Everhour keeps billable time tied to budgets and invoices while your calculation stays focused on approved hours and rates.
Track billable vs. non-billable time and see your real utilization rate and revenue potential in seconds.
Working hours in the period
Admin, meetings, internal work
Industry average is 75–80%
The calculator gives you the number — Everhour takes it from there.
One click and you're timing. Start a timer, add an entry, edit the details. This is exactly how it feels in Everhour.
Set a budget, assign rates, and get alerted before you're over.
Measurement
Track your budget through time or costs
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Tracked hours flow straight into a polished invoice — no copy-paste, no manual math.
A billable-hours calculation answers how much approved work is ready to invoice before any client-specific write-downs, retainers, discounts, or tax inputs. In Firefox, the math is the same as in any modern browser: billable hours multiplied by the agreed rate, separated from non-billable time that still matters for profitability and staffing review.
For U.S. work, use USD amounts and treat taxes as jurisdiction-specific inputs. The United States has no federal VAT/GST or national sales-tax rate for billed professional time. State and local treatment controls whether a service is taxable, so a calculator should not add a blanket national tax line.
The first decision is classification. Billable time is approved time that belongs on the client invoice under the engagement terms. Non-billable time includes internal meetings, admin work, corrections, business development, or tasks the contract excludes. Mixing the two inflates the invoice and hides the real cost of delivery.
Keep the source data open in another Firefox tab when checking totals: timesheet export, engagement letter, rate card, and invoice draft. Firefox autofill can help with repeated client fields, but do not let saved form values replace the current rate, tax jurisdiction, or write-down decision for the matter or project.
The base formula is billable amount = approved billable hours × agreed hourly rate. If the project has multiple roles or task rates, calculate each line separately, then add the subtotals. Write-downs reduce billable hours or invoice amount after the first calculation; they should be visible, not buried inside the original time entries.
For example, a web accessibility review includes 18 approved audit hours at $150 per hour and 16 approved remediation-check hours at $85 per hour. The audit line is $2,700, the remediation-check line is $1,360, and the pre-tax billable total is $4,060. If the service is taxable in the customer's state or locality, add that jurisdiction-specific tax after the labor subtotal.
A calculator is enough for a one-off estimate, a quick invoice check, or a freelancer validating whether approved entries match a rate sheet. It also fits a draft-invoice review when one person controls the time log, the rate, and the client approval path.
A managed workflow is needed when several people log time, budgets reset by period, or invoice value must be compared against a client cap. Everhour Project Budgeting tracks hour-based and money-based budgets, recurring budget periods, threshold email alerts, budget protection, expense inclusion controls, and client-level budgets, so billable totals stay connected to project limits before invoicing.
This content is for general information only, may not be fully up to date, and is provided without any warranty or liability.
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Billable hours are approved work hours that the client agreement allows you to charge. They exclude internal admin time, rework you decide not to bill, sales activity, and any task marked non-billable by policy or contract. The clean calculation starts after classification, because the rate formula only works on hours that are actually invoiceable.
Calculate each rate line separately, then add the subtotals. For example, multiply senior consultant hours by the senior rate and analyst hours by the analyst rate. Do not average the rates first unless the contract explicitly uses one blended rate. Line-by-line math preserves the audit trail and makes write-downs easier to explain.
No federal VAT/GST applies in the United States. Tax treatment is state and local, and some services are taxable while others are not. If a service is taxable in the relevant jurisdiction, add the correct state and local tax input after the labor subtotal. Do not treat the absence of federal VAT/GST as a universal tax exemption.
The most common mistake is using total worked time instead of approved billable time. A person can work 46 hours on a project while only 38 hours are client-billable under the agreement. Another frequent error is applying a current rate to older work when the engagement uses dated rate changes or project-specific exceptions.
Firefox does not change the formula, rate treatment, tax rule, or invoice total. Its practical role is workflow: keep the calculator, timesheet export, and contract terms in separate tabs or windows while checking the numbers. If Firefox restores a previous session, still verify that the displayed rate and date range match the current invoice.
Everhour Project Budgeting tracks time and money budgets as people log billable work, with recurring periods and threshold email alerts at defined budget levels. Teams can use budget protection to stop timers or prevent extra logging after a budget is exceeded, keeping invoiceable work aligned with approved client limits.
Everhour Billing & Invoicing turns tracked billable time and expenses into client invoices using project or member rates while excluding non-billable work. After time is included in an invoice, Everhour marks it as invoiced so the same hours do not appear again in a future invoice draft.
Use Everhour Project Budgeting to connect approved hours with client limits, recurring periods, alerts, and budget protection before invoice review, giving teams cleaner control over billable work.
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