Most contractors set their hourly rate by looking at what competitors charge and picking a number somewhere in the middle. That's backwards. Your rate has nothing to do with what the contractor down the street charges - it has everything to do with what it costs you to operate your business and what you want to take home. A rate built on competitive observation tells you whether you'll win work. A rate built from your actual costs tells you whether you'll stay solvent while doing it.
The calculation has four components: your desired salary, your annual business expenses, your billable hours per year, and your profit target. The last one - billable hours - is where most contractors underestimate significantly. Working 2,000 hours a year doesn't mean billing 2,000 hours. Admin, estimating, driving, callbacks, and unbillable warranty work shrink that number fast. The BidFlow Contractor Hourly Rate Calculator accounts for all of it. This guide explains the math so you understand what you're calculating and why.
The billable hours gap - where rate estimates quietly collapse
A full-time contractor working 50 weeks a year at 40 hours per week puts in 2,000 hours. Almost none of them bill all 2,000. Here's where hours go:
| Activity | Estimated Weekly Hours | Annual Hours Lost |
|---|---|---|
| Estimating and bidding | 4–6 hrs | 200–300 |
| Admin, invoicing, bookkeeping | 2–4 hrs | 100–200 |
| Travel between jobs | 2–5 hrs | 100–250 |
| Supplier runs, material pickup | 1–3 hrs | 50–150 |
| Warranty callbacks, punch-list | 1–2 hrs | 50–100 |
| Total lost to non-billable work | 10–20 hrs | 500–1,000 |
A solo contractor realistically bills 1,000–1,500 hours per year despite working 2,000. If you've been pricing as though you bill every hour you work, your effective hourly rate is dramatically lower than you think - and the revenue you need to generate is correspondingly higher. The BidFlow Contractor Hourly Rate Calculator asks for billable hours per week directly, so the rate it produces reflects your actual availability, not a theoretical maximum.
The cost buildup - what your rate must cover
Your hourly rate needs to generate enough revenue to cover three layers: your salary, your business expenses, and your profit target. The formula works backward from total revenue needed, then divides by billable hours to arrive at the rate.
Here's how the BidFlow calculator structures those expense categories:
| Cost Category | What It Covers | Typical Annual Range (solo contractor) |
|---|---|---|
| Owner salary | Your personal draw / wage | $60,000 – $120,000 |
| Insurance | Liability, workers' comp, health | $8,000 – $25,000 |
| Vehicle | Payment, fuel, maintenance, registration | $8,000 – $18,000 |
| Tools and equipment | Purchases, repairs, rentals | $3,000 – $12,000 |
| Marketing | Website, ads, lead services, cards | $2,000 – $8,000 |
| Office and software | Phone, accounting software, office supplies | $1,500 – $5,000 |
| Other expenses | Training, dues, misc | $1,000 – $4,000 |
These costs exist whether you're billing or not. A slow week doesn't reduce your insurance premium or truck payment. That's why the hourly rate calculation must be built on annual totals, not per-job estimates.
How to calculate your minimum hourly rate - step by step
This example uses a residential electrician working solo, targeting $85,000 in personal salary, with 46 billable weeks per year and 28 billable hours per week (accounting for the admin and travel overhead).
1Sum all annual business expenses
FormulaTotal Expenses = Insurance + Vehicle + Tools +
Marketing + Office + Other
Insurance: $14,000 | Vehicle: $12,500 | Tools: $6,000 | Marketing: $4,000 | Office/software: $2,400 | Other: $1,800. Total expenses: $40,700 per year.
2Calculate total revenue needed
FormulaRevenue Needed = (Salary + Total Expenses) ÷ (1 −
Profit Target %)
Salary ($85,000) + Expenses ($40,700) = $125,700 in costs. With a 15% profit target, the divisor is 1 − 0.15 = 0.85. Revenue needed: $125,700 ÷ 0.85 = $147,882. The profit percentage is applied this way - rather than added on top - so the final margin is calculated on revenue, not cost.
3Calculate total billable hours
FormulaTotal Billable Hours = Work Weeks × Billable Hours
Per Week
46 weeks × 28 billable hours = 1,288 billable hours per year. This is the denominator - the actual productive capacity available to generate revenue.
4Calculate hourly rate
FormulaHourly Rate = Revenue Needed ÷ Total Billable
Hours
$147,882 ÷ 1,288 = $114.81/hr minimum rate. This is the floor - the rate below which the business loses money relative to its targets. The BidFlow Contractor Hourly Rate Calculator also outputs daily rate ($918/day) and weekly rate ($3,215/wk) automatically.
5Sanity-check against the market
FormulaMarket check: Is your minimum rate competitive in
your area and trade?
If the math says $115/hr and the local market for licensed electricians is $95–$130/hr, you're in range. If the math says $160/hr and the market tops at $110/hr, something in the cost structure needs adjusting - either reduce expenses, increase billable hours, or lower the salary target. The rate the market will pay sets the ceiling; your cost structure sets the floor. You need those two numbers to meet.
Rate benchmarks by trade and experience level
These are directional figures for the US market. Regional variation is significant - rates in high cost-of-living metros can run 30–50% above national averages.
| Trade | Entry / Low | Experienced | Senior / Specialty |
|---|---|---|---|
| General contractor | $75/hr | $100–$130/hr | $150+/hr |
| Electrician | $80/hr | $100–$140/hr | $160+/hr |
| Plumber | $85/hr | $110–$150/hr | $175+/hr |
| HVAC technician | $75/hr | $95–$135/hr | $155+/hr |
| Carpenter / finish work | $55/hr | $75–$110/hr | $130+/hr |
| Painter | $45/hr | $60–$85/hr | $100+/hr |
Run the BidFlow Contractor Hourly Rate Calculator at the start of each year when you know your actual expenses and workload - not just once when you start the business. Costs change. Billable capacity changes. A rate that worked three years ago may be leaving money on the table or quietly running the business underwater today.
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