tasks like invoicing are usually non-billable unless the contract specifies otherwise.
How should I round billable time?
Common rounding methods are to the nearest 6 minutes (0.1 hour), 15 minutes (0.25 hour), or 30 minutes (0.5 hour). The method should be agreed on with the client upfront and applied consistently.
How do I convert my time log to an invoice?
Add up all billable hours, convert to decimal hours, then multiply by your hourly rate. For example, 6 hours 30 minutes = 6.5 decimal hours. At $75/hr: 6.5 × $75 = $487.50.
Should I bill for short tasks under 5 minutes?
This depends on your contract and relationship with the client. Many freelancers apply a minimum billing increment (such as 15 minutes) for any task. Disclose this upfront to avoid disputes.