Raditz: 1,200
Farmer: 5
The farmer has no chance againts the superior Saiyan and his gun is no match for Raditz
Piccolo vs. Raditz
Raditz: 1,200
Piccolo: 322
Piccolo's Ki Blast: 360
This short battle takes place after Raditz locates a large power level on his scouter while searching for Goku so he flies there. Instead Raditz finds Piccolo and they exchange words and Piccolo fires a blast at Raditz which to Piccolo's suprise has no effect at all on Raditz. Luckily for Piccolo tough Raditz locates
Goku, Gohan & Piccolo vs. Raditz
Raditz: 1,200
Raditz's Double Ki Blast: 1,500
Piccolo (with weighted clothing): 322
Piccolo (without weighted clothing): 408
Piccolo's Special Beam Cannon (1st try): 1,330
Piccolo's Special Beam cannon (2nd try): 1,440
Goku (with weighted clothing): 334
Goku (without weighted clothing): 416
Goku's Kamehameha: 924
Gohan: 1 - 1,307 (his power level changes with his emotions)
Gohan (Raditz's Scouter): 710
Goku and Piccolo have no chance against Raditz until Piccolo uses his special beam cannon and Gohan gets angry and headbuts Raditz weakening him enough so Piccolo can use his special beam cannon. Raditz's double ki blast was two separate blasts fired at the same time (one of which removed one of Piccolo's arm).
After the Battle with Raditz
Master Roshi: 139
Master Roshi's Turtle: 0.001
Krillin: 206
Piccolo: 329
Yamcha: 177
Tien: 250
Chaozu: 145
Yajirobe: 181
Kami: 301
King Yemma: 15,000
King Kai: 20,000
Chi Chi: 92
All the official power levels (the ones in blue) are taken from where Bulma uses Raditz's repaired scouter to find out Master Roshi, Turtle's and Krillin's powers as well as to find Tien, Yamcha and Piccolo. As for the others well Kami, Chaozu, Chi Chi's power levels are based on those power levels from the previous martial arts tournament while King Yemma's power level is based on the facts that a) he bet Raditz b) Kami notes that King Kai's power level is stronger than King Yemma's and c) King Kai states that Goku would have to be stronger than he is to beat the Saiyans and since Vegeta (the strongest saiyan) has a power level of 18,000 then I figure King Kai and King Yemma have power levels between 1,300 and 19,000
Gohan (Ozouru - 1st time): probably between 7,000 and 10,000
Gohan (after survival training): 285
Gohan (Ozouru - 2nd time): 4,550
Gohan's first Ozouru was during his survival training when he woke up and looked at the full moon immediately transforming him into an Ozouru. Luckily Piccolo was able to stop Gohan (by destroying the moon). The second time was when the artificial moon was beamed out of Goku's old space pod again this was stopped by Piccolo. As stated in the manga Ozouru multiplies your power level by ten and to work out Gohan's first ozouru transformation I used Gohan's power level against Raditz while the other one was just a guess
Goku vs Ogres of Hell
Goku: 300
Goku (after eating King Yemma's fruit): 832
Goz: 150
Mez: 150
This battle occurs when Goku falls off snakeway and into hell (a little note here - it says "HELL" on the ogres t-shirts in the Japanese version but in the American version it says "HFIL"! also its not called "HELL" its called "the home for infinite losers"). Goku is easily able to outrun and wrestle these two and he gains a great power up after eating King Yemma's fruit.
Vegeta and Nappa vs. Arlians
Vegeta: 18,000
Vegeta's Planet Destroying Ki Blast: 21,000
Nappa: 4,000
Nappa's Super Bakuhatsuha: 7,000
Arlian Soldiers: 200 each
King Moai: 400
Yeti (Giant Arlian): 1,000
Vegeta and Nappa totally annihilate the Arlians and their planet. I don't think that Vegeta (or Nappa) gained any power from this fight as they really didn't have to try! and if they did it would be little (probably less than 100)
Z Warriors vs. Two Illusion Saiyans
Yamcha's Power Ball: 700
Tien's Multiform Kikoho: 375 each
Illusion Saiyans: 1,800 each
These power levels are from the various training by the Z warriors at Kami's palace. The Illusion Saiyans have power levels lower than Nappa (as it was stated that the Saiyans comming to Earth are twice as strong).
Chaozu: 610
Chaozu's Kamikaze: 1,000
Yamcha: 1,480
Yamcha's Kamehameha: 1,200
Yamcha's Energy Ball: 1,300
Tien: 1,830
Tien's Kikoho: 2,900
Gohan (pre battle): 981
Gohan's Masenko: 2,800
Krillin (pre battle): 1,083
Krillin's Destructo Disk: 1,200
Krillin's Kakusandan: five 1,400 blasts
Krillin's Kamehameha: 1,300
Krillin (max): 1,770
Piccolo (pre battle): 1,220
Piccolo's Multiform: 406 each
Piccolo's Saiko No Kogeki: 1,500
Piccolo's Special Beam Cannon: 2,000
Piccolo (max): 3,500
Saibamen: 1,200 each
Saibamen Kamikaze: 1,500
Nappa: 4,000
Nappa's Saiko No Kogeki: 6,000
The Z warriors finally face the Saiyans and there little green things. Krillin, Tien and Piccolo make short work of the Saibamen but a surprise attack kills Yamcha. In the fight with Nappa, Chaozu attempts to destroy him by using a kamikaze (self destruct) but it fails, Tien goes all out and runs out of power and Piccolo sacrifices himself to save Gohan whew! A few notes here though the first one is to explain the "pre battle" power levels these are the person before the battle while the "max" levels indicate the highest level reached in the battle due to using a special attack. The un-official levels work around the official ones. I think that a kamikaze attack raises your power level as how would of a Saibaman (power level 1,200) kill Yamcha (power level 1,480)?
Goku vs. Nappa
Goku: 5,000 (normal)
Goku (powered up): 8,000
Nappa: 4,000
Vegeta: 18,000
Goku finally arrives although too late to save Tien, Yamcha, Tien and Piccolo and in just enough time to save Gohan. Nappa is no match for Goku though and Goku easily beats him and after being defeated Vegeta doesn't see the point in having him around anymore and kills him which is not nice at all
Goku, Gohan, Krillin & Yajirobe vs. Vegeta
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
Goku's Spirit Bomb (energy lost): 17,000
Vegeta: 18,000
Vegeta's Gallic Gun: 35,000
Vegeta's Final Flash: 28,000
Vegeta Ozouru: 180,000
Vegeta (extremely weak): 356
Gohan (after senzu bean): 1,120
Gohan Ozouru: anywhere between 9,810 and 28,000
Krillin (after senzu bean): 1,240
Krillin (weak): 358
Yajirobe: 1,150
What a fight! Goku is crushed by Ozouru Vegeta, Vegeta is hit by Goku's partial spirit bomb and then crushed by Ozouru Gohan. Leaving the surviving Z Fighters (especially Goku) completely bashed up and majorly injured. How I got these? Well I've been to a lot of sites where Gohan and Krillin healed by the senzu beans have powers of about 3,000 well let me tell you right now that is WRONG! We next hear official Gohan and Krillin power levels on Namek and they are at 1,500 so how can they have a level lower than when they were on Earth! Also no one really knows what a persons power level is when they are weak! those are just guesses. As stated in the manga Kaioken multiplies the users power level by the respective amount (except for Kaioken x1) also stated Kaioken gives the user a great increase in speed and a slight increase in power so it can be assumed that Kaioken x1 raises your power level by 1.5 and finally as stated in the manga being in Ozouru form multiplies your power level 10 times.