Apply overhead and profit to a job's cost to get the price — the classic contractor O&P method (often quoted as "10 and 10").
This applies overhead to cost, then profit to the total — the common contractor convention. Some contracts apply both to cost directly; confirm which your bid uses. Estimate only.
Contractors often add 10% overhead and 10% profit to a job's cost — but applied in sequence, "10 and 10" is about 21% on top, not 20%. Overhead covers running the business; profit is what's left for you.
Price = cost × (1 + overhead %) × (1 + profit %)
No — applied in sequence it's 1.10 × 1.10 = 1.21, so about 21%. Small difference, real money on a big job.
Overhead pays for the costs of being in business (office, insurance, admin). Profit is your reward for the risk and capital — keep them separate so you can see both.
Related: job cost calculator · markup calculator · profit margin calculator · all free calculators.
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