Labour, markup, margin and VAT calculator
Turn a stated quantity and productivity into elapsed time and worker-hours, then show direct cost, markup, resulting gross margin, VAT and total separately.
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When to use it
Use for a transparent first-pass internal estimate after defining the work quantity, expected productivity per worker, crew size and genuinely loaded hourly rate.
How it works
Worker-hours = quantity ÷ productivity. Elapsed hours = worker-hours ÷ workers. Labour cost = worker-hours × hourly rate. Direct cost = materials + labour. Net selling price = direct cost × (1 + markup ÷ 100); gross margin is derived from selling price, then VAT is added separately.
Worked example
Assume 10 units of work, productivity of 1 unit per worker-hour, 2 workers, £30 per worker-hour, £0 materials, 20% markup and 20% VAT. Worker-hours = 10 ÷ 1 = 10; elapsed time = 10 ÷ 2 = 5 hours; labour and direct cost = 10 × £30 = £300. Net price = £300 × 1.20 = £360; gross margin = £60 ÷ £360 = 16.67%; VAT = £72; total = £432.
Measurement guidance
Work quantity, productivity per worker-hour, number of workers, hourly cost per worker, materials, markup and VAT. All rates and productivity values are supplied by the user.
Buying and specification checks
The calculator does not create a complete scope or automatically include plant, subcontractors, travel, supervision, overheads, contingency, non-productive time, variations or profit beyond the entered markup. VAT registration, rate and treatment must be verified for the actual supply.
Define the scope and cost basis before using the percentages
The output is only as complete as the quantity, productivity, rate and direct costs entered. Keep scope, risk and tax decisions visible outside the calculator.
- Break the job into measurable work packages and state what is included, excluded and assumed. Base productivity on relevant records or a reasoned estimate, including access, setup, clean-down and other non-productive time where it genuinely affects the rate.
- Use an hourly cost that represents one worker for one hour on the basis you intend. Record what it includes, and add all known materials. Price plant, subcontractors, delivery, overheads, risk allowances and other costs separately because this calculator has no dedicated fields for them.
- Apply markup to the defined direct-cost base, then read the resulting margin rather than treating the two percentages as interchangeable. Keep contingency or risk allowances separate and avoid adding the same amount twice.
- Treat the result as an internal planning estimate, not a customer-ready quotation. A quotation also needs an agreed scope, exclusions, validity, programme, payment and variation terms. After the job, compare estimated and actual worker-hours and costs to improve the next rate.
Common mistakes
- Confusing markup with margin
- Omitting non-productive time
- Applying unverified VAT treatment
Practical FAQs
Are markup and margin the same percentage?
No. Markup is profit divided by cost; gross margin is profit divided by net selling price. A 20% markup on £300 gives a £360 net price and a 16.67% gross margin.
Why do more workers reduce elapsed time but not worker-hours?
Productivity is entered per worker-hour. Ten worker-hours can be modelled as one worker for ten hours or two workers for five hours; labour cost still uses ten worker-hours, assuming the entered productivity remains valid for that crew.
Which VAT rate should I enter?
Use the rate and treatment that apply to the actual supply. VAT-registered businesses must charge VAT where required at the correct rate; rates and eligibility can change, so verify the current HMRC position rather than relying on the default.
Is the result ready to send as a quotation?
No. It is a first-pass calculation from user-supplied inputs. Check the complete scope, overheads, risk, plant, subcontractors, programme, exclusions, validity and terms before preparing any customer document.
Planning guidance, not a quotation or a substitute for project-specific design and competent advice.