How to estimate overseas shipping costs?

How to estimate overseas shipping costs?
We are professional global machine tool accessories manufacture factory, we manufacture high quality products to our global customers by favorable price and fast delivery service.
Our product is small and light, so Global Express delivery is one of the most common way of our global business to customers.
We cooperate with well-known Global Express companies like DHL, TNT and others.
They always help us to deliver our product within 7 days to our global customers,
According to the distance between our customers and Taiwan,
The transportation cost can be divide into 8 zones by nearer or farther.
(It is basicly reference to DHL Express deliver rate)

Zone 1 - ex:Hong Kong, Macao
Zone 2 - ex:South Korea, Singapore, Japan
Zone 3 - ex:Indonesia, Malaysia, Philippines, Thailand, Vietnam
Zone 4 - ex:India, Sri Lanka, Australia, New Zealand, Pakistan
Zone 5 - ex:USA, Canada
Zone 6 - ex:Austria, Belgium, Switzerland, Germany, Denmark, Spain, United Kingdom, Hungary, Italy, Netherlands, Norway, Poland, Portugal, Sweden, Slovakia
Zone 7 - ex:UAE, Argentina, Brazil, Bhutan, Ecuador, Egypt, Peru, Turkey, Saudi Arabia
Zone 8 - ex:Afghanistan, Poland, Switzerland, Romania, Russia, Morocco, Yemen, Panama

We have good relationship with our global customers in many countries such as : India, Netherlands, Pakistan, Thailand, Singapore, Indonesia, Canada, UAE, Malaysia, Vietnam, Hong Kong, Philippines...etc.
We are very glad we can be part of your success.