This list only includes the power levels for fighters fighting in the Dragonball Z and Dragonball GT series.
There were no power readings yet in the first Dragonball series, below are all power levels listed.
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Saiyan Saga
Goku and Piccolo’s battle with Raditz
Farmer: 5
Gohan: 710 (Enraged 1,307)
Goku: 334
Krillin: 206
Master Roshi: 139
Piccolo: 322
Raditz: 1,220

Special Attacks:
Goku’s Kamehameha: 1,080
Piccolo’s Special Beam Cannon: 1,440
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Saiyan Saga
Battle with Nappa and Vegeta
Gohan 1,500
Goku 8,000
Krillin 1,600
Nappa 7,800
Piccolo 2,000
Saibamen 1,220
Tenshinhan 1,750
Vegeta 18,000
Vegeta Transformed 100,000
Yamcha 1,450

Special Attacks:
Tenshinhan’s Kikoho 2,500
Gohan’s Masenko 2,800
Son Goku’s Kaioken Attack 16,000
Son Goku Kaioken Attack x2 20,000
Son Goku Kaioken Attack x3 24,000
Vegeta’s Gyarikku-Ho 41,000
Son Goku Kaioken Attack x3 + Kamehameha 41,000
Son Goku Kaioken Attack x4 + Kamehameha 49,000
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Battle with Freeza’s Henchmen
Namekian Warriors – 1,000
Namekian Warriors – 3,000

Gohan – 1,500
Kuririn – 1,500

Kiwi – 18,000
Vegeta – 24,000

Dodoria – 20,000

Zarbon – 22,000
Monster Zarbon – 27,000

Vegeta – 28,000

Battle with the Ginyu Force
Gohan – 16,000
Kuririn – 14,000

Guldo – 140

Vegeta – 28,000
Reacoom – 40,000

Volume 8
Reacoom - 40,000
Son Gohan - 11,500
Kuririn - 10,500

Son Goku - 5,000 (Could burst his power up to 10fold Kaioken when necessary)
Jheese - 40,000
Butta - 40,000

Son Goku - 90,000
Captain Ginyu - 120,000
Son Goku [Kaioken] - 180,000

Volume 9
Ginyu in Goku - 23,000
Kuririn - 24,500
Gohan - 27,000

Jheese - 40,000
Vegeta - 260,000

Nail - 42,000
Freeza - 220,000 (Holding back from full power)

Vegeta - 340,000
Freeza - 400,000 (Powered up)

Freeza - 530,000 (Full Power)
Freeza - 1,060,000 (2nd Form)

Gohan - 1,100,000
Kuririn - 37,000

Freeza - 1,400,000 (Powered up)
Piccolo - 1,500,000

Volume 10
Freeza - 1,700,000 (Full Power)
Piccolo - 1,850,000 (Full Power)

Freeza - 2,300,000 (Form 3)
Gohan - 2,000,000 (Enraged)

Freeza - 3,500,000 (True Form)
Vegeta - 2,500,000

Son Goku - 3,300,000

Freeza - 6,000,000 (50%)
Son Goku [Kaioken x20] - 6,600,000

Son Goku [Kamehameha] - 5,500,000

Volume 11
Piccolo - 2,800,000
Genki Dama - 8,000,000

Super Goku - 11,500,000

Freeza - 8,400,000 (70%)
Freeza - 12,000,000 (100%)

Freeza - 10,000,000 (Battle Worn)

Volume 12
Cyborg Freeza - 6,500,000
King Cold - 4,800,000

Trunks - 5 (Supressed)
Super Trunks - 11,500,000

Super Goku - 13,500,000

Volume 13
Yamcha - 58,000

Nineteen - 4,000,000
Super Goku - 7,500,000

Nineteen - 7,000,000 (Post-Kamehameha)
Super Goku - 6,000,000

Super Vegeta - 16,500,000
Nineteen - 8,500,000

Super Vegeta [Big Bang Attack] - 14,000,000
Super Vegeta - 9,000,000 (After Defeating Nineteen)

Twenty - 10,000,000
Piccolo - 13,000,000

Volume 14
Eighteen - 23,000,000
Super Vegeta - 16,500,000

Super Trunks - 14,000,000
Piccolo - 13,000,000
Tenshinhan - 950,000
Seventeen - 28,000,000

Cell - 15,000,000
Piccolo - 22,000,000

Volume 15
Seventeen - 28,000,000
Piccolo - 28,000,000

Cell - 34,000,000
Sixteen - 34,000,000

Imperfect Cell - 47,000,000

Volume 16
Ultra Vegeta - 62,000,000
Ultra Trunks - 60,000,000

Perfect Cell - 90,000,000
Ultra Vegeta [Final Flash] - 125,000,000

Volume 17
Ultra Trunks 2 - 85,000,000
Perfect Cell - 90,000,000
Ultra Trunks 2 - 120,000,000 (Full Power)

Super Goku - 65,000,000

Mister Satan - 8

Volume 18
Full Power Super Goku - 140,000,000
Perfect Cell - 145,000,000

Super Goku [Warp Kamehameha] - 190,000,000

Full Power Super Gohan - 150,000,000
Perfect Cell - 165,000,000

Cell Juniors - 145,000,000
Ultra Vegeta - 125,000,000
Ultra Trunks - 115,000,000
Piccolo - 78,000,000

Super Gohan 2 - 300,000,000

Volume 19
Super Gohan 2 - 300,000,000
Cell Juniors - 145,000,000

Full Power Perfect Cell - 180,000,000
Buff Perfect Cell - 220,000,000
Imperfect Cell - 47,000,000

Super Perfect Cell - 225,000,000
Super Gohan 2 - 200,000,000 (Injured)

Super Perfect Cell [Kamehameha] - 350,000,000
Super Gohan 2 [Kamehameha] - 345,000,000

Great Saiyaman

Super Gohan - 78,000,000
Great Saiyaman - 19,500,000

Videl - 8

Super Goten - 67,000,000

World Tournament
Son Goten - 17,500,000
Trunks Briefs - 20,000,000

Super Goten - 70,000,000
Super Trunks - 80,000,000

Kuririn - 2,300,000

Piccolo - 16,000,000
Kaioshin - 45,000,000

Videl - 9
Spopovich - 16

Gohan - 25,000,000
Super Gohan - 100,000,000
Super Gohan 2 - 200,000,000

Kibito - 35,000,000

Babidi’s Spaceship
Vegeta - 70,000,000
Pui Pui - 6,000,000

Yakon - 48,000,000
Son Goku - 60,000,000
Super Goku - 180,000,000

Dabura - 250,000,000
Super Gohan 2 - 250,000,000

Majin Vegeta - 360,000,000
Super Goku 2 - 360,000,000

The Hatching
Majin Buu - 600,000,000

Super Gohan 2 - 250,000,000
Dabura - 170,000,000 (Injured)
Kaioshin - 45,000,000
Majin Vegeta - 360,000,000

Majin Vegeta [Final Explosion] - 800,000,000

Super Goku 3 - 1,080,000,000
Majin Buu - 850,000,000

Gotenks - 400,000,000
Majin Buu - 1,000,000,000

Super Gotenks - 1,200,000,000

Fusion
Evil Buu - 720,000,000
Mister Buu - 400,000,000

Super Buu - 4,000,000,000

Gotenks - 500,000,000
Super Gotenks - 1,500,000,000
Super Gotenks 3 - 4,500,000,000

Son Gohan - 5,200,000,000

Super Buu Gotenks - 6,000,000,000
Super Buu Piccolo - 4,050,000,000
Super Buu Gohan - 6,700,000,000

Vegito - 26,000,000,000

Evil Kid Buu
Super Buu - 4,000,000,000
Buff Buu - 4,600,000,000
Kid Buu - 720,000,000

Super Goku 3 - 720,000,000
Super Vegeta 2 - 280,000,000
Mister Buu - 400,000,000

Genki Dama - 22,000,000,000

Son Goku - 90,000,000
Uub - 12 (Relaxed)
Uub - 85,000,000 (Enraged)