Build vs Buy Calculator
Build vs. Buy Calculator
Determine whether to build in-house or buy an existing solution
Cost to Build: Employees × Daily Rate × (Weeks × 7)
Daily Rate: Annual Salary ÷ 365.25
Annual Maintenance: Employees × Daily Rate × Maintenance Days × 12
Saved Annually: Alternative Cost − Annual Maintenance
Years to Profit: Cost to Build ÷ Saved Annually
Build vs Buy Calculator is an essential calculator that helps companies to make clear, data-driven decisions with confidence whether to buy a software or build it from scratch. Because deciding whether to build your own software or buy an off-the-shelf solution is one of the toughest choices businesses face. A wrong decision can cost thousands, waste valuable time, and slow down the growth.
With just a few clicks, you will get to know which decision is best for your long-term projects.
What is a Build vs Buy Calculator?
A Build vs Buy Calculator is a tool that compares the cost, time, and benefits of building software in-house versus purchasing a ready-made solution. It considers things like:
- Development costs
- Software licenses
- Maintenance & upgrades
- Potential ROI
- Opportunity costs
By putting all these numbers together, the calculator tells you which option is more cost-effective and practical for your business.
What is the Formula for Build Calculator?
The total cost to build can be calculated using this formula:
Cost to Build=N×T×CE
Where:
- N = Number of developers on your team
- T = Time (in months) required to develop the software
- CE = Cost per employee
The cost per employee isn’t just their salary. It also includes additional expenses like benefits, insurance, and other overheads. You can calculate it as:
CE=SE×(1+OV)
Where:
- SE = Monthly gross salary of one employee
- OV = Overhead costs as a percentage of the gross salary (for example, 20% for insurance, taxes, and other benefits)
How to Use the Build vs Buy Calculator?
A Build vs Buy Calculator is designed to simplify one of the toughest business decisions. By following a few simple steps, you can quickly evaluate whether building software in-house or purchasing it is the better option.
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Step-by-Step Guide for Building in-house
Using the calculator starts with gathering the right information. Here’s how:
- List Development Costs: Include salaries for developers, design, testing, and project management.
- List Maintenance Costs: Consider ongoing costs such as updates, bug fixes, and server fees.
- Include Opportunity Costs: Factor in potential revenue lost or resources diverted while building software.
- List Purchase Costs (for buying software): Include license fees, subscription costs, integration, and training expenses.
- Enter Your Estimates into the Calculator: Each value goes into its respective field- development, maintenance, purchase, or subscription.
By inputting accurate numbers, the calculator can give you a realistic comparison of both options.
How the Calculator Evaluates Costs and Benefits
Once the data is entered, the calculator automatically computes:
Total Build Cost = Development Cost + Maintenance Cost + Opportunity Cost
Total Buy Cost = Purchase Price + Subscription Fees + Integration Costs
It then compares the two totals to show which option is more cost-effective. Some calculators also break down yearly costs, ROI, and payback periods so you can see not just which option is cheaper, but also which one adds more value over time.
An Example for Better Understanding
Your company wants to build a custom internal CRM system.
Step 1: Given Data:
- Number of developers (N) = 4
- Development time (T) = 6 months
- Monthly salary per developer (SE) = $6,000
- Overhead costs (OV) = 25% (0.25)
Step 2: Calculate Cost Per Employee (CE)
First, we calculate the real monthly cost of one developer:
CE = 6,000 × (1 + 0.25)
CE = 6,000 × 1.25
CE = 7,500
So, each developer actually costs the company $7,500 per month.
Step 3: Calculate Total Build Cost
Now we apply the main formula:
Cost to Build=N×T×CE
Cost to Build = 4 × 6 × 7,500
Cost to Build = 24 × 7,500
Cost to Build = $180,000
The total estimated cost to build the software is $180,000.
Now Compare with Buying:
Let’s say a ready-made CRM solution costs:
- License fee: $40,000
- Annual subscription: $30,000
- Integration & training: $10,000
Total Buy Cost (Year 1)
40,000 + 30,000 + 10,000 = $80,000
Final Comparison
- Build Cost: $180,000
- Buy Cost: $80,000
In this case, buying the software saves:
180,000 − 80,000 = $100,000
Learn more about Break-even Calculator
Advantages and Disadvantages of Build vs Buy Decision
| Category | Pros | Cons |
|---|---|---|
| Build Your Own Software | Fully customized to your needsTotal control over features and updatesCan provide a competitive advantage | High upfront development costTime-consumingRequires in-house expertise and ongoing maintenance |
| Buy Off-the-Shelf Software | Faster deploymentLower upfront costVendor handles updates and support | Less customizationPotential ongoing subscription costsMay include features you don’t need |
Industry-Specific Considerations
Small Businesses
Small businesses often benefit from buying software because it’s quicker, cheaper, and requires no specialized team.
Enterprises
Large organizations with unique workflows may benefit from building custom software, but only if the long-term ROI justifies the higher upfront cost.
SaaS vs Custom
Cloud-based SaaS solutions are convenient but may have recurring fees. Custom-built software gives control but can take months to develop.
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Conclusion
Choosing whether to build or buy software doesn’t have to be a gamble. With a Build vs Buy Calculator, you can see the costs clearly, compare options, and make smarter decisions. Stop wasting time on guesswork and start using data to guide your software choices today.
FAQs
1. What is a Build vs Buy Calculator?
A Build vs Buy Calculator is a decision-making tool that helps businesses compare the cost of developing custom software with the cost of purchasing ready-made software. It calculates development expenses, salaries, overhead, subscription fees, and other costs to show which option is more cost-effective.
2. Does a Build vs Buy Calculator consider long-term costs?
Yes. A good Build vs Buy Calculator can evaluate both short-term and long-term costs, including:
- Ongoing maintenance
- Subscription renewals
- Upgrades
- Scaling expenses
- Tis helps businesses understand the Total Cost of Ownership (TCO) over several years.
3. Can small businesses use a Build vs Buy Calculator?
Absolutely. Small businesses can benefit greatly from a Build vs Buy Calculator because it helps avoid overspending on custom development when affordable SaaS options are available. It provides clarity and reduces financial risk.
