conclusion ?? you wish !!
India's official ranges for different missiles
Agni I - 850km ( 1000 kg warhead) (1 stage)
Agni II- 2000 km ( 1500 kg warhead) ( 2 stages)
Agni III - 3500 km ( 1500 kg warhead) (2 stages )
Agni V- 5000 km ( unpublished warhead weight) ( 3 stages)
All the above mentioned ranges for strategic missiles are for laymen journalists, arm chair experts of different forums and also for non-proliferation experts who are on India's back to sign CTBT and FCT (Fissile cut off treaty)
Experts who know missile science can also interpret the above mentioned range vs payload in a more detailed manner.
A missile's range depends on number of factors. It could depend on the weight of the missile, warheads, number of stages of missile, fuel and amount of composite materials used.
let us just take one factor. The weight of the warhead !!
50% reduction in payload doubles the range. India has a wide range of warheads, that is from 100 to 1000 kg warheads. Choice of warhead, depends on the value of the target, distance and so on..
for instance
1. Agni I (single stage missile)
850 km @ 1000 kg
1700 km @ 500 kg
3400 km @ 250 kg
2. Agni II ( 2 stages)
2000 km @ 1500 kg
4000 km @ 750 kg
8000 km @ 350 kg
3. Agni III ( 2 stages)
3500 km @ 1500 kg
7000 km @ 750 kg
14,000 km @ 350 kg
4. Ever wonder why nobody talks about Agni IV??
Agni IV is nothing but the 3 stages variants of Agni III (A,B,C)
Agni III- (3 stages)
4000 km @ 3000 kg ( Heavy payload due to 3 stages)
8000 km @ 1500 kg
16,000 km @ 750 kg
5. Why do we need Agni V ??? since Agni III can even reach the US?
well, Agni III at 16,000 km carries only 750 kg payload. This payload will be increased for Agni V.
Agni V (Agni V specifications are not published yet. We are looking at speculative figures)
4000 km @ 4000 kg
8000 km @ 2000 kg
16,000 km @ 1000 kg
There is no such thing as Surya missile, since Agni II, Agni III and
Agni V can take care of the whole world.