Free tool

Subcontract margin calculator

Enter what the client pays for each part of the job and what each subcontractor charges for it. The calculator shows your profit, margin and markup on every trade and on the whole job.

Free, with no sign-up. Everything is worked out in your browser: nothing you type is sent to us or stored. Use figures excluding VAT.

Margin on a job, trade by trade

One line for each part of the job you send out: what the client pays for it, and what the subcontractor charges you for it.

TradeClient pays (£)Subcontractor charges (£)ProfitMarginMarkupRemove
Whole job

The most you can pay a subcontractor

Enter what the client pays for that part of the job and the margin you want to keep.

Most you can pay
Your profit
Same as a markup of

Margin to markup, and back

Type in either box and the other one changes.

Margin and markup are not the same number

Margin is your profit as a share of what the client pays. Markup is your profit as a share of what the subcontractor charges. On the same job the markup is always the bigger figure, so a firm that adds 20% to a subcontractor's price keeps a margin of only 16.7%.

A worked example

A fit-out job with three trades sent out. The client pays for each part, each subcontractor charges for theirs, and the difference is yours to cover your own costs and profit.

TradeClient paysSubcontractorProfitMarginMarkup
Electrical£12,000£9,000£3,00025%33.3%
Ceilings£8,000£6,400£1,60020%25%
Flooring£5,000£4,100£90018%22%
Whole job£25,000£19,500£5,50022%28.2%

The markup to add for the margin you want

To keep a set margin, divide the subcontractor's price by one minus the margin. These are worked out by the calculator above.

Margin you keepMarkup to addOn a £10,000 subcontract, charge the client
10%11.1%£11,111.12
15%17.6%£11,764.71
20%25%£12,500
25%33.3%£13,333.34
30%42.9%£14,285.72
35%53.8%£15,384.62
40%66.7%£16,666.67

Questions

What is the difference between margin and markup?

Margin is profit divided by the price the client pays. Markup is profit divided by what the work costs you. A 25% markup gives a 20% margin.

How do I work out the margin on subcontracted work?

Take what the client pays for that part of the job, subtract what the subcontractor charges, and divide the answer by what the client pays. Do it trade by trade, because one trade priced too tight can hide inside a job that looks fine in total.

Does the calculator include VAT?

No. Use figures excluding VAT on both sides, so the margin is on the money the business keeps.

Where SUBR comes in

SUBR is AI software for UK contractors who send work out to subcontractors. Its AI reads your client quote, your office names each trade's share, and SUBR builds every scope with your costs, margin and client price left off it. Each subcontractor answers on their own link and sees only their own price.

Book a demo

See it on a quote

A short call. We walk a dummy quote from PDF to jobs on site.