Subcontractors, software licenses, materials — added to cost base directly, no rate applied.
Add phases and costs to see your project estimate
What is a project cost calculator?
A project cost calculator translates a work breakdown structure into a client-ready quote. Rather than multiplying a single rate by a rough hour estimate, it adds up labor costs phase by phase, separates pass-through expenses such as subcontractor fees and software licenses, applies a contingency buffer for risk, and then converts the total cost into a final price using a margin formula. The result is a quote that covers every dollar you spend and still returns a defined profit.
The core formula used here is the reverse margin method — not markup. The difference matters:
For example: three phases total $3,200 in labor, $49 in pass-through software costs, and a 10% contingency on labor adds $320. The cost base is $3,569. At a 20% profit margin, the client quote is $3,569 / 0.80 = $4,461.25, with $892.25 in net profit — exactly 20% of the final price. A 20% markup on the same cost base would return only $713.80 and leave you with a 16.7% margin, not 20%.
How to use this calculator
Add your project phases. Enter each phase of the work — for example, Discovery, Design, Development, and QA — with an estimated number of hours and an hourly rate. Each row calculates automatically. Use as many phases as the project requires; the tool sums them into a total labor cost.
Add pass-through costs. List any costs you purchase specifically for this project: a third-party API subscription, a stock asset license, a domain, subcontractor invoices, or ad spend. Pass-through costs are tracked separately from labor so your quote line items remain clear and auditable.
Set your contingency buffer. This percentage is added to your total labor cost as a risk reserve. A 10% buffer covers routine scope creep on well-defined projects; raise it to 20-25% for new clients, vague requirements, or projects with external dependencies. The buffer is part of your cost base, not your profit — it pays for real work, not speculation.
Set your profit margin. Enter the percentage of the final client quote you want to keep as profit. The calculator uses the reverse margin formula so the stated percentage is always accurate: a 20% margin means exactly 20% of every dollar billed is profit, regardless of project size.
Copy your quote. The results panel shows a full breakdown — labor by phase, pass-through costs, contingency, and profit — ready to paste into a proposal or invoice. Share the URL to pass the exact configuration to a colleague or client.
To build a sustainable hourly rate before filling in your phases, use the Freelance Hourly Rate Calculator to factor in overhead, non-billable hours, and income goals.