• 1 foot per second squared (ft/s²) = 0.3048 metre/second squared (m s^-2)

• 1 Degrees proof (uk) (°) = 0.5714 % vol
• 1 Degrees proof (us) (°) = 0.5 % vol

• 1 Gradian (Grad) = 0.9 degrees (°)
• 1 milli-radian (mRad) = 0.0573 degrees (°)
• 1 Minute (') = 0.01667 degrees (°)
• 1 Quadrant (Quad) = 90 degrees (°)
• 1 Radian (Rad) = 57.3 degrees (°)
• 1 Revolution (rev) = 360 degrees (°)
• 1 Second (") = 0.0002778 degrees (°)

• 1 acre = 4047 square metre (m²)
• 1 are (a) = 100 square metre (m²)
• 1 hectare (ha) = 10000 square metre (m²)
• 1 perch = 25.29 square metre (m²)
• 1 rood = 1012 square metre (m²)
• 1 square centimetre (cm²) = 0.0001 square metre (m²)
• 1 square foot (sq.ft) = 0.0929 square metre (m²)
• 1 square inch (sq.") = 0.0006452 square metre (m²)
• 1 square kilometre (km²) = 1000000 square metre (m²)
• 1 square mile (sq.M) = 2590000 square metre (m²)
• 1 square yard (sq.yd) = 0.8361 square metre (m²)

• Body Mass Index = mass (Kg) ÷ height(m)²

• 1 aberampere (aA) = 10 ampere (A)
• 1 Biot (Bi) = 10 ampere (A)
• 1 statampere = 3.33564 x 10^-10 ampere (A)

• 1 kilometres per gallon (us) = 264.2 metres/litre (m L^-1)
• 1 kilomtres per gallon (uk) = 354 metres/litre (m L^-1)
• 1 kilomtres per litre = 1000 metres/litre (m L^-1)
• 1 miles per gallon (us) = 425.1 metres/litre (m L^-1)
• 1 miles per gallon (uk) = 0.354 metres/litre (m L^-1)
• 1 miles per litre = 1609 metres/litre (m L^-1)

• 1 British Thermal Unit (BTU) = 1055 joule (J)
• 1 Electron Volt (eV) = 1.602E-19 joule (J)
• 1 erg (erg) = 0.0000001 joule (J)
• 1 foot pound force = 1.356 joule (J)
• 1 gram calorie = 4.184
• 1 therm = 105500000 joule (J)
• 1 watt hour (W h) = 3600 joule (J)

• 1 dyne = 0.00001 Newton (N)
• 1 gram force = 0.009807 newton (N)
• 1 pound force = 4.448 newton (N)
• 1 ton-force (uk) = 9964 newton (N)
• 1 tonne-force = 9609 Newton (N)

• 1 Angstrom (A) = 0.0000000001 metre (m)
• 1 atronomical unit (au) = 149600000000 metre (m)
• 1 barleycorn = 0.008467 metre (m)
• 1 cable (land) = 185.2 metre (m)
• 1 cable (long) = 219.5 metre (m)
• 1 cable (naut) = 182.9 metre (m)
• 1 cable (rn) = 185.3 metre (m)
• 1 chain = 20.12 metre (m)
• 1 cubit = 0.4572 metre (m)
• 1 degree (°) = 111100 metre (m)
• 1 digit = 0.01905 metre (m)
• 1 ell = 1.143 metre (m)
• 1 fathom = 1.829 metre (m)
• 1 finger = 0.02223 metre (m)
• 1 foot (ft) = 0.3048 metre (m)
• 1 furlong = 201.2 metre (m)
• 1 hand = 0.1016 metre (m)
• 1 inch (") = 0.0254 metre (m)
• 1 league (land) = 4828 metre (m)
• 1 league (naut) (uk) = 5560 metre (m)
• 1 lightyear = 9461000000000000 metre (m)
• 1 link = 0.2012 metre (m)
• 1 micron (µ) = 0.000001 metre (m)
• 1 mil = 0.0000254 metre (m)
• 1 mile (M) = 1609 metre (m)
• 1 mile (naut) (international) (n M) = 1852 metre (m)
• 1 mile (naut) (uk) (n M) = 1853 metre (m)
• 1 nail = 0.05715 metre (m)
• 1 pace (geometrical) = 1.524 metre (m)
• 1 pace (military) = 0.762 metre (m)
• 1 palm = 0.9144 metre (m)
• 1 parsec = 30860000000000000 metre (m)
• 1 perch = 5.029 metre (m)
• 1 pole = 5.029 metre (m)
• 1 rod = 5.029 metre (m)
• 1 rope = 6.096 metre (m)
• 1 shackle = 22.86 metre (m)
• 1 shaftment = 0.1524 metre (m)
• 1 span = 0.2286 metre (m)
• 1 thou = 0.0000254 metre (m)
• 1 vigrate = 5.029 metre (m)
• 1 yard (yd) = 0.9144 metre (m)

• 1 atomic mass unit (amu) = 1.661E-24 gram (g)
• 1 carat (uk) (ct) = 0.2592 gram (g)
• 1 carat (metric) (ct) = 0.2 gram (g)
• 1 cental = 45360 gram (g)
• 1 clove = 3175 gram (g)
• 1 dram (av) = 1.772 gram (g)
• 1 dram (ap) = 3.888 gram (g)
• 1 dram (tr) = 3.888 gram (g)
• 1 grain = 0.0648 gram (g)
• 1 Grain (ap) (gr) = 0.0648 gram (g)
• 1 grain (tower) (gr) = 0.04556 gram (g)
• 1 grain (tr) (gr) = 0.0648 gram (g)
• 1 hundredweight (hwt) = 50800 gram (g)
• 1 hundredweight (short) (hwt) = 45360 gram (g)
• 1 mark (tower) = 233.3 gram (g)
• 1 ounce (oz) = 28.35 gram (g)
• 1 ounce (ap) (oz) = 31.1 gram (g)
• 1 ounce (av) (oz) = 28.35 gram (g)
• 1 ounce (Tower) (oz) = 29.16 gram (g)
• 1 ounce (tr) (oz) = 31.1 gram (g)
• 1 pennyweight (dwt) = 1.555 gram (g)
• 1 pennyweight (tower) (dwt) = 1.458 gram (g)
• 1 pound (ap) (lb) = 373.2 gram (g)
• 1 pound (av) (lb) = 453.6 gram (g)
• 1 pound (Tower) (lb) = 349.9 gram (g)
• 1 pound (tr) = 373.2 gram (g)
• 1 quarter (uk) = 12700 gram (g)
• 1 quarter (us) = 11340 gram (g)
• 1 sack = 165100 gram (g)
• 1 scruple (ap) (s) = 1296 gram (g)
• 1 slug = 14590 gram (g)
• 1 stone (st) = 6350 gram (g)
• 1 tod = 12700 gram (g)
• 1 ton (t) = 1016000 gram (g)
• 1 ton (us) (t) = 907200 gram (g)
• 1 tonne = 1000000 gram (g)

• 1 bit (b) = 0.125 byte (B)
• 1 gigaByte (GB) = 1074000000 (B)
• 1 kiloByte (kB) = 1024 byte (B)
• 1 megaBit (Mb) = 131100 byte (B)
• 1 megaByte (MB) = 1049000 byte (B)
• 1 nibble (n) = 0.5 byte (B)
• 1 petaByte (PB) = 1126000000000000 byte (B)
• 1 terraByte (TB) = 1100000000000 byte (B)

• 1 brace = 2
• 1 dozen (doz) = 12
• 1 bakers dozen = 13
• 1 score = 20
• 1 gross = 144
• 1 centuary = 100
• 1 grand = 1000
• 1 google = 10¹⁰⁰
• 1 googleplex = ₁₀10¹⁰⁰
• 1 quire (paper) = 24 sheets
• 1 ream (paper) = 500 sheets
• 1 mole (chemistry) (mol) = 6.023 x 10²³

• 1 horsepower (hp) = 745.6999 watt (W)

• 1 Inch of water (in.h₂o) = 249.1 pascal (Pa)
• 1 millimetre of mercury (mm Hg) = 133.3 pascal (Pa)
• 1 bar = 100000 pascal (Pa)
• 1 torr = 133.3 pascal (Pa)
• 1 atmosphere (at) = 101300 pascal (Pa)
• 1 kilogram force per square centimetre = 98070 pascal (Pa)
• 1 pounds per square inch (psi) = 6895 pascal (Pa)

• 1 Rutherforrd (Ruth) = 0.000001 becquerel (Bq)

Approximate figures, ignoring Tax etc. and assuming
8 hour day, 5 day week, 12 month year, 52 week year

• £1 per hour = £8.00 per day
• £1 per hour = £40.00 per week
• £1 per hour = £173.33 per month
• £1 per hour = £2080.00 per year
• £1 per day = £0.125 per hour
• £1 per day = £5.00 per week
• £1 per day = £21.67 per month
• £1 per day = £260.00 per year
• £1 per week = £0.025 per hour
• £1 per week = £0.20 per day
• £1 per week = £4.33 per month
• £1 per week = £52.00 per year
• £1 per month = £0.00577 per hour
• £1 per month = £0.04615 per day
• £1 per month = £0.23077 per week
• £1 per month = £12 per year
• £1 per year = £0.00048 per hour
• £1 per year = £0.00385 per day
• £1 per year = £0.01923 per week
• £1 per year = £0.08333 per month

	Celcius	Farenheit	Kelvin
Celcius	°C	( F - 32 ) ÷ 1.8	K + 273.15
Farenheit	( °C x 1.8 ) + 32	F	( ( K - 273.15 ) x 1.8 ) + 32
Kelvin	°C + 273.15	( ( F - 32 ) ÷ 1.8) + 273.15	K
Centigrade (historic)	100 - °C	100 - ( ( F - 32 ) ÷ 1.8 )	173.15 - K
Note Celcius temperature readings are often mislabelled as Centigrade
Freezer ***	below -18	below 0	below 255
Freezer **	below -12	below 10	below 261
Freezer *	below -6	below 21	below 267
Fridge	below 4	below 39	below 277
Gas mark ¼ (uk)	107	225	380
Gas mark ½ (uk)	121	250	394
Gas mark 1 (uk)	135	275	408
Gas mark 2 (uk)	148	300	421
Gas mark 3 (uk)	162	325	435
Gas mark 4 (uk)	176	350	449
Gas mark 5 (uk)	190	375	463
Gas mark 6 (uk)	204	400	477
Gas mark 7 (uk)	218	425	491
Gas mark 8 (uk)	232	450	505
Gas mark 9 (uk)	246	475	519
Gas mark 10 (uk)	260	500	533

 

• 1 centuary(average) (cent) = 3154000000 second (s)
• 1 day (dy) = 86400 second (s)
• 1 decade(average) (dec) = 315400000 second (s)
• 1 fortnight (fn) = 1210000 second (s)
• 1 hour (hr) = 3600 second (s)
• 1 millennium(average) (mill) = 31540000000 second (s)
• 1 Minute (min) = 60 second (s)
• 1 month(average) (mo) = 2628000 second (s)
• 1 week (wk) = 604800 second (s)
• 1 year(average) (yr) = 31540000 second (s)

• 1 foot/second (ft/s) = 0.3048 meter/second (m s^-1)
• 1 kilometre/hour (kph) = 0.2778 meter/second (m s^-1)
• 1 Knot (nautical)(kn) = 0.5144 meter/second (m s^-1)
• 1 knot (uk)(kn) = 0.5148 meter/second (m s^-1)
• 1 light speed (c) = 299800000 meter/second (m s^-1)
• 1 mile/hour (mph) = 0.447 meter/second (m s^-1)
• 1 mach (sound-speed)(air) = 343 meter/second (m s^-1)

• 1 anker (brew) = 37.85 litre (L)
• 1 bag = 0.1091 litre (L)
• 1 barrel (uk) = 163.7 litre (L)
• 1 barrel (brew) = 160.4 litre (L)
• 1 barrel (oil) = 0.159 litre (L)
• 1 Barrel (wine) = 0.1432 litre (L)
• 1 barrel(wine) = 119.2 litre (L)
• 1 bottle (brew) = 0.75 litre (L)
• 1 bushel (uk) = 36.37 litre (L)
• 1 butt = 491 litre (L)
• 1 butt (126) = 0.5728 litre (L)
• 1 butt (brew) = 481.2 litre (L)
• 1 chalfton (uk) = 1.309 litre (L)
• 1 coomb (dry) = 145.5 litre (L)
• 1 cran = 170.5 litre (L)
• 1 cubic centimetre = 0.000001 litre (L)
• 1 cubic foot = 2.832 litre (L)
• 1 cubic inch = 0.01639 litre (L)
• 1 cubic yard = 764.6 litre (L)
• 1 cup (uk) = 0.0002841 litre (L)
• 1 drachm = 0.0004262 litre (L)
• 1 drop (ap) = 0.0000059 litre (L)
• 1 firkin = 40.91 litre (L)
• 1 firkin (brew) = 40.1 litre (L)
• 1 fluid drachms = 0.000003552 litre (L)
• 1 fluid ounce (fl.oz) = 0.02841 litre (L)
• 1 fluid scruple = 0.001515 litre (L)
• 1 gallon (uk) (g) = 4.546 litre (L)
• 1 gallon (us) = 3.788 litre (L)
• 1 gill = 0.1421 litre (L)
• 1 gill (uk) = 0.0001421 litre (L)
• 1 gill (uk) = 0.1421 litre (L)
• 1 hogshead = 245.5 litre (L)
• 1 hogshead (brew) = 240.6 litre (L)
• 1 hogshead (uk) = 245.5 litre (L)
• 1 kenning = 18.18 litre (L)
• 1 kenning (dry) = 18.18 litre (L)
• 1 kilderkin = 81.83 litre (L)
• 1 magnum (brew) = 1.5 litre (L)
• 1 methuslah (brew) = 6 litre (L)
• 1 minim (ap) = 0.000005919 litre (L)
• 1 minim (us) = 0.000006161 litre (L)
• 1 peck (us) = 8.81 litre (L)
• 1 peck (dry) = 9.092 litre (L)
• 1 pin = 20.46 litre (L)
• 1 pint (pt) = 0.5683 litre (L)
• 1 pint (uk) = 0.5683 litre (L)
• 1 pint (us) = 0.4736 litre (L)
• 1 pipe (wine) = 477 litre (L)
• 1 pottle (liquid) = 1.893 litre (L)
• 1 pottle (dry) = 2.273 litre (L)
• 1 quart (us) = 0.9464 litre (L)
• 1 quart (uk) = 1.137 litre (L)
• 1 rundlet(wine) = 68.14 litre (L)
• 1 stere = 1000 litre (L)
• 1 strike = 72.74 litre (L)
• 1 tablespoon (uk) = 0.00001776 litre (L)
• 1 teaspon (uk) = 0.000005919 litre (L)
• 1 tierce (wine) = 159 litre (L)
• 1 tun (wine) = 953.9 litre (L)

Prefix	Abbr	Meaning
quetta	Q		x 1030
ronna	R		x 1027
yotta	Y		x 1024
zetta	Z		x 1021
exa	E		x 1018
peta	P		x 1015
tera	T		x 1012
giga	G		x 109
mega	M		x 106
myria	my	x 10000	x 104
kilo	k	x 1000	x 103
hecto	h	x 100	x 102
deca	da	x 10	x 101
		1	x 100
deci	d	x 0.1	x 10-1
centi	c	x 0.01	x 10-2
milli	m	x 0.001	x 10-3
micro	µ		x 10-6
nano	n		x 10-9
pico	p		x 10-12
femto	f		x 10-15
atto	a		x 10-18
zepto	z		x 10-21
yocto	y		x 10-24
ronto	r		x 10-27
quecto	q		x 10-30