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Calculating Custom Software ROI

A practical framework for justifying your software investment.

The ROI Formula

ROI = (Total Benefits - Total Costs) / Total Costs × 100

Simple enough, but the challenge is accurately calculating benefits and costs. Here's how.

Calculating Total Costs

Initial Development Costs

  • Development fees
  • Design and UX work
  • Project management
  • Infrastructure setup
  • Data migration
  • Training and rollout

Ongoing Costs (Annual)

  • Hosting and infrastructure
  • Maintenance and updates
  • Support services
  • Future enhancements

Hidden Costs to Include

  • Internal staff time for requirements and testing
  • Productivity dip during transition
  • Integration with other systems

Calculating Benefits

Hard Savings (Easy to Measure)

  • Labor reduction: Hours saved × hourly cost
  • Error reduction: Cost of errors × reduction rate
  • SaaS elimination: Subscription fees avoided
  • Paper/printing: Material and handling costs

Soft Benefits (Harder to Measure)

  • Faster decisions: Value of time saved in reporting
  • Better customer experience: Retention improvement
  • Competitive advantage: New capabilities enabled
  • Scalability: Ability to grow without adding staff

Revenue Benefits

  • New revenue streams enabled
  • Faster quote-to-cash cycles
  • Improved close rates
  • Customer retention improvements

Example Calculation

Scenario: Order Management System

Costs (3-Year View)

  • Development: $150,000
  • Annual maintenance: $15,000 × 3 = $45,000
  • Hosting: $6,000 × 3 = $18,000
  • Total 3-Year Cost: $213,000

Annual Benefits

  • Labor savings (2 FTE hours/day): $52,000
  • Error reduction: $24,000
  • SaaS replacement: $36,000
  • Annual Benefits: $112,000
  • 3-Year Benefits: $336,000

ROI Calculation

  • ROI = ($336,000 - $213,000) / $213,000 × 100
  • 3-Year ROI: 58%
  • Payback Period: ~23 months

Tips for Accurate ROI

  1. Be conservative: Underestimate benefits, overestimate costs
  2. Use real data: Measure current processes before estimating savings
  3. Get input: Talk to the people who will use the system
  4. Consider timing: Benefits often ramp up over time
  5. Track actuals: Measure real results after implementation

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