# Project Cost Calculator Estimate project budgets, allocate resource rates, calculate milestones, and apply risk margins to plan accurate costs before you start. --- - **Canonical URL:** https://dothecalculation.com/calculators/project-cost-calculator - **Category:** Business tools - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## Build a project budget from resources and milestones Add labor resources with hourly rates, phase-by-phase milestone costs, and a risk contingency buffer to build a defensible total project budget. - Per-resource hourly rate x hours labor costs - Per-milestone resource and material costs - 0-30% risk contingency buffer ## How This Calculator Builds a Project Budget Accurate project costing is the difference between a profitable contract and an operational loss. This tool builds a budget from two lists you control directly, plus one risk buffer: a list of labor **resources** (each with a name, an hourly rate, and estimated hours), a list of **milestones** or project phases (each with a subcontractor/resource cost and a materials or misc cost), and a **contingency percentage** (0% to 30%) applied to the whole budget. Add or remove resources and milestones as needed — the calculator recalculates the full budget live as you edit rates, hours, or per-milestone costs. ## The Project Costing Formulas $$\text{Labor Cost} = \sum (\text{Resource Rate} \times \text{Resource Hours})$$ $$\text{Milestone Cost} = \sum (\text{Milestone Resource Cost} + \text{Milestone Material Cost})$$ $$\text{Base Project Cost} = \text{Labor Cost} + \text{Milestone Cost}$$ $$\text{Contingency Amount} = \text{Base Project Cost} \times \frac{\text{Contingency \%}}{100}$$ $$\text{Total Budget} = \text{Base Project Cost} + \text{Contingency Amount}$$ ## Factoring in Labor Burdens and Overhead When entering a resource's hourly rate, do not use the raw wage paid to that employee. Use the **fully burdened labor rate** instead, which includes payroll taxes, workers' compensation insurance, retirement matches, and benefits — the [labor burden rate calculator](/calculators/labor-burden-rate-calculator) will get you that number. For subcontractor or vendor costs on a specific phase, add them to that milestone's resource cost or material cost fields rather than creating a separate resource row, since milestone costs are tracked per-phase. ## Choosing a Contingency Percentage Projects rarely proceed exactly as planned. Material prices can rise, tasks can take longer, or clients can request additions. As a rule of thumb: 5-10% contingency for highly defined, repetitive work; 10-20% for standard business projects; and 20-30% for R&D, new technology, or highly volatile scopes. ## How to Use This Calculator Add each team member or contractor as a resource with their fully burdened hourly rate and estimated hours, add each project phase as a milestone with its own resource and material costs, and set your contingency percentage with the slider. The calculator sums all resource rate × hours products for labor cost, sums all milestone resource and material costs, adds the two together for the base project cost, then applies your contingency percentage on top for the final total budget. ## Worked Example: 2 Resources, 2 Milestones, 15% Contingency A small software project has two resources — a designer at $80/hr for 40 hours, and a developer at $100/hr for 120 hours — and two milestones: Design Review ($1,500 resource cost + $300 materials) and API Launch ($3,000 resource cost + $1,000 materials), with a 15% contingency buffer. Labor cost: (80 × 40) + (100 × 120) = $3,200 + $12,000 = $15,200. Milestone cost: ($1,500 + $300) + ($3,000 + $1,000) = $1,800 + $4,000 = $5,800. Base project cost: $15,200 + $5,800 = $21,000. Contingency amount: $21,000 × 15% = $3,150. Total budget: $21,000 + $3,150 = $24,150 — the figure to present in a client proposal. ## Related Calculators Get accurate fully burdened rates to plug into your resource list with the [labor burden rate calculator](/calculators/labor-burden-rate-calculator), and once you know your total cost, work out a client-facing bid price with the [profit margin calculator](/calculators/profit-margin-calculator). ## Frequently asked questions ### What counts as a "resource" in this calculator? A resource is any team member, contractor, or role billing hourly time to the project. Each resource has a name, an hourly rate, and estimated hours; the calculator multiplies rate by hours for each one and sums them into total labor cost. ### What counts as a "milestone" in this calculator? A milestone is a project phase or deliverable with its own resource cost (subcontractor or allocated labor) and material cost (supplies, licenses, hardware). Each milestone's two costs are added together, then all milestones are summed into total milestone cost. ### How is the total budget calculated? Total labor cost (resources) plus total milestone cost equals the base project cost. The contingency percentage is then applied to the base cost, and that contingency amount is added on top for the final total budget. ### What is the fully burdened labor rate? The burdened labor rate is the total hourly cost of a resource, including their base wage plus payroll taxes, benefits, insurance, and overhead — not just their gross hourly wage. ### How much contingency buffer should I add? A standard practice is 5-10% for well-defined, repetitive work, 10-20% for typical business projects, and 20-30% for R&D or highly uncertain scopes. This calculator caps the slider at 30%. ### Does this calculator compute a client bid price or markup? No. This calculator computes your total internal cost (labor plus milestones plus contingency). To add a profit markup on top and determine a client-facing bid price, use the total budget as the "cost" input in the [profit margin calculator](/calculators/profit-margin-calculator). ### Does this calculator support subcontractor fees? Yes. Add subcontractor fees to a milestone's resource cost field, or create a dedicated resource row with an estimated rate and hours if you're billing them hourly. ### What is scope creep? Scope creep is when a project's requirements expand beyond the original agreement without a corresponding increase in budget or timeline. The contingency buffer partially protects against it, but large scope changes should trigger a formal change order. ### What is G&A overhead, and where does it go in this calculator? General and Administrative overhead represents the ongoing costs of running the business (rent, legal, accounting) not tied to a specific project. Allocate a share of it into a milestone's material cost field, or build it into your resources' fully burdened hourly rates. ### Why do estimates differ from actual costs? Estimates are projections. Real costs can differ due to fluctuating material prices, labor inefficiencies, delays, or unexpected conditions — which is exactly what the contingency buffer is meant to absorb. ## Related concepts - **Burdened Labor Rate** — The total hourly cost of a resource including wages, benefits, and payroll taxes, used instead of gross wage in project bids. - **Contingency Buffer** — A percentage added to the base project cost to protect margins from unexpected overruns. - **Scope Creep** — Uncontrolled expansion of project deliverables without a corresponding adjustment to budget or schedule. ## Related guides - [Freelance Rate Setting: Calculate a Sustainable Rate](https://dothecalculation.com/blog/business/freelance-rate-setting) — Calculate a freelance hourly rate from income goals, expenses, tax reserve, billable capacity, and time off, then convert it into project or retainer pricing. - [Side Hustle Tax Guide: Net Profit, Self-Employment Tax, and Cash Reserves](https://dothecalculation.com/blog/finance/side-hustle-tax-guide) — Understand how side hustle taxes start with net profit, when self-employment tax applies, and how to plan reserves, estimated payments, and pricing more realistically. ## Related calculators - [Customer Support Cost-Per-Ticket Calculator](https://dothecalculation.com/calculators/customer-service-cost-calculator) — Calculate support team cost-per-ticket, monthly support costs, and project scaling budgets to plan staffing for customer service teams. - [Billable Utilization Rate Calculator](https://dothecalculation.com/calculators/billable-utilization-calculator) — Track individual or team billable utilization rates, revenues, profits, and breakeven rates to optimize staffing and pricing decisions. - [Employee Turnover Rate & Cost Calculator](https://dothecalculation.com/calculators/employee-turnover-calculator) — Compute employee turnover rate, retention rate, average headcount, and total replacement cost to budget for hiring and staff retention. - [Cost of Goods Sold (COGS) Calculator](https://dothecalculation.com/calculators/cogs-calculator) — Calculate cost of goods sold using beginning and ending inventory plus direct costs for accurate accounting and profitability reporting. - [Lead Conversion Rate & Sales Funnel ROI Calculator](https://dothecalculation.com/calculators/lead-conversion-roi-calculator) — Estimate lead conversion rates, attributed revenue, campaign ROI, and cost per lead to measure how well your sales funnel performs. - [Return on Ad Spend (ROAS) Calculator](https://dothecalculation.com/calculators/return-on-ad-spend-calculator) — Estimate ad campaign profitability, customer acquisition costs, return on investment, and break-even ROAS targets for smarter budgets. --- _This calculator is for educational and business planning purposes only. Project budgets, contingency buffers, and margin estimates are projections and do not constitute legal, tax, or professional advice. Always verify contractual rates and vendor pricing before finalizing commercial agreements._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/project-cost-calculator). Quote freely with attribution and a link to this page._