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How to Calculate ROI for Your ERP Investment

Complete guide with ROI formula, real calculations, and 3 Sri Lankan business case studies


Introduction: The CFO's Dilemma

You're the CFO (or business owner playing CFO). Your operations team is begging for ERP. You're convinced there's a problem. But you need to justify LKR 3-5 million Year 1 investment to the board.

They'll Ask:

  • "What's the ROI?"
  • "When do we break even?"
  • "Can you prove this pays for itself?"

The Honest Answer:

Typical ERP ROI for Sri Lankan SMEs is 12-18 months breakeven, with 150-200% ROI over 3 years. But this varies—let's calculate YOUR specific ROI.

Understanding ROI: The Basic Formula

📊 The Simple ROI Formula

ROI = (Gain - Cost) / Cost × 100%

Cost of Investment

LKR 4,000,000

Gain from Investment

LKR 6,000,000

ROI Result

50%

⏱️ Payback Period (More Important!)

Payback = Total Investment / Annual Savings

Example: LKR 4M investment / LKR 3M annual savings = 1.33 years (16 months)

Direct Cost Savings: The Easy-to-Measure Benefits

1. Labor Cost Reduction

Task Before ERP After ERP Hours Saved Monthly Savings
Data entry 80 hrs/month 20 hrs/month 60 hrs LKR 90,000
Reconciliation 40 hrs/month 5 hrs/month 35 hrs LKR 52,500
Reports 24 hrs/month 4 hrs/month 20 hrs LKR 30,000
TOTAL 144 hrs 29 hrs 115 hrs LKR 172,500/mo

Annual Labor Savings: LKR 2,070,000

2. Error Reduction Savings (BIGGEST Category!)

Error Type Frequency Cost/Error Annual Cost Reduction Savings
Wrong shipments 8/month LKR 25,000 LKR 2.4M 90% LKR 2.16M
Duplicate payments 3/year LKR 150,000 LKR 450K 100% LKR 450K
Stockouts 12/month LKR 30,000 LKR 4.32M 85% LKR 3.67M
Pricing errors 15/month LKR 8,000 LKR 1.44M 95% LKR 1.37M
TOTAL Annual Error Cost: LKR 8.61M LKR 7.65M/year

Annual Error Reduction Savings: LKR 7,650,000 (BIGGEST impact!)

📊 Direct Savings Summary

Labor Reduction

LKR 2.07M

Error Reduction

LKR 7.65M

Inventory

LKR 4.23M

Collections

LKR 1.00M

Total Direct Savings: LKR 14,941,575/year

Case Studies: 3 Real Sri Lankan Businesses

Case Study #1: Apparel Manufacturer, Katunayake

Industry: Manufacturing | Size: 45 employees | Revenue: LKR 150M/year

Investment

LKR 5.2M (Year 1)

Annual Benefit

LKR 14.5M/year

Results after 18 months:

  • Eliminated 2 admin positions: LKR 1.44M/year saved
  • Material shortages down 88%: LKR 3.6M/year saved
  • Won 2 new large buyers: 22% revenue increase

Payback Period

14 mo

18-Month ROI

199%

"Biggest regret? Not doing this 2 years earlier. We wasted LKR 15M+ on inefficiency." - CEO

Case Study #2: Pharmaceutical Distributor, Negombo

Industry: Distribution | Size: 18 employees | Revenue: LKR 80M/year

Investment

LKR 3.8M (Year 1)

Annual Benefit

LKR 2.5M/year

Results after 12 months:

  • Fraud prevention (3-way match): LKR 450K/year saved
  • Expiry waste reduced 85%: LKR 323K/year saved
  • Stockouts down 92%: LKR 960K/year recovered

Payback Period

18 mo

"Conservative ROI looks marginal, but we couldn't have opened 4th warehouse without ERP. Real ROI: 8 months." - Owner

Case Study #3: Construction Company, Galle

Industry: Construction | Size: 30 employees | Revenue: LKR 200M/year

Investment

LKR 4.2M (Year 1)

Annual Benefit

LKR 15.5M/year

Results after 9 months:

  • Billable hours captured up 18%: LKR 7.2M/year additional
  • Project profitability: 18% → 27% average margin
  • Win rate improved: 28% → 35%

Payback Period

3.5 mo

9-Month ROI

177%

"ERP paid for itself in 3.5 months. Game-changer for project-based business." - CEO

🧮

Calculate Your ERP ROI Now

Use our free interactive calculator to see YOUR specific ERP ROI, payback period, and 3-year savings projection.

🧮 Launch ROI Calculator

Includes: Real-time calculations, 3-year projections, printable reports, sensitivity analysis

Common ROI Calculation Mistakes to Avoid

❌ Mistake #1: Vendor-Provided ROI

Vendor says "500% ROI in 6 months!" Don't trust it. They cherry-pick best customers. Calculate YOUR ROI with YOUR numbers.

❌ Mistake #2: Ignoring Soft Costs

Missed: Internal project team time, productivity dip during go-live, change management. Add 20% contingency.

❌ Mistake #3: Overstating Benefits

"We'll eliminate 3 positions!" Reality: 1.5 positions reassigned. "Errors drop 100%!" Reality: 90%. Be conservative.

❌ Mistake #4: Not Tracking Actual Results

Calculate projected ROI, then never measure actual. Track metrics 6, 12, 18 months post-go-live.

Conclusion: ROI is Measurable, Not Magical

ERP ROI is real and calculable. Not "we'll be more efficient" (vague), but measurable savings.

Investment

LKR 3-5M

Annual Savings

LKR 3-8M

Payback Period

8-18 months

3-Year ROI

150-300%

Need help calculating your specific ROI? Try our free ROI calculator or contact us for personalized consultation.

Need help calculating your specific ROI? Contact us for a free consultation.


About ChaosHub: We help Sri Lankan businesses calculate real ROI—not vendor promises, but YOUR numbers.

How to Calculate ROI for Your ERP Investment
ChaosHub January 10, 2026
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