Quest for the Dragonballs

Goku: 10

Goku Ozouru: 100

22nd Budoukai

Jackie Chun (Kame-sennin): 139

Goku: 180

Tenshinhan: 180

Tsurusennin: 120

23rd Budoukai

Goku: 260

Piccolo Daimaou: 260

Dragonball Z Movies & Specials

Bardock Special

Bardock: 8,000

Toma: 6,000

Ozouru Bardock: 80,000

Ozouru Toma: 60,000

Chibi Vegeta: 5,000

Bardock (on Planet Meet): Just under 10,000

Kakarotto: 2

Dudoria's Henchmen on Planet Meat: < 8,000

Dudoria: Anywhere from 10,000 to 21,000

Furiza: 530,000

Trunks Special

Android 17: 60,000,000

Android 18: 60,000,000

Super Saiya-jin Gohan: 70,000,000

Super Saiya-jin Trunks: 35,000,000

Here, the Android's power levels are based on the guesses from the Android saga.
Since Gohan can almost take on both of them, he probably has around 70,000,000.

Dragonball Z Episodes

Raditsu vs. Farmer

Raditsu: 1,200

Farmer with Shotgun: 5

Raditsu vs. Goku and Piccolo

Raditsu: 1,200

Piccolo (with weighted clothing) : 322

Piccolo (without weighted clothing) : 408

Piccolo's Makankosappo (1st Try) : 1,330

Piccolo's Makankosappo (2nd Try) : 1,440

Goku (with weighted clothing) : 334

Goku (without weighted clothing) : 416

Goku (with Kamehameha) : 924

Gohan: 1 to 1,307 (power changes w/ emotions)

After the Battle

Kame-sennin: 139

Kame-sennin's Turtle: 0.001

Kuririn: 206

Tenshinhan: 250

Yamucha: 177

Piccolo: 329

Z Fighters vs. Saibamen and Nappa

Saibamen: 1,200

Yamucha: 1,480

Kuririn: 1,083

Piccolo: 1,220

Gohan: 981

Gohan's Masenko: 2,800

Goku vs. Vegeta and Nappa

Goku: 5,000

Goku Powered Up: 8,000

Goku Kaioken x1: 12,000

Goku Kaioken x2: 16,000

Goku Kaioken x3: 24,000

Goku Kaioken x4: 32,000

Nappa: 4,000

Vegeta: 18,000

Ozouru Vegeta: 180,000

Ozouru Gohan: 9,810

Gohan and Kuririn vs. Furiza's Thugs

Gohan: 1,500

Kuririn: 1,500

Furiza's Men: < 500

Vegeta vs. Kui

Vegeta: 24,000

Kui: 18,000

Dudoria & Zarbon vs. Namek Fighters

Zarbon: 23,000

Dudoria: 21,000

Namek Fighters: 3,000

Vegeta vs. Dudoria

Vegeta: 24,000

Dudoria: 21,000

Vegeta vs. Zarbon (1st time)

Vegeta: 24,000

Zarbon: 23,000

Zarbon Monster: 33,000

Vegeta vs. Zarbon (2nd time)

Vegeta: 35,000

Zarbon: 23,000

Zarbon Monster: 33,000

Vegeta, Gohan, Kuririn vs. Ginyu Force

Kuririn: "over 10,000"

Gohan: "over 10,000"

Gohan's Masenko: "above 20,000"

Vegeta: 20,000

Vegeta: "almost 30,000"

Gerudo: 10,000

Rikum: 40,000

Goku vs. Ginyu Force

Goku (Scouter): 5,000

Goku vs Jese and Burter: bursts of 60,000

Goku vs Ginyu: max power of 180,000

Jese: 50,000

Burter: 45,000

Rikum: 40,000

Ginyu: 120,000

Goku in Ginyu's Body

Ginyu in Goku's Body: 23,000

Jese: 50,000

Vegeta: 60,000

Kuririn: 16,500

Gohan: 17,000

Nail vs. Furiza

Nail: 42,000

Furiza (form 1): 530,000

Vegeta vs. Furiza (1st Time)

Vegeta: 300,000

Furiza (form 1): 530,000

Furiza (form 2): 1,000,000

Piccolo vs. Furiza

Piccolo (merged with Nail): 800,000

Furiza (form 2): 1,000,000

Furiza (form 3): 2,500,000

Vegeta vs. Furiza (2nd Time)

Vegeta: 1,000,000

Furiza (form 4 - 33.33%): 4,000,000

Goku vs. Furiza

Furiza (form 4 - 33.33%): 4,000,000

Furiza (form 4 - 50%): 6,000,000

Furiza (form 4 - 70%): 8,400,000

Furiza (form 4 - 100%): 12,000,000

Goku's Base Level: 300,000

Goku Kaioken x10: 3,000,000

Goku Kaioken x20: 6,000,000

Super Saiya-jin Goku: 15,000,000

Furiza's Levels as he Fights Goku:

Furiza Goku

33% Kaioken x10

33% (short time), 50%, and 70% Kaioken x20

70% and 100% Super Saiya-jin Goku

Trunks vs King Cold and Furiza Bot

King Cold: 13,000,000

Furiza Bot: 12,500,000

Trunks (Supressed): 5

Super Saiya-jin Trunks: 17,000,000

Super Saiya-jin Goku: 20,000,000

GUESSES

Android Saga

Super Saiya-jin Goku (not sick): 25,000,000

Super Saiya-jin Goku (sick): < 10,000,000

Super Saiya-jin Trunks: 20,000,000

Super Saiya-jin Vegeta: 23,000,000

Piccolo: 8,000,000

Gohan: 1,000,000

Android 16: 40,000,000

Android 17: 35,000,000

Android 18: 35,000,000

Android 19: 10,000,000

Android 20: 5,000,000

Piccolo (after merging with Kami): 40,000,000

Cell (after absorbing humans): 45,000,000

Cell (after absorbing Android 17): 65,000,000

Super Saiya-jin Vegeta (after room of spirit and time): 80,000,000

Ultra Super Saiya-jin Trunks: 130,000,000

Perfect Cell : 125,000,000

Cell Game

Piccolo: 55,000,000

Super Saiya-jin Vegeta: 100,000,000

Super Saiya-jin Trunks: 105,000,000

Super Saiya-jin Gohan: 110,000,000

Super Saiya-jin Goku: 120,000,000

Super Saiya-jin 2 Gohan: 325,000,000

Perfect Cell : 125,000,000

Super Perfect Cell: 300,000,000

Buu Saga

Piccolo: 180,000,000

Super Saiya-jin Gohan: 275,000,000

Super Saiya-jin Vegeta: 340,000,000

Super Saiya-jin Goku: 360,000,000

Chibi Trunks: 35,000,000

Goten: 30,000,000

Super Saiya-jin Chibi Trunks: 95,000,000

Super Saiya-jin Goten: 90,000,000

Android 18: 60,000,000

Kaioshin: 250,000,000

Kibit: 225,000,000

Yamoo: 10,000,000

Supopovitch: 10,000,000

Dabura: 275,000,000

Fat Buu: 380,000,000

Majin Vegeta: 360,000,000

Super Saiya-jin 3 Goku: 450,000,000

Majin Buu: 390,000,000

Gotenks: 250,000,000

Super Saiya-jin Gotenks: 300,000,000

Super Saiya-jin 3 Gotenks: 410,000,000

Majin Buu (w/ Super Saiya-jin 3 Gotenks & Piccolo): 500,000,000

Gohan's Zet sword: 360,000,000

Mystic Gohan: 450,000,000

Majin Buu (w/ Trunks, Goten & Piccolo): 400,000,000

Majin Buu (w/ Piccolo, Trunks, Goten & Gohan): 550,000,000

Vegetto: 600,000,000

Kid Buu: 500,000,000

Goku's Chaou Genkidama: 550,000,000