How This Calculator Works
This calculator estimates two budget line items in parallel and then sums them. The first is data migration, the work of pulling your records out of the current system, transforming them into Odoo's model, loading them, and reconciling every balance back against the source. The second is implementation, the work of standing up Odoo itself: modules, permissions, training, and go-live. The two run side by side on almost every project, but they have different cost drivers, so we show them split before merging them.
On the migration side, four multiplicative levers (source system, history depth, record volume, data quality) apply to a base hour count set by the source. Two additive levers stack on top: integrations to rebuild and custom modules to port. The resulting hours convert to USD at a blended $175/hr rate that reflects the actual mix on a migration team: senior data architect, ETL engineer, QA, and accounting reconciliation.
On the implementation side, we reuse the multipliers from the implementation cost calculator verbatim, because at equal scope the implementation cost is the same whether you're migrating or starting fresh. Base of $350 per user, module multiplier that kicks in at module four, complexity 1.0x to 2.1x, customization 1.0x to 1.9x. Each band has a low at 80% of the midpoint and a high at 130%, because most projects land near the high side, not the middle.
The Real Cost Drivers Behind Migration
After 60+ migrations into Odoo, the same pattern repeats: the source system decides the order of magnitude, and everything else plays at the margin. Here is how each lever plays out in the field.
Source System: The Data Model Gap
This is the most brutal lever. Migrating from QuickBooks is typically 40 to 70 hours because QuickBooks' model is flat: customers, vendors, items, invoices, payments. Migrating from SAP Business One is 250 to 400 hours because SAP's model stacks UDFs (User-Defined Fields), UDTs (User-Defined Tables), BOM versions with effective dating, multi-warehouse with per-site valuation rules, and partner add-ons (Beas, Boyum, Coresuite) that need to be inventoried one by one before anything can be mapped.
NetSuite lands in the middle (150 to 250 hours) because the model is consistent but deep: custom SuiteScripts, SuiteFlow workflows, saved searches that have quietly become business-critical reports. Custom databases (Access, in-house SQL) are the most variable: 100 to 400 hours depending on how much cleanup the source needs before it can be imported.
History Depth: The Reconciliation Tax
Loading just the opening balances is the cheapest and fastest path: you take the last closed fiscal year's trial balance, import it as an opening journal entry, and start transacting in Odoo day one. Most CFOs regret that choice six months later because they can no longer produce year-over-year comparisons in Odoo. Loading 1 to 3 years of transactional history adds about 40% to the effort. Loading 7+ years more than doubles it, because every migrated fiscal year has to be reconciled back to the source: three fiscal years means three UAT cycles, three reconciliation rounds.
Record Volume: The Effort Changes Class
Under 10K records, you load in a single batch via Odoo's native imports (xlsx, csv) and validate visually. Between 10K and 100K, you build parameterized transformation scripts and reconcile in batches. Past 1M, you switch to an ETL pipeline through an intermediate staging DB, because the cutover window has to stay under 48 hours and a 1M-row xlsx import never finishes inside that window. At 1M+, you also parallelize imports across multiple Odoo workers to fit the window.
Data Quality: The Silent Multiplier
Clean data is rare. Across 60+ migrations, we have seen exactly one perfectly clean source, and it was a system that had never been used in production. The norm is "typical": 5 to 10% duplicate customers, product codes reused over the years, two or three chart-of-accounts versions layered on top of each other. "Messy" is more common than people admit: 20%+ duplicates, free-text fields used as pseudo-structured tags, naming conventions that changed three times, orphan rows pointing to deleted records. Each quality step adds roughly 30% to the effort, because the cleanup has to be documented, automated, and applied repeatably on every dry run.
Integrations to Rebuild: Not in the Base Hours
If your current system pushes or pulls data to Shopify, Stripe, ADP, EDI, a banking connector, or a shop-floor scheduling system, each of those flows has to be rewired against Odoo. We budget roughly 60 hours per integration on average: authentication, payload mapping, error handling with exponential backoff, monitoring and centralized logs, plus three UAT rounds to catch edge cases. Six integrations or more adds 600 additive hours, because the cost grows non-linearly when multiple integrations have to coexist without fighting over the same records.
Custom Modules to Port: Inherited Customization Debt
Anything that is not standard in your current system has to be replayed inside Odoo. NetSuite SuiteScript, Sage custom formulas, SAP add-ons, Crystal Reports, hand-rolled Access views: each piece demands a decision. We rebuild, replace with a native Odoo feature, or retire outright. Most clients discover at this stage that 30 to 50% of their inherited customization is no longer in use. We strip out the dead code during discovery, then we quote only what survives. The additive range (0 to 500 hours) reflects what survives the cull.
Typical Migration Scenarios
Four anonymized scenarios pulled from our 2024-2026 Octura archive, with the actual cost bands and lived timelines. Names are changed, the numbers are not.
Scenario 1: QuickBooks Online to Odoo, 5 users, $18K to $28K
A professional-services firm in Texas, 5 users, QuickBooks Online for 4 years, clean. We loaded opening balances at January 1 plus 18 months of transactional history to enable quarterly comparisons. No integrations to rebuild, one custom report to port (a custom invoice). Migration: 60 hours. Implementation: CRM + Sales + Accounting, simple complexity, light customization. Total billed: $22,800 across 7 weeks.
Scenario 2: NetSuite to Odoo, 25 users, $75K to $115K
A multi-warehouse distributor in Quebec, 25 users, NetSuite for 6 years. The client was leaving NetSuite to escape the annual license hike. Six critical SuiteScripts to rebuild in Odoo Python, EDI 850/856 integration with their main retail customer, payroll connector to Nethris. We loaded 3 years of transactional history plus all open records. Volume: 350K records (M-L). Typical-quality data with a few years of customer duplicates to clean. Migration: 480 hours. Implementation: Sales, Inventory, Purchase, Accounting, HR (5 modules), moderate complexity. Total billed: $94,200 across 18 weeks. License ROI: migration paid back in 14 months.
Scenario 3: SAP Business One to Odoo, Single-Plant Manufacturer, $130K to $200K
A food-processing manufacturer in Ontario, 35 users, SAP B1 for 9 years with three partner add-ons (Beas for shop-floor scheduling, Boyum for UX, Coresuite for service). We inventoried the add-ons during discovery and planned their replacement with Odoo 19 native capabilities (tablet Work Centers for Beas, native UI for Boyum, helpdesk for Coresuite). 5 years of transactional history, volume L (480K records), typical quality. Three integrations: EDI to wholesalers, scale-weighing connector, Nethris payroll. Seven Crystal Reports ported to QWeb. Migration: 920 hours. Implementation: Sales, Purchase, Inventory, MRP, Quality, Accounting, HR (7 modules), moderate complexity. Total billed: $162,500 across 22 weeks.
Scenario 4: SAP S/4HANA to Odoo, Multi-Company, $450K to $1.2M
A US industrial group, 110 users across three legal entities (parent + two subsidiaries), SAP S/4HANA Cloud for 4 years. Volume XL (1.8M records), 6 years of history required for consolidated reporting. Messy quality: three chart-of-accounts versions layered through acquisitions. Five integrations to rebuild (EDI, banking, ADP, two customer portals), twelve custom modules to port. Migration: 2,100 hours. Implementation: full multi-company stack, 100+ users, complex complexity, heavy customization. Total billed: $825,000 across 38 weeks. Peak team: 9 people including 2 dedicated full-time migration engineers. These are the projects where the calculator pushes to the high band because of the compounding of complexity × customization × volume.
What This Calculator Does Not Cover
If you're leaving an older Odoo version rather than a third-party system, use the Odoo upgrade cost calculator. The cost profile of an Odoo-to-Odoo version upgrade (say 8 to 17) is fundamentally different from a NetSuite or SAP migration: no data-model gap, but cost that stacks with every version jump.
Odoo license subscription. You pay Odoo S.A. directly, per user per month, for Standard (~$31) or Custom (~$47). A 25-user Custom project is roughly $14,160/year, which we keep out of the calculator because it doesn't transit through us.
Hosting. Odoo.sh runs $25-$400/month depending on tier, or self-hosted on AWS/GCP/Azure runs $150-$2,000/month depending on instance size and environments.
Change management. If your team needs to redesign a workflow rather than port it as-is, that is upstream consulting that we quote separately, because the deliverable is a process, not software.
Post-live support. Monthly retainer from $2,500/month for small clients, or ad-hoc support at our standard hourly rate. See the <NuxtLink :to="localePath('/technical-support-policy')">technical support policy</NuxtLink>.
Next Steps After Your Estimate
The calculator gives you a realistic ballpark. The next step is a 30-minute scoping call with a senior Odoo architect, not a sales rep. We walk through your source system, challenge your integration list, flag the custom modules that can quietly disappear, and send you a fixed-price SOW within 48 hours.
Book a Free 30-Min Scoping Call →