Software Project Cost Calculator
Software project budget estimate.
Calculate software project cost from developer count, hourly rate, hours per developer, contingency, and infrastructure.
What this tool does
This calculator estimates the total budgeted cost of a software project by combining labour, contingency allocation, and infrastructure expenses. It multiplies the number of developers by their average hourly rate and planned hours to derive labour cost, then applies a contingency percentage as a buffer for unexpected expenses, and adds infrastructure costs to reach a total project budget figure. The result represents an aggregate cost estimate based on your inputs. Labour cost typically drives the largest portion of the final figure, though contingency and infrastructure amounts influence it significantly. A common scenario involves planning a custom application where a team works for a fixed duration at known rates. Note that this calculator does not account for indirect costs, regional rate variations, equipment purchases, or ongoing maintenance beyond the stated infrastructure figure. The output is an illustration for budgeting purposes and does not predict actual spending.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Software project cost = developer time + contingency + infrastructure. Most estimates underprice the contingency. A well-planned project still overruns 20-40% on time and budget because of scope creep, integration surprises, and dependencies that reveal themselves during development. The 20% contingency here is a floor; anything estimated without one will overrun by more.
3 developers at 80/hour for 320 hours each = 76,800 labour. Plus 20% contingency (15,360) and 3,000 infrastructure (servers, tools, licences) = 95,160 total. That's a reasonable estimate for a 2-month feature build with a small team. For larger projects, increase contingency to 30-40% - complexity scales non-linearly.
For agency bids, add another 25-40% margin on top of this to cover overhead and profit. A 95k internal project typically quotes at 120k-140k from an agency. Freelancers without overhead can charge closer to cost plus 10-20% margin and still be viable.
Run it with sensible defaults
Using number of developers of 3, avg hourly rate of 80, hours per developer of 320, contingency of 20%, the calculation works out to 95,160.00. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Number of Developers, Avg Hourly Rate, Hours per Developer, Contingency %, and Infrastructure Cost — do not pull with equal force.
How the math works
Labour = devs × rate × hours. Contingency = labour × %. Total = labour + contingency + infrastructure.
What to do with a low result
A disappointing result is information, not a judgement. Pick the single input that dragged the figure down most and focus the next quarter on that one factor. Breadth-first improvement rarely works; depth-first on the worst input usually does.
What this doesn't capture
The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.
3 devs × ££80 × 320h + 20% contingency + ££3,000 = 95,160.00.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes total project cost by multiplying the number of developers by their average hourly rate and hours allocated per developer to derive labour cost. A contingency buffer is then applied as a percentage of labour cost to account for uncertainties. The final project cost combines labour, contingency, and infrastructure expenses. The model assumes a constant hourly rate across all developers and treats contingency as a simple percentage uplift rather than a probabilistic reserve. It does not account for factors such as project management overhead, tooling licenses, tax implications, payment schedules, or variations in developer rates based on experience level or location.
References
Frequently Asked Questions
Why 20% contingency minimum?
How do I estimate hours per developer?
Does this include project management?
Why does agency quote 2x this?
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