Tiered shipping rates by subtotal, weight, or item count — per geo zone, with multiple service options (Standard, Two Day, Next Day) each having their own price brackets.

OpenCart's built-in flat-rate shipping gives you one price per zone. Real stores need more: a different price for a $20 order than a $500 order, and three or four service tiers (Standard, Two Day, Next Day) that the customer picks from at checkout.

Flat Shipping Rates – Slabs does both. Configure as many shipping options per geo zone as you want — each with its own pricing tiers — and let your customers self-select at checkout. Bill by order subtotal, total weight, or total items in cart — your choice.

Example configuration for a store:

Domestic (US)
Standard Shipping $0–$25: $4.95 | $25.01–$50: $8.95 | $50.01+: $15.95
Two Day Shipping $0–$25: $18.95 | $25.01–$50: $20.95 | $50.01+: $29.95
Next Day Shipping $0–$25: $39.95 | $25.01–$50: $44.95 | $50.01+: $59.95

International
Standard $0–$50: $24.95 | $50.01+: $44.95

A US customer with a $30 cart sees three shipping options ($8.95 / $20.95 / $44.95) and picks the one they want. An international customer sees one option at the right international rate.

Key features
✅ Multiple shipping options per geo zone — Standard, Express, Next Day, anything else
✅ Tiered pricing — different rate for each subtotal / weight / quantity band
✅ Three calculation modes — subtotal, total items, or total weight
✅ Unlimited geo zones — works with OpenCart's built-in Geo Zone system
✅ Unlimited tiers per option — no cap on rate brackets
✅ Tax-class aware — apply a tax class to shipping if needed
✅ Validated input — clear error messages on malformed rates; no silent $0 quotes at checkout
✅ AJAX admin save — no page reloads while configuring
✅ Bootstrap 5 admin UI — matches OpenCart 4's native look

Perfect for

Any stores with domestic + international zones and multiple delivery speeds
B2B stores where larger orders get different per-item rates
Heavy-goods retailers (weight-based pricing with tiered breaks)
Anyone who has outgrown OpenCart's default single-rate flat shipping

BOOST YOUR SITE RANKING



Change Log
---------
05-Feb-2011:
- Modified documentation to include decimals

08-March-2011:
- Now it supports geo zones.
- Configure multiple number of shipping options
- Now supports weight based shipping charges

05-Feb-2011:
- Modified documentation to include decimals

08-March-2011:
- Now it supports geo zones.
- Configure multiple number of shipping options
- Now supports weight based shipping charges

21-May-2011:
- Added support for cart quantity

06-November-2012:
- Fixed TAX calculation issue

08-November-2014:
- Upgraded to support OpenCart V2.0


18-October-2016:
- Upgraded to support OpenCart V2.3.x

13-August-2017:
- Upgraded to support for OpenCart 3.x.x


16-May-2026:
- Upgraded to support for OpenCart 4.x.x