Billable hours calculator

A billable hours calculator is a software tool that records the time spent on each project or task, computes the amount owed, and generates client invoices automatically. It replaces spreadsheets and paper timesheets with an accurate, real-time system that protects revenue and keeps billing honest.

Contractors and services businesses use it because time is money, and manual tracking leaks both. Reliable time tracking software logs work hours, improves billing accuracy, and helps maintain an efficient workflow across every client engagement.

Understanding billable hours

Billable hours aren't only for lawyers and attorneys at white-shoe firms. All labor is valuable, and employees deserve fair compensation for their work.

Billable hours are the time an employee or contractor spends on activities tied to a customer's project or product. In exchange, the client agrees to pay an hourly rate that compensates the worker. Any activity that drives value for the customer usually qualifies as billable.

How to calculate billable hours

There are four common ways to calculate billable hours.

1. Timesheets

Timesheet entry is the most basic method. Employees record start and end times for each task on a spreadsheet or on paper. At the end of a period, accounting uses the document to calculate billable hours, invoice the client, and distribute wages.

2. Project-based

Companies working across multiple initiatives set a project-based billing rate at the start of the engagement and lock it into the contract. Employees track time against each project and multiply hours by the agreed rate to determine what to invoice.

3. Activity-based

Another option: Categorize specific tasks as billable or non-billable, and only invoice clients for the billable ones.

4. Digital tracking

A digital time tracking or project management tool replaces manual entry. These tools log hours at the click of a button, populate a digital worksheet, calculate totals, and hand that data to accounting, so employees can focus on work that drives value.

Billable hours chart example

A billing increment chart lets you quickly convert partial hours into charges. The most accurate format breaks an hour into six-minute increments, or 1/10th of an hour.

For 20 minutes worked at an hourly rate of $125/hour, the math looks like this:

Billable increment ✕ Rate = Total

0.4 ✕ $125 = $50.00

Challenges when tracking billable hours

Time tracking has issues leaders must address. Here are the most common roadblocks:

1. Time entry errors

Manual timekeeping is prone to human error. Worklog mistakes lead to invoices that overcharge or undercharge the client.

2. Lack of visibility

Without real-time tracking, employers can't monitor employee activity or attribute hours to the correct client or project. That also drives inaccurate billing.

3. Ineffective time allocation

Scheduling across multiple tasks is hard without dedicated tracking software. The result is overtime, higher costs, and burnout.

4. Reporting issues

Analyzing team performance without a real-time system is labor-intensive and imprecise. You can only measure hours, performance, and profitability based on what employees remember to record.

Difference between billable and non-billable hours

To charge clients accurately, businesses must define what clients are paying for. Only then can they tell employees which activities count.

Billable hours

Billable hours cover a predetermined set of activities that drive value for the client or company. The employment agreement or third-party contract defines invoiceable tasks and their pay rates. Typical examples:

• Project planning

• Research

• Resource allocation

• Tasks tied to project outcomes

• Client-requested revisions

Non-billable hours

Some tasks don't count toward billable hours, either because they don't contribute to the outcome or because they're routine employer responsibilities. Common examples:

• Employee onboarding and training

• Generating client proposals

• Staff meetings and internal communications

• Unscheduled phone calls

• Administrative tasks

• Customer entertainment

Track non-billable hours anyway. A log of time spent on non-revenue activity uncovers efficiency gains that lift profitability.

The importance of a reliable tracking system

A tool that tracks your hours streamlines both time management and accounting.

1. Accurate invoicing records

A tracking tool improves invoicing by:

• Showing clients how much they pay for employee or freelancer work

• Ensuring employees get paid for working hours while creating accountability for inactive time

• Automating calculation and invoicing so the client or business can monitor real-time labor costs

• Demonstrating productivity by pairing outcomes with a log of working hours

2. Value of non-billable hours

With visibility into the workday, managers can see how team members spend their time. If a task drags or activity dips, they can act to reduce unproductive time.

3. Process optimization

With insight into billable and non-billable hours, management can:

• Focus on tasks that maximize ROI and profitability

• Build accurate quotes for future clients

• Adjust hourly rates and fees on data, not guesswork

• Prepare accurate quarterly and annual budgets

Best practices for managing billable hours

These guidelines help a firm invoice clients efficiently and honestly.

• Prioritize client experience: Clarify billing practices and policies at the start of the relationship. Set expectations for how billing and payment will work.

• Be accurate: Use a time tracker with break tracking so team members don't add unproductive hours to their records. Encourage employees to stop the timer when they aren't working and track in real time.

• Separate charges by task: Break down costs by task to give clients transparent, accountable billing. It beats charging for generalized blocks of time.

• Include details: Add task descriptions so clients understand the value of your services.

• Be honest: Padding hours destroys client trust. Instead of rounding up, use six-minute increments to keep invoices as precise as possible.

Enhance billable hours tracking with Tempo

Whether you're a lawyer working a big case or a graphic designer logging hours for a special project, the right software makes tracking and invoicing easier.

Tempo's Financial Manager for Timesheets pairs time tracking with team integrations that streamline reporting. It surfaces granular insight into billable hours across teams, projects, and resources. Better accuracy improves estimation, resource allocation, and profitability.

Don't operate in the dark. See how Tempo can strengthen your business intelligence, one app at a time.