partitioning - Is there any possible (and simple) way to delete my Windows partitions and extend my Ubuntu partitions?

I want to know is there any possible (and simple) way to delete my Windows partitions and extend my Ubuntu partitions.

I have 1 HDD 700 GB:

• sda1 primary 100MB NTFS (Windows boot partition)


• sda2 primary 100GB NTFS (Windows 7 OS)


• sda3 primary 500GB NTFS (Windows data files)


• sda4 extended partition 98GB:


• sda6 ext4 94GB (Ubuntu 12.04)


• sda5 swap 4GB

My actual boot partition is sda1

I want do delete Windows partitions and extend my Ubuntu installation to the whole HDD, maybe creating only /home and /boot partition additional, so I have:

• sda1 /boot partition (500MB)


• sda2 / partition (200GB)


• sda3 /home partition (489,5GB)


• sda4 swap (10GB)

Is there any way to do it without reinstall whole system ?