Create weight based shipping based on "per gram"

Hi,

I am new to opencart and would need some help on weight based shipping.

I want opencart to calculate weight based shipping based on "dollar per weight" in differnet ranges. For example, if total weight is between 0 to 200g, dollar per Gram is US$0.028. In such case when the order has an exact weight of, let's say 150g, the system can calculate it as 150*0.028 = US$4.2.

Then another dollar per weight will apply for 200-500g range. is it possible?
This is a big obstacle for me now and i really appreciate someone can help me out...thanks!!!

You can't do that with the built-in weight based shipping, but you can do it with my Weight-Based Shipping extension. You would set up brackets like this (where your default weight class is grams):

From: 0, To: 200, Charge: 0.028, Per (g): 1
From: 200, To: 500, Charge: 0.030, Per (g): 1
etc.

can i set two different weight based shipping cost, for example

Normal airmail:
between 0 to 200g, dollar per Gram is US$0.028.
between 201 to 500g, dollar per gram is US$0.025

Fast airmail:
between 0 to 200g, dollar per Gram is US$0.045.
between 201 to 500g, dollar per gram is US$0.042

Yes, you would set it up as I said in my last point, and then create another shipping rate called "Fast Airmail" with the higher charges.

I added this string in WEIGHT BASED SHIPPING. So if i have this right it should calculate how much weight (KG) i have when check-out and then multiply it with 1$. But the system give me this warning "Warning: No Shipping options are available. Please contact us for assistance!".

From: 0, To: 999999, Charge: 1.00, Per (kg): 1 (not working)


The next is working. The weight is 640 Kg so shipping returns 200 $.
1:100, 640:200 (working)

Whats is going wrong with the first option with FROM - TO input?

I think you may have confused my Weight-Based Shipping extension with the built-in Weight Based Shipping. Use the link to check out the differences -- the built-in one is not capable of doing per-weight-unit calculations.

Ok, so to make it clear now.

In order to make a weight-based shipping (the buid in one) i should put a price for each KG seperate and its not possible to let this build-in module make logical decission itself. Right?

So the only thing i can do is for each KG make a separate entry string? (see below)

1:1.00, 2:2.00,3:3.00 etc (till we get 1000 KG) ...what can give a very long entry (don't know if this is even possible to entry there).

Yes, you would need to make a bracket for each kilogram, like you've suggested. It should store the data fine, it just takes a long time to type it all out.