Track and calculate billable hours with hourly rates, project allocation, and client invoice summaries for consultants and lawyers.
This calculator logs individual time entries with a date, hours spent, hourly rate, and optional project, client, and description fields, then totals billable value per project and for the whole period. It also applies a tax rate and prepares a line-item breakdown suitable for client invoicing. The thing users most often get wrong is entering total elapsed time instead of billable hours: lunch breaks, internal meetings, and admin time must be subtracted before entry, or the invoice will overstate the client's obligation.
A concrete input and expected output from the current implementation.
Input
Project: Website Redesign | Client: Acme Corp | Date: 2025-06-02 | Hours: 3.5 | Rate: 150 | Description: Wireframe review and client call Project: Website Redesign | Client: Acme Corp | Date: 2025-06-03 | Hours: 2 | Rate: 150 | Description: Homepage mockup Project: Brand Guidelines | Client: Beta LLC | Date: 2025-06-04 | Hours: 4 | Rate: 120 | Description: Logo concepts and color palette
Expected output
Total billable hours: 9.5 Website Redesign: 5.5 hours, $825.00 Brand Guidelines: 4.0 hours, $480.00 Subtotal: $1,305.00 Tax (10%): $130.50 Grand total: $1,435.50
For the website redesign, 3.5 + 2 = 5.5 hours, and 5.5 × 150 = $825. For brand guidelines, 4 × 120 = $480. The subtotal is 825 + 480 = $1,305, tax is 10% of that, and the grand total is 1,305 + 130.50 = $1,435.50.
Each row captures a date, project name, client, hours worked, hourly rate, and a description. The calculator multiplies hours by rate per line to get that line's amount, then groups lines by project name to produce a per-project subtotal. Blank project names are treated as a single unspecified project.
A tax rate field (e.g. 10%) applies to the overall subtotal of all line items. The summary shows total hours, per-project subtotal, subtotal of all line items, tax amount, and grand total. The result is formatted as currency with two decimals; the tax rate defaults to a site-wide setting but can be edited.
No directly. The tool expects decimal hours, so 1 hour 30 minutes is 1.5. If you have times like 08:15 to 12:45, you need to compute the duration in hours yourself (e.g., 4.5) before entering. The per-line and total values are always calculated in decimal.
It is simply a percentage you configure; the tool does not distinguish. Most users treat it as a sales tax or service tax added to the invoice, but it could equally be a withholding or surcharge. The grand total is always subtotal plus that percentage.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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