In this system of measurement, some of the units of length were:
| 12 inches | 1 foot. |
| 3 feet | 1 yard. |
| 5280 feet | 1 mile. |
| 1760 yards | 1 mile. |
There was only one reference in the series to this unit of measurement. In Sand, Servalan pulled the muzzle of Tarrant's gun to her forehead and said that at a distance of 'one inch', the shot should be 'even more efficient'. In that context, it was probably used colloquially, and was not a reference to an exact inch.
There were 4 references to this unit:
| Episode | Reference |
|---|---|
| Weapon | Servalan advanced on Coser, first saying that IMIPAK's range would be 'about eight feet', |
| Servalan, as she moved closer to Coser, estimated the range as 'four' feet. | |
| Sarcophagus | Avon answered Tarrant's question as to where he had been, saying that he had been outside 'about twenty feet' down the corridor. |
| Sand | Tarrant told Servalan that he was 'a fascinating shot. Particularly at a distance of three feet'. |
There were 6 references to this unit:
| Episode | Reference |
|---|---|
| Pressure Point | Vila estimated that the distance to the blockhouse was 'fifty yards, maybe more'. |
| Gambit | Chenie told Docholli (Kline) that it was 'only fifty yards' to the ship. |
| Traitor | Avandor said that Igin was probably on the Federation's detector screens before he got 'fifty yards'. |
| Stardrive | Avon said that he was planning to get as close as 'Fifty yards' to the asteroid. |
| Vila exclaimed, 'Fifty yards!?' | |
| In Warlord | Tarrant said that he and Vila were 'about thirty yards' from the mouth of the tunnel. |
There were 30 references to this unit:
| Episode | Reference |
|---|---|
| The Way Back | Blake told Varon that he and others walked 'about three miles' beyond Sub 43 to the meeting place with Foster and the Outsiders. |
| Varon told Ven Glynd that Blake went 'about three miles' beyond Sub 43. | |
| Project Avalon | Cally reported that Avalon's signal had changed position by 'eight miles'. |
| Bounty | Tyce told Blake that there were deserted mine workings 'About twenty miles' away. |
| Orac | Orac reported to Ensor that a space vehicle had made a surface landing 'about seven miles inland'. |
| Shadow | Blake said that the moon disc gardens were 'about half a mile away'. |
| Weapon | Coser said that IMIPAK had a range of 'up to a million miles'. |
| Coser said that if a marked man was within 'a million miles' he could be killed anytime 'you want without even seeing him again'. | |
| Later in the same episode, in response to Servalan's threat that she would see that Rashel and the clone would never leave the planet, Rashel's response was that she should do so from 'at least a million miles' away. | |
| Horizon | Blake ordered that he and Jenna be put down 'two miles from the landing field'. |
| Pressure Point | Blake ordered he be put down at a point 'about a mile away' from the rendezvous with Kasabi. |
| Travis said that Blake and the others had not got far, being 'Couple of miles [away] at the most'. | |
| Killer | Cally reported that Avon and Vila were 'a mile' from the Q-Base. |
| Tynus was told that the ship 'won't come nearer [the planet] than two hundred thousand miles'. | |
| Countdown | Avon said that the bomb could be anything up to 'ten thousand miles' from here. |
| Cauder remarked that the position of the device was 'four thousand miles' away. | |
| Volcano | Avon said that the Federation commandos teleported with Cally and Orac 'About two miles due north' of Tarrant and Dayna's present position. |
| City at the Edge of the World | Vila pointed to the two inhabitants of Kezarn that the buildings were 'miles' away. |
| Terminal | Toron told Reeval that there was something moving 'about a quarter of a mile' behind Avon. |
| Traitor | Slave announced that they (the Scorpio crew) were holding station 'forty miles' from the surface. |
| Animals | Justin told Avon that he and Dayna were 'half a mile' southwest of the bunker, prisoners in a Federation ship. |
| Sand | Servalan said that they were supposed to be positioned 'half a mile' from Keller's base. |
| Casgo, the pilot, said that he 'barely held the ship; the base was 'about five miles to the north'. | |
| Gold | Keiller said that the two plainclothes guards 'stand out a mile'. |
| Orbit | Slave reported that they (the Scorpio's crew) were 'ten miles' above the planet Malodar. |
| Avon ordered Tarrant to being the ship down to rendezvous with him and Vila at 'three hundred miles'. | |
| Soolin said that the ellipse of the shuttle's flight path was three degrees lower than it should be. 'That's something like a mile!' | |
| Egrorian explained that when the shuttle carrying Avon and Vila ran out of fuel, it would hit the ground in a marshy area 'some two hundred and seven miles' west of the base. | |
| Egrorian said that Avon and Vila were 'sixty four miles' high. | |
| Blake | Avon said that the heat tracers in the bounty hunters' flyer could, at night, pick up normal body heat within a radius of 'two miles'. |
In this system of measurement, some of the units of length were:
| 10 millimetres | 1 centimetre. |
| 100 centimetres | 1 metre. |
| 1000 metres | 1 kilometre. |
There was just one reference to this unit. In City at the Edge of the World, Orac said that the tracer intended for Vila was under the box, which was 'ten centimetres' from Avon's right hand.
| Episode | Reference |
|---|---|
| Moloch | Orac said that the focal centre of the computer control room was 'precisely seven metres west of the entrance to this room'. |
| Later in the episode, Avon mentioned 'seven meters due west of the entrance', which would be precisely, he said, that thing here', pointing at the hemisphere containing Moloch. | |
| Power | Orac asked to be moved at least 'seven hundred and forty two metres' from the launch chamber door. |
| Traitor | Igin said that because the flood level below the city was still too high, the fourth column of freedom fighters would still need to tunnel 'over three hundred metres' to get under the Magnetrix terminal and lay explosive charges. |
| Later in the same episode, when Hunda said that he would swim under the reactors, Avandor said that it would mean 'Fifty metres' underwater in almost total blackness. |
| Episode | Reference |
|---|---|
| Cygnus Alpha | Zen announced that the Liberator was in stationary orbit, 'one thousand spacials' above the planet's surface. |
| Time Squad | Zen said that the projectile's distance was 'One million seventy three thousand spacials' and closing. |
| Blake ordered Zen to lock off on the projectile on 'one hundred spacials'. | |
| Zen announced that Liberator was in stationary orbit 'one thousand spacials' above Saurian Major. | |
| The Web | Zen said that the Liberator had covered a distance of 'One hundred spacials'. |
| Zen said that if the Federation ships maintained their present course and speed, they would pass at a range not exceeding 'two million spacials'. | |
| Mission to Destiny | Blake ordered Zen to take them in to 'two hundred spacials'. |
| Blake ordered Zen to take them in to 'one hundred spacials'. | |
| Duel | the mutoid confirmed the Liberator's orbit as 'one thousand spacials' from the planet's surface. |
| Travis gave the order, 'Attack formation, fifteen hundred spacials trajectory'. | |
| after finding out about Travis's ambush, Jenna said that the Liberator's maximum range was 'about eight million spacials'. | |
| Project Avalon | Zen reported that the interceptors were 'two million spacials' away. |
| Redemption | Zen said that the battle computers proposed an evasive course: a planetary orbit at 'two thousand spacials'. |
| Blake ordered Zen to make it 'one thousand [spacials]'. | |
| Vila said that the 2 ships were 'Fifty thousand spacials' away. | |
| Horizon | Zen said that the Federation freighter was 'Five hundred spacials' away. |
| Zen said that, taking the course and speed for avoidance into account, the Liberator would be 'One hundred and fifty spacials' from the freighter at the nearest. | |
| Zen said that the Federation pursuit ships were 'Four hundred spacials' away. In Hostage, Cally said that the two hostile craft were 'five hundred spacials' and closing. | |
| Cally said that the two craft were now 'Two hundred spacials' distant and closing fast. | |
| Cally said that two more pursuit ships were 'Four hundred spacials' distant and closing. | |
| Cally said that the four new pursuit ships were at 'Four hundred spacials' and closing. | |
| Zen said that the nearest pursuit ship was 'Nine hundred spacials' away. | |
| Voice from the Past | Zen said that Asteroid PK118 had a diameter of 'zero point one zero two spacials'. |
| Dawn of the Gods | Avon ordered Cally to jam any signals from any ships within 'ten million spacials'. |
| Tarrant ordered Zen to report any ship or unaccountable object within six million spacials. | |
| Zen said that the dust cloud was 'one million two hundred thousand spacials' away. | |
| The Harvest of Kairos | Zen said that a parallax scan showed another alien craft at 'half a million spacials'. |
| Zen told Tarrant that the interceptors were at 'Eight million spacials'. | |
| Servalan said to Jarvik that it was one thing to sit in a control room 'a million spacials' from the action. | |
| Sarcophagus | Zen reported that the alien vessel was stationary at 'Two hundred spacials'. |
| Ultraworld | Cally said that the object was 'Three million spacials' away. |
| Avon said that they would put the Liberator into orbit 'a thousand spacials' from the artificial planet. | |
| Moloch | Zen reported that Sardos was located at 'two thousand spacials'. |
| Zen reported three alien spacecraft 'two million spacials' away. | |
| Zen reported 'One million spacials'. |
A unit based on the distance light travels in a year, referred to 4 times in the series:
| Episode | Reference |
|---|---|
| Killer | Blake wondered why the ship K47 would suddenly appear 'thousands of light years away'. |
| Terminal | Tarrant commented that they must be 'light years' away from any populated planet. |
| City at the Edge of the World | the recorded voice of the builder of the vault's security system told Vila and Kerril that they were on a starship, now 'at least three thousand light years' away. |
| Orbit | Egrorian showed Avon and Vila a lunar satellite of Porthodos, in the next constellation to this one, 'some seventeen light years' distant, before he destroyed it with the tachyon funnel. |
While references 1, 3, and 4 would appear to be light years with reference to Earth years, the builder of the vault in City was presumably referring to Kezarn years, although this could have been otherwise, as his recording was able to translate Vila and Kerril's speech.
Used to measure distances in deep space, it was mentioned twice:
Artix told Raiker in Space Fall that the London's scanner's range was 'about five subsecs on the high-D grid' Leylan, in the same episode, ordered that the London be put on a new course with a 'three subsec margin' from the outer limits of the space battle.
While a subsec might have been divisions of a parsec (3.262 light years), this is speculation, and no information was given on whether it was used outside of the Federation. (See SUBSEC.)