How to Calculate Gross Profit Per Job in a Service Business

A service business can be busy every day and still have no idea which jobs are actually making money.

You may know:

monthly revenue

and:

monthly profit

but still be unable to answer:

Was yesterday’s £1,200 plumbing job profitable?

Did that £8,000 electrical installation make enough margin?

Are maintenance jobs better than emergency repairs?

Which services should we market more aggressively?

That is why learning how to calculate gross profit per job is so useful.

Job-level profitability connects:

Quoted Price

↓

Actual Labor

↓

Actual Materials

↓

Other Direct Costs

↓

Gross Profit

↓

Gross Margin

When you know these numbers, pricing decisions become much stronger.

Instead of saying:

“That felt like a good job.”

you can say:

“That job produced £480 gross profit at a 40% margin.”

That is a much better way to run a service business.

What Is Gross Profit Per Job?

Gross profit per job is the amount remaining after subtracting the direct costs required to complete that specific job.

A simple formula is:

Job Revenue − Direct Job Costs = Gross Profit

For example:

Job revenue:

£1,000

Direct costs:

£600

Gross profit:

£400

That £400 then contributes toward:

• office staff;
• rent;
• software;
• marketing;
• insurance;
• management;
• business profit.

Gross profit is not necessarily the final profit the owner keeps.

It is the amount available after direct job costs.

What Is Gross Margin Per Job?

Gross margin expresses gross profit as a percentage of job revenue.

Formula:

Gross Profit ÷ Job Revenue × 100

Using the same example:

Gross profit:

£400

Revenue:

£1,000

Gross margin:

40%

This lets you compare jobs of different sizes.

A £500 repair and a £10,000 installation can both be evaluated using margin.

Why Gross Profit Per Job Matters

Total monthly revenue can hide weak jobs.

Suppose you complete:

Job A

Revenue:

£5,000

Gross profit:

£500

Gross margin:

10%

Job B

Revenue:

£2,000

Gross profit:

£800

Gross margin:

40%

Job A generated more revenue.

Job B generated more gross profit.

That means the bigger job was not necessarily the better job.

Revenue Is Not Profit

This sounds obvious, but many service businesses still manage by revenue alone.

Example:

You complete a:

£10,000 installation.

Materials:

£5,000

Labor:

£2,000

Subcontractor:

£1,000

Other direct costs:

£500

Total direct costs:

£8,500

Gross profit:

£1,500

Gross margin:

15%.

A £10,000 invoice may look impressive.

But the job produced relatively weak margin.

Step 1: Record Job Revenue

Start with the actual selling price.

Include:

• approved additional work;
• change orders;
• upgrades.

Do not only use the original quote if the final invoice changed.

Example

Original quote:

£2,500

Additional approved work:

£300

Final job revenue:

£2,800

Use:

£2,800

for the final job profitability calculation.

Step 2: Record Actual Labor Cost

Do not use only:

hours quoted.

Use:

hours actually worked.

Suppose:

Estimated labor:

6 hours.

Actual labor:

9 hours.

If true loaded technician cost is:

£30/hour

actual labor cost:

9 × £30 = £270

Using the quoted six hours would hide the real cost.

What Is Loaded Labor Cost?

Loaded labor cost is more than hourly wage.

It may include:

• wage;
• payroll costs;
• benefits;
• employer contributions;
• paid leave;
• other employment costs.

For example:

Technician wage:

£20/hour

True loaded cost:

£28/hour

For job costing, using the more realistic number gives you a better view of profitability.

Step 3: Record Materials

Use actual material cost.

Include:

• parts;
• fittings;
• cable;
• pipe;
• consumables;
• replacement units.

For example:

Boiler component:

£120

Fittings:

£25

Consumables:

£10

Total materials:

£155

Do not ignore small items just because they are inexpensive individually.

Across hundreds of jobs, they matter.

Step 4: Include Subcontractors

If another contractor contributes to the job, their cost is usually a direct job cost.

Examples:

• electrician;
• plasterer;
• roofer;
• scaffold company;
• skip hire;
• specialist engineer.

If subcontractor invoice is:

£750

that should be included in job costing.

Step 5: Include Job-Specific Expenses

Other direct costs may include:

• parking;
• permits;
• disposal;
• equipment hire;
• delivery;
• tolls;
• job-specific travel.

You do not need to overcomplicate small expenses.

But significant costs should be included.

Example Direct Cost Breakdown

Job revenue:

£3,000

Labor:

£600

Materials:

£1,000

Subcontractor:

£300

Equipment hire:

£100

Total direct cost:

£2,000

Gross profit:

£1,000

Gross margin:

33.3%.

Step 6: Calculate Gross Profit

Formula:

Revenue − Direct Costs = Gross Profit

Example:

Revenue:

£3,000

Direct costs:

£2,000

Gross profit:

£1,000

Simple.

But useful only if the direct costs are accurate.

Step 7: Calculate Gross Margin

Formula:

Gross Profit ÷ Revenue × 100

£1,000 ÷ £3,000:

33.3%

Now you can compare it against:

• company target;
• other jobs;
• other service types.

Example: Plumbing Repair

Revenue:

£480

Labor:

2 hours × £30:

£60

Materials:

£90

Parking:

£10

Total direct cost:

£160

Gross profit:

£320

Gross margin:

66.7%

This may be a very attractive service.

Example: Boiler Installation

Revenue:

£3,500

Labor:

£600

Boiler and materials:

£1,900

Disposal:

£100

Total direct cost:

£2,600

Gross profit:

£900

Gross margin:

25.7%

The installation generates more gross profit pounds than the repair.

But a much lower margin percentage.

Both metrics matter.

Gross Profit Pounds vs Gross Margin Percentage

Do not focus on only one.

Gross Profit Pounds

Tells you:

how much money the job contributed.

Gross Margin Percentage

Tells you:

how efficiently the job converted revenue into gross profit.

Example:

Job A

Revenue:

£10,000

Gross profit:

£2,000

Margin:

20%

Job B

Revenue:

£3,000

Gross profit:

£1,500

Margin:

50%

Job A produces more gross profit pounds.

Job B has stronger margin.

Which is better depends on:

• time;
• risk;
• capacity;
• cash flow.

Include Technician Time Correctly

A common mistake is:

We already pay the technician salary, so labor cost doesn’t matter.

It absolutely matters for job profitability.

Technician time is a scarce resource.

If a job takes:

10 hours

instead of:

5

that affects how much other work the technician could complete.

Track actual time.

Track Estimated vs Actual Labor

Example:

Estimated:

5 hours

Actual:

8 hours

Variance:

+3 hours

If loaded labor cost is:

£30/hour

extra cost:

£90

This may explain why the job missed margin target.

Track Estimated vs Actual Materials

Estimated:

£500

Actual:

£650

Variance:

+£150

Possible reasons:

• price increase;
• waste;
• incorrect estimate;
• extra materials not charged to customer.

This should inform future quoting.

Track Quoted Margin vs Actual Margin

Example:

Quoted margin:

40%

Actual margin:

27%

That is a significant difference.

Ask:

Why?

Possible reasons:

• labor ran over;
• materials increased;
• scope changed;
• discount applied;
• additional work not charged.

This is one of the most valuable job-costing reviews you can perform.

Change Orders Protect Gross Profit

A customer asks for extra work.

Technician says:

No problem.

Work takes:

2 extra hours

and uses:

£100 materials.

If the business does not charge for it:

gross profit drops.

Use change orders.

Example

Original job:

£2,000

Additional work:

£350

Additional direct cost:

£160

Additional gross profit:

£190

If the extra work is approved and billed, margin can be protected.

If not:

the company absorbs the cost.

Discounts Affect Gross Profit Directly

Suppose:

Normal price:

£1,000

Direct costs:

£600

Gross profit:

£400

Margin:

40%

Give customer:

10% discount

New price:

£900

Direct costs remain:

£600

Gross profit:

£300

Margin:

33.3%

A 10% discount reduced gross profit from:

£400 to £300

which is a:

25% reduction in gross profit.

Discounts can have a much bigger profitability impact than owners realize.

Calculate the Margin Impact Before Discounting

If technicians or sales staff can offer discounts:

give clear limits.

For example:

Up to 5% without approval

above that:

manager approval.

The exact policy depends on the business.

The goal is to protect margin.

Job Costing and Fixed Overhead

Gross profit does not usually include general overhead such as:

• office rent;
• admin salaries;
• software;
• general insurance.

Those are covered by gross profit across all jobs.

That is why the company needs enough total gross profit to cover overhead and create net profit.

This connects directly with break-even revenue.

Example

Monthly fixed overhead:

£25,000

Average gross profit per job:

£250

You need approximately:

100 jobs

just to generate:

£25,000 gross profit

before creating operating profit.

That is why gross profit per job is so important.

Gross Profit Per Technician Hour

A useful metric is:

Gross Profit ÷ Technician Hours

Example:

Gross profit:

£600

Technician hours:

4

Gross profit per technician hour:

£150

Compare another job:

Gross profit:

£800

Technician hours:

10

Gross profit per technician hour:

£80

The second job makes more total gross profit but uses much more field capacity.

This metric helps with:

• service mix;
• scheduling;
• marketing.

Example

Emergency Repair

Gross profit:

£500

Technician time:

2.5 hours

Gross profit per tech hour:

£200

Installation

Gross profit:

£2,000

Technician time:

30 hours

Gross profit per tech hour:

£66.67

Installation produces more total gross profit.

Repair produces much more profit per technician hour.

That can influence what you want to grow.

Track Gross Profit by Service Type

For example:

Service	Revenue	Gross Profit	Margin
Emergency Repairs	£25K	£14K	56%
Maintenance	£18K	£10K	55.6%
Installations	£60K	£15K	25%
Commercial Work	£40K	£11K	27.5%

Now you can see:

installations produce large revenue.

Repairs produce much stronger margins.

Marketing decisions can reflect that.

Track Gross Profit by Customer Type

Example:

Residential

Average margin:

45%

Commercial

Average margin:

28%

Commercial may still be attractive because:

• job size larger;
• repeat work;
• lower acquisition cost.

But the difference should be understood.

Track Gross Profit by Lead Source

This is where marketing and finance connect.

Google Ads Jobs

Revenue:

£40K

Gross profit:

£16K

Ad spend:

£7K

Contribution after ads:

£9K

Referral Jobs

Revenue:

£25K

Gross profit:

£12K

Referral cost:

£1K

Contribution after referral cost:

£11K

Referral business may generate less revenue but more useful profit.

Job Profitability Should Influence Marketing

Do not market every service equally.

Suppose:

Service A

Average job:

£2,000

Gross margin:

20%

Service B

Average job:

£800

Gross margin:

55%

If Service B also has strong demand:

it may deserve more marketing attention.

Gross Margin Targets Should Vary by Service

One universal margin target may not fit all job types.

For example:

Small Repair

Higher margin.

Large Installation

Lower percentage margin but larger profit pounds.

The important thing is knowing the acceptable range for each service.

Create Job Margin Bands

Example:

Green

40%+

Healthy.

Yellow

30–39%

Review.

Red

Below 30%

Investigate.

These are illustrative only.

Your actual thresholds depend on:

• trade;
• overhead;
• pricing model.

Review Low-Margin Jobs

Do not just look at averages.

Review individual jobs that performed poorly.

Ask:

• Was labor underestimated?
• Were materials higher?
• Was there rework?
• Was price discounted?
• Was scope unclear?
• Did we fail to charge for extras?

The goal is:

identify repeatable causes.

Example Job Review

Job #1056

Quoted:

£2,500

Target margin:

40%

Actual revenue:

£2,500

Actual direct cost:

£2,000

Actual gross profit:

£500

Margin:

20%

Reason:

• 6 extra labor hours;
• £250 unplanned materials.

Action:

• increase labor allowance;
• update estimating checklist.

That job just taught you how to price the next one better.

High-Margin Does Not Always Mean Best

Be careful.

A job with:

70% gross margin

may only create:

£70 gross profit.

Another job at:

30% margin

may create:

£3,000 gross profit.

You need to consider:

• gross profit pounds;
• technician time;
• risk;
• customer lifetime value.

Use multiple metrics.

Cash Flow Matters Too

A highly profitable commercial project may not pay for:

60 days.

A lower-margin residential repair may pay:

same day.

Both affect the business differently.

This is why job profitability should be considered alongside cash flow.

Job Profitability vs Customer Lifetime Value

A first job may have modest margin.

But the customer may later buy:

• maintenance;
• repairs;
• upgrades.

Do not judge every customer relationship from one invoice.

Still, individual job economics should remain visible.

Track Callbacks Against the Original Job

Suppose a job initially generated:

£400 gross profit.

Then requires a callback costing:

£120.

Adjusted gross contribution becomes:

£280.

Quality problems reduce profitability.

This is why callbacks should be linked to original jobs.

Track Warranty Costs Too

If a job repeatedly generates:

• free return visits;
• replacement materials;

the actual profitability may be much worse than the original job report suggests.

For larger businesses, warranty reserves or warranty cost tracking can improve accuracy.

Build a Job Profitability Dashboard

For each job, track:

Job Revenue

Labor Hours

Labor Cost

Materials

Other Direct Costs

Gross Profit

Gross Margin

Gross Profit per Technician Hour

Callback Cost

This creates powerful management data.

Example Job Dashboard

Job #1082

Service:

Boiler Repair

Revenue:

£750

Labor Cost:

£120

Materials:

£180

Other Direct Costs:

£20

Gross Profit:

£430

Gross Margin:

57.3%

Technician Hours:

4

Gross Profit / Tech Hour:

£107.50

Now you understand the job.

Build a Monthly Service Profitability Report

Example:

Repairs

Revenue:

£30K

Gross Profit:

£17K

Margin:

56.7%

Installations

Revenue:

£70K

Gross Profit:

£20K

Margin:

28.6%

Maintenance

Revenue:

£20K

Gross Profit:

£12K

Margin:

60%

This tells management:

• what is growing;
• what is profitable;
• what needs pricing review.

Track Margin Trends

Do not only track current month.

Example:

January

42%

February

40%

March

37%

April

34%

Gross margin is declining.

Possible causes:

• material costs rising;
• discounting;
• labor inefficiency.

Investigate before the decline becomes serious.

Use Historical Job Data to Improve Estimates

Your job-costing system should feed your estimating system.

If the last 20 jobs of a certain type average:

7.5 technician hours

stop quoting:

5 hours.

Actual data should improve future pricing.

Example

Quoted labor allowance:

4 hours

Historical average:

6.2 hours

Update standard estimate.

That can immediately improve margins.

Create a Price Book From Real Job Data

For common services, track:

• actual labor;
• actual material;
• target margin.

Then build standardized pricing.

This creates:

Job Data

↓

Better Price Book

↓

Better Estimates

↓

Better Margins

↓

More Reliable Profit

Do Not Wait Until Year-End

If you only discover poor profitability when your accountant prepares annual accounts:

it is too late to fix those jobs.

Review job profitability:

• weekly;
• monthly.

Especially for:

• installations;
• large projects;
• new service types.

Job Costing for Small Jobs

You do not need a 20-line cost report for every:

£80 service call.

For smaller jobs, use standardized costs where appropriate.

Example:

Standard labor cost:

£45

Average materials:

£10

This can make tracking practical without creating excessive admin.

Job Costing for Large Jobs

For larger projects, track more detail:

• labor by technician;
• subcontractors;
• materials;
• equipment;
• permits;
• change orders;
• warranty costs.

The larger the financial risk:

the more detail is justified.

Common Job Costing Mistakes

Using Quoted Labor Instead of Actual Labor

You need the true cost.

Forgetting Small Materials

Small costs add up.

Ignoring Subcontractors

Direct cost must include them.

Not Tracking Additional Work

Protect margin through approvals.

Giving Discounts Without Checking Margin

Discounts reduce profit quickly.

Ignoring Callbacks

Actual job profitability becomes overstated.

Tracking Revenue Only

Revenue is not profit.

Looking Only at Margin Percentage

Profit pounds matter too.

Not Comparing Estimated vs Actual

You miss the learning opportunity.

No Service-Level Reporting

You cannot see which services are strongest.

Job Profitability Checklist

For each major job, track:

• Final revenue
• Actual technician hours
• Loaded labor cost
• Materials
• Subcontractor cost
• Equipment / permits
• Change orders
• Discounts
• Callback cost
• Gross profit
• Gross margin
• Gross profit per technician hour
• Estimated vs actual margin
• Reason for major variance

Gross Profit per Technician Hour

Gross profit per job tells you which jobs make money. Gross profit per technician hour tells you how well you use your team’s time. To work it out, divide the gross profit from your jobs by the technician hours spent on them, including travel if you want the full picture.

Why This Metric Matters

A service business has limited technician capacity.

You may have:

• 3 technicians;
• 5 technicians;
• 20 technicians.

But each technician only has a limited number of working hours.

If too many of those hours are spent on jobs that produce weak margins, the business may remain busy without becoming more profitable.

Gross profit per technician hour helps you see:

how productive your field capacity is financially.

Multiple Technicians on One Job

Suppose two technicians work:

5 hours each.

Total technician hours:

10

Do not divide profit by:

5 hours.

Use:

10 technician hours.

Example:

Gross profit:

£1,200

Technician hours:

10

Gross profit per tech hour:

£120

This is critical for installations where several employees work together.

What Counts as Technician Hours?

You need a consistent definition.

Possible choices include:

On-Site Productive Hours

Time actively completing customer work.

Job Hours

Includes:

• travel;
• preparation;
• on-site work;
• documentation.

Paid Hours

All paid technician hours.

For job profitability, many businesses start with:

actual hours charged to the job.

For capacity planning, you may also use:

available hours.

Do not mix definitions from one month to another.

Productive Hours vs Available Hours

Suppose a technician works:

160 paid hours/month

but spends:

120 hours

on productive job work.

Gross profit generated:

£12,000

Gross Profit per Productive Hour

£12,000 ÷ 120:

£100

Gross Profit per Available Hour

£12,000 ÷ 160:

£75

Both are useful.

The first shows:

job productivity.

The second shows:

overall capacity efficiency.

Travel Time Affects Overall Profit per Hour

Imagine Technician A has:

£100 gross profit per productive hour

but spends:

35% of their day traveling.

Technician B produces:

£90 gross profit per productive hour

but travels only:

15%.

Overall available-hour profitability may favor Technician B.

Routing matters.

Technician Comparison Example

Alex

Gross profit:

£11,000

Productive hours:

110

GP/productive hour:

£100

Callback rate:

2%

James

Gross profit:

£12,000

Productive hours:

150

GP/productive hour:

£80

Callback rate:

1%

Alex creates more profit per hour.

James creates more total gross profit with slightly better quality.

Both can be strong performers.

Do Not Improve the Metric by Cutting Quality

A bad strategy:

• skip testing;
• rush jobs;
• reduce necessary materials.

This may improve short-term numbers and create:

• callbacks;
• complaints;
• warranty cost.

Quality must remain part of the scorecard.

Example Before and After

Before

Gross profit:

£48,000

Available technician hours:

800

GP/available hour:

£60

Improvements

• reduce callbacks;
• improve routing;
• raise pricing selectively;
• reduce material waste.

After

Gross profit:

£58,000

Same available hours:

800

GP/available hour:

£72.50

Increase:

£12.50/hour

Total additional gross profit:

£10,000/month

No additional technician required.

Use the Metric Before Hiring

Before adding another technician:

ask:

Are we using existing technician hours profitably?

If GP/available hour is low because utilization is weak:

hiring more capacity may make things worse.

If:

• utilization is strong;
• GP/hour is healthy;
• demand exceeds capacity;

then a new hire may make sense.

Sources and Further Reading

These official resources back up the methods in this guide and are worth reading alongside it.

• What kind of records should I keep (IRS): the income and expense records your job costing should be built on.
• Manage your finances (U.S. Small Business Administration): bookkeeping, financial statements and cash versus accrual accounting.
• Break-even point (U.S. Small Business Administration): the fixed costs ÷ contribution margin formula and a free break-even calculator.

Related guides

• How to Improve Gross Margin in a Service Business Without Just Raising Prices
• Revenue vs Profit vs Cash Flow: What Service Business Owners Need to Know
• How to Calculate Break-Even Revenue for a Service Business
• Tools, Software and Automation for Trades: Start Here

Frequently Asked Questions

How do I calculate gross profit per job?

Use:

Job Revenue − Direct Job Costs = Gross Profit

Direct costs may include:

• labor;
• materials;
• subcontractors;
• job-specific expenses.

How do I calculate gross margin per job?

Use:

Gross Profit ÷ Job Revenue × 100

Should technician labor be included?

Yes.

If technician labor is a direct cost of delivering the service, it should normally be included in job costing.

Should overhead be included in gross profit per job?

General business overhead is usually not included in gross profit.

Gross profit contributes toward covering overhead.

What is a good gross margin?

There is no universal target.

It varies by:

• service;
• trade;
• cost structure.

Use your own business economics and financial goals.

Should I track every job?

Ideally, major and repeatable jobs should be tracked.

For very small jobs, standardized costing may be more practical.

Why is gross profit per technician hour useful?

It shows how much gross profit a job generates relative to the field capacity it consumes.

Can a high-revenue job be unprofitable?

Yes.

If labor, materials, and other direct costs are too high, a large job may produce weak or negative profit.

Should callbacks be included?

For accurate operational profitability, callback costs should be linked back to the original job where practical.

How often should job profitability be reviewed?

Weekly or monthly review works well for many service businesses, with immediate review for unusually large or low-margin jobs.

Conclusion

Learning how to calculate gross profit per job gives service-business owners a much clearer picture of what is actually driving profitability.

Do not stop at:

Job Revenue: £5,000

Track:

Revenue

↓

Labor

↓

Materials

↓

Other Direct Costs

↓

Gross Profit

↓

Gross Margin

Then go one step further:

Gross Profit ÷ Technician Hours

This tells you not only:

which jobs make money

but also:

which jobs use your field capacity most effectively.

Use job-level data to improve:

• pricing;
• estimating;
• technician scheduling;
• service mix;
• marketing.

If a job misses margin target:

investigate.

Was it:

labor?

materials?

scope?

discounting?

callbacks?

Then use the answer to improve the next quote.

The real goal of job costing is not to create more spreadsheets.

It is to make sure the business learns from every job.

A healthy financial system should connect:

Estimate

↓

Job

↓

Actual Cost

↓

Gross Profit

↓

Better Future Pricing

That is how job-level data becomes better company-level profit.