eCommerce Platform Cost Calculator

1. Understand the True Cost Structure

The advertised monthly price of an eCommerce platform is almost never the full story. A Shopify Basic subscription at $39/month can quickly become $200-400/month once you factor in payment processing fees (2.9%+30¢ per transaction), 3-5 essential apps ($85/month average), and basic developer support. This is why comparing Total Cost of Ownership (TCO) — not just subscription prices — is essential before committing to a platform.

Our calculator factors in every cost layer: the platform subscription, payment processing (Stripe 2.9%+30¢ is the industry standard, but some platforms add their own transaction fees on top), plugin and app costs, hosting fees for self-hosted platforms like WooCommerce and PrestaShop, theme investment amortized over time, and realistic developer maintenance costs.

2. Match Platform Strengths to Your Business Type

Direct-to-Consumer (DTC) brands building aspirational brands with strong design needs will thrive on Shopify. Its best-in-class storefront, 8,000+ app ecosystem, and built-in marketing tools are unmatched for DTC. The tradeoff: Shopify apps add up, and transaction fees with external gateways can be significant.

B2B and wholesale businesses have different needs — customer-specific pricing, quote management, purchase orders, and credit terms. Odoo eCommerce and BigCommerce stand out here. Odoo integrates eCommerce directly with your ERP, so wholesale pricing, inventory, and accounting flow automatically. BigCommerce offers strong B2B features natively without transaction fees.

Content-heavy businesses already on WordPress naturally gravitate to WooCommerce for the seamless CMS integration. The flexibility of 50,000+ WordPress plugins is unmatched, but requires more technical management than hosted platforms. Agencies often prefer WooCommerce for client stores because of the full control and absence of platform lock-in.

Enterprise and large catalog stores with complex product configurations, multiple storefronts, or millions of SKUs typically need Adobe Commerce (Magento) or Odoo. These platforms handle complexity that Shopify and WooCommerce struggle with at scale, though the TCO is significantly higher.

3. Calculate the Transaction Fee Impact

Transaction fees are often the biggest cost difference between platforms at scale. Consider a store with $100,000 in monthly GMV (Gross Merchandise Volume):

• Shopify Basic with Shopify Payments: 2.9%+30¢ per transaction = ~$2,900/month in processing fees alone
• Shopify Basic with external gateway: +2% platform fee = additional $2,000/month = $4,900/month total
• BigCommerce: No platform fee, just processor fees = ~$2,900/month
• WooCommerce: No platform fee, just Stripe fees = ~$2,900/month
• Squarespace Business: 3% platform fee + 2.9% processor = ~$5,900/month

This illustrates why BigCommerce is often the smartest choice for high-GMV stores that want a hosted SaaS solution without transaction fee exposure.

4. Factor in the App and Plugin Ecosystem

Every eCommerce platform has a base feature set, but most stores need additional capabilities — email marketing integration, loyalty programs, product reviews, advanced shipping rules, or SEO tools. These come from the app marketplace, and the costs add up:

• Shopify: 8,000+ apps, average store uses 3-5 paid apps at $10-50/month each = ~$85/month average
• WooCommerce: 50,000+ WordPress plugins, many free, but paid plugins for subscriptions, advanced filtering, memberships = ~$60/month
• Odoo: All 50+ business apps included in the monthly subscription — no additional app costs for ERP, CRM, POS, accounting, etc.
• Adobe Commerce: Marketplace extensions can cost $200-2,000+ each, plus annual renewal fees

5. Consider Migration Costs Before Switching

Platform migrations are a significant hidden cost that many merchants underestimate. Moving from one eCommerce platform to another involves: product catalog migration (with variants, images, and custom fields), customer data transfer, order history migration, SEO URL redirect mapping to preserve search rankings, theme rebuild or adaptation, and app/integration re-configuration.

Typical migration costs range from $2,000-$5,000 for a simple WooCommerce-to-Shopify migration to $50,000-$200,000+ for a complex Magento-to-Adobe Commerce or Magento-to-Odoo migration with ERP integration. This "switching cost" is why platform selection decisions should be made for your 3-5 year horizon, not just your current needs.

6. Platform Pricing Tiers Explained

Most eCommerce platforms use tiered pricing that scales with your store's capabilities and revenue:

• Shopify: Basic ($39) → Shopify ($105) → Advanced ($399) → Plus ($2,300+). Upgrade triggers are usually feature needs (advanced reporting, third-party calculated shipping) or desire for lower transaction rates.
• BigCommerce: Standard ($39) → Plus ($105) → Pro ($399) → Enterprise. Unlike Shopify, BigCommerce forces plan upgrades when annual revenue exceeds thresholds ($50K, $180K, $400K).
• Odoo: Priced per user/month with all apps included. Standard at $31.10/user/month, Custom (with customizations) at $46.70/user/month. A 5-user store costs $155-234/month but gets CRM, accounting, inventory, HR, and POS included — no separate subscriptions needed.