This is the power levles as the z fighters as the progress.

Farmer with gun in start of series : 5

Raditz vs. Piccolo and Goku

Raditz : 1,200
Piccolo: 408
Piccolo's specail beam cannon: 1,330
Goku: 416
Goku (with Kamehameha): 924
Gohan: 700 to 1,307 (when he gets mad)

Nappa and Saiba men vs z fighters

Nappa: 4,000
Saibamen: 1,200
Yamucha: 1,480
Tien: 1,400
Kuririn: 1,083
Piccolo: 1,220
Gohan: 981
Gohan's Masenko: 2,800

Goku vs Vegita and Nappa

Nappa: 4,000
Vegeta: 18,000
Goku: 5,000
Goku Powered Up: 9,500
Goku Kaioken x1: 12,000
Goku Kaioken x2: 16,000
Goku Kaioken x3: 24,000
Goku Kaioken x4: 32,000
Ozouru Vegeta: 180,000

Vegeta fighting Dudoria

Vegeta: 24,000
Dudoria: 21,000

Vegeta fighting Zarbon (first battle)

Vegeta: 24,000
Zarbon: 23,000
Zarbon Monster: 33,000

Vegeta, Gohan and Kuririn fighting Ginyu Force

Kuririn: 10,000+ (after gruru's blessing)
Gohan: 10,000+ (after gruru's blessing)
Gohan's Masenko: 20,000+
Vegeta: 30,000
Gerudo: 10,000
Rikum: 40,000

Vegeta fighting Zarbon (second battle)

Vegeta:35,000
Zarbon: 23,000
Zarbon Monster: 33,000

Gokou fighting Ginyu Force

Goku fighting Jese and Burter: 60,000
Goku fighting Ginyu: 180,000
Jese and Burter: 60,000
Ginyu: 120,000

Nail fighting Freeza

Nail: 42,000
Freeza : 530,000

Vegeta fighting Freeza (first battle)
Vegeta: 300,000
Freeza (form 1): 530,000
Freeza (form 2): 1,000,000

Piccolo fighting Freeza

Piccolo (merged with Nail): 800,000
Freeza in first transformation (form 2): 1,000,000
Freeza in second transformation (form 3): 2,500,000

Vegeta fighting Freeza (2nd Time)

Vegeta: 1,000,000
Freeza in third transformation , using 33% power: 4,000,000

Gokou fighting Freeza Freeza in third transformation ,using 33% power:

4,000,000 Freeza in third transformation , using 50% power: 6,000,000
Freeza in third transformation ,using 70% power: 8,400,000
Freeza in third transformation , full force: 12,000,000
Gokou: 300,000 Gokou Kaioken x10: 3,000,000
Gokou Kaioken x20: 6,000,000
Super Saiya-jin Gokou: 15,000,000

Trunks and Gokou fighting King Cold and Freeza Bot

King Cold:13,000,000 Freeza Bot: 12,500,000
Trunks (Supressed): 5
Super Saiya-jin Trunks: 17,000,000
Super Saiya-jin Gokou: 20,000,000