How to Calculate ERP ROI Before You Buy: A Framework for SMEs

"Is ERP good?" is the wrong question. The right question is: "Is ERP right for our business right now, and does it deliver worthwhile returns?"

This article walks you through a serious ERP ROI analysis before committing your budget.

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What Is ROI in the ERP Context?

Return on Investment (ROI) = (Benefit - Cost) / Cost × 100%

For ERP:

• Cost = license fees + implementation + training + maintenance + hidden costs
• Benefit = efficiency savings + revenue increases + reduced risk

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Step 1: Calculate Total Cost of ERP

1.1 Software License Cost

1.2 Implementation Cost

Typically 1–3x the annual license cost. For custom ERP, it equals the total development cost.

1.3 Training Cost

• End-user training: 5,000–20,000 THB per person per module
• Admin training: 15,000–50,000 THB
• Internal documentation creation: significant staff hours

1.4 Hidden Costs People Forget

• Productivity dip — staff need 2–6 months to learn the new system; expect 20–30% efficiency drop during this period
• Data migration — cleaning, transforming, and loading legacy data
• Process re-engineering — some workflows must change for ERP to work
• Change management — consultants, communication, incentives

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Step 2: Calculate Expected Benefits

2.1 Labor Efficiency Savings

Method:

1. List tasks ERP will automate or accelerate
2. Time saved per task × monthly frequency
3. Convert to FTE (Full-Time Equivalent) savings

Example:

Total savings/month ≈ 61,000 THB = 732,000 THB/year

2.2 Error Reduction Savings

Calculate the cost of pre-ERP errors:

• Inventory discrepancy costs (lost stock, over-ordering)
• Billing error costs (credit notes, disputes)
• Compliance penalty costs

2.3 Revenue Enhancement

Some ERP modules can directly increase revenue:

• CRM module → better lead conversion
• Demand forecasting → fewer stock-outs → capture more potential sales
• Better pricing intelligence → improved margins

2.4 Risk Reduction

Quantify the risks ERP reduces:

• PDPA compliance risk (penalties for data breaches)
• Audit risk (insufficient documentation)
• Key-person dependency risk (when one person holds all the knowledge and leaves)

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Step 3: Calculate ROI and Payback Period

Formulas

ROI (%) = (Total Benefit - Total Cost) / Total Cost × 100
Payback Period = Total Cost / Annual Benefit (years)
NPV = Σ (Year n Benefit / (1+r)^n) - Total Cost

(r = discount rate / company cost of capital)

Real SME Example

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Red Flags in ERP Proposals

Watch for these when reviewing vendor proposals:

• No current process assessment — proposing without understanding fit
• Unrealistically high ROI promises — "50% cost reduction in 6 months" rarely happens
• Hidden costs not mentioned — no discussion of training, data migration, productivity dip
• Extreme vendor lock-in — over-customized to the point where upgrades become impossible

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Summary

Good ERP decisions require serious ROI analysis — not gut decisions or "because our competitor does it."

Simple framework:

1. Calculate Total Cost of Ownership including all hidden costs
2. Quantify measurable benefits — not just assumptions
3. Calculate payback period and 3–5 year ROI
4. Assess implementation risk

If the payback period exceeds 4–5 years or ROI is unclear, evaluate alternatives first.

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Need an ERP feasibility assessment for your business? Talk to the Adowbig team before committing.