To keep track of billable hours, record time against a client and task as you work. Use a timer or automatic capture. Review entries daily, separate billable from non-billable work, and invoice from approved entries.
Quick Answer
How do you keep track of billable hours? Log each block of work against a client and task while you do it. Review the log daily. Mark billable versus non-billable. Invoice only from approved entries.
Missed minutes add up fast. A consultant at £200/hour who forgets 30 minutes a day loses over £25,000 a year. The method matters less than the habit: capture as you work, not from memory on Friday.
How do you keep track of billable hours?
Use a short daily routine. It works with a spreadsheet, a timer app, or automatic capture.
- Start a timer (or open today’s log) when you begin client work.
- Tag the client and task before you switch context.
- Stop or split the entry when the task changes.
- Review at the end of the day while the work is still fresh.
- Approve and invoice from the cleaned list, not from memory.
If you need the maths behind rates and totals, see how to calculate billable hours. For the line between chargeable and internal work, separate billable and non-billable hours before you send the invoice.
What are the 7 methods for tracking billable hours?
Pick the lightest method your clients will still trust on an invoice.
| Method | Accuracy | Effort | Best for |
|---|---|---|---|
| Spreadsheet log | Medium | High | Solo, few clients |
| Paper timesheet | Low | High | Field work with no device |
| Manual timer app | High | Medium | Most freelancers |
| Calendar reconstruction | Low–medium | Medium | Meeting-heavy days |
| Automatic desktop capture | High | Low | Knowledge workers at a desk |
| Project tool time fields | Medium | Medium | Teams already in one PM tool |
| Hybrid human + AI agent log | High | Low–medium | Teams that bill agent work |
1. Spreadsheet log. Columns for date, client, task, start, end, duration, and rate. Free and flexible. Breaks down beyond a few clients. For a one-off shift total, use the free hours calculator.
2. Paper timesheets. Zero tech. Slow to invoice and easy to lose.
3. Manual timer app. One-click start/stop with client and project tags. Strong for most solo and small-team billing.
4. Calendar reconstruction. Build the day from meetings and blocks. Useful as a backup when you forgot to track time, not as the primary method.
5. Automatic desktop capture. Background logging of apps and documents, then review. Cuts forgotten minutes.
6. Project tool time fields. Log hours inside the tool you already use for tasks. Fine if everyone fills them in; weak if the timer is buried.
7. Hybrid human + AI agent log. Track people and agent sessions on one timesheet with clear costs. Needed once agents do billable client work.
Many firms still bill in six-minute units. Use the 6-minute billing increments chart when you convert minutes to tenths of an hour.
What should a billable hours tracker include?
A useful billable hours tracker needs more than a start/stop button.
- Client and project tags on every entry
- Billable / non-billable flag with sensible defaults
- Rates by person, role, or service
- Daily and weekly review views
- Approval before invoicing
- Export or invoice hand-off so you do not retype hours
- Mobile or desktop capture that matches how you work
Without tags and approval, the log becomes a private diary. Clients challenge vague lines. For what billable hours are in plain terms, start there, then lock the tracker fields your invoices need.
How do you stop forgetting billable time?
Most leakage is not “wrong rates”. It is work that never made it onto the timesheet.
- Start the timer before you open the first client file.
- Split entries when you switch tasks, even for ten minutes.
- Review before you shut the laptop, not on Monday morning.
- Keep a short “parking lot” note for calls you need to log later.
- After a crash or sync failure, recover lost time tracking data from git, calendar, and email instead of guessing.
If Friday reconstruction is already normal, change the tool or the rule. Memory is the weakest tracker you have.
How do you track AI agent billable hours?
Treat agent work like any other billable delivery: what ran, how long, what it cost, and what the client got.
- Define billable agent work with the client (delivery yes; pure retries maybe no).
- Log sessions automatically with start/end, tokens or compute cost, and outcome.
- Show a human-readable line on the invoice or report.
- Pick a pricing model (cost-plus, reduced human rate, per-task, or outcome) and stick to the data.
With Keito, CLI agent mode can record sessions, and agent integration tags entries source=agent with token costs as expenses.
Key Takeaway
Capture time as you work, review it daily, and invoice only from approved entries.
Ready to stop losing billable time?
Keito captures billable work automatically and turns it into invoices.
Frequently Asked Questions
What is the easiest way to keep track of billable hours?
Use a one-click timer or automatic capture tagged to the client and task. Review the list at the end of each day. Invoice from approved entries only.
How do you keep track of billable hours in Excel?
Create columns for date, client, task, start, end, duration, rate, and amount. Fill rows as you work, not from memory later. Spreadsheets work for a few clients; move to a timer when the grid gets messy.
What should a billable hours tracker include?
Client and project tags, a billable flag, rates, review views, approval, and an invoice or export path. Without those, the log will not survive a client dispute.
How often should you record billable time?
Record in real time as you work. Review daily. Approve and invoice on a weekly or fortnightly cycle so little time sits unbilled.
Can billable hours be tracked automatically?
Yes. Automatic capture logs activity in the background, then you confirm the client and billable flag. It still needs a short human review before invoicing.