Unit conversions
Convert between the units people actually search for — 208 conversions across 14 categories. Every page gives the exact factor and its source, a full table, a worked example, and the reverse.
Weight
24 pairsKilograms, pounds, grams, ounces and stone.
kg to lbs1 kg = 2.2046 lblbs to kg1 lb = 0.453592 kgg to oz1 g = 0.035274 ozoz to g1 oz = 28.3495 gst to lbs1 st = 14 lblbs to st1 lb = 0.0714286 stkg to st1 kg = 0.157473 stst to kg1 st = 6.3503 kgkg to g1 kg = 1,000 gg to kg1 g = 0.001 kgoz to lbs1 oz = 0.0625 lblbs to oz1 lb = 16 ozg to lbs1 g = 0.00220462 lblbs to g1 lb = 453.5924 goz to kg1 oz = 0.0283495 kgkg to oz1 kg = 35.274 ozmg to g1 mg = 0.001 gg to mg1 g = 1,000 mgmcg to mg1 mcg = 0.001 mgmg to mcg1 mg = 1,000 mcgtonnes to kg1 t = 1,000 kgkg to tonnes1 kg = 0.001 ttonnes to lbs1 t = 2,204.6226 lblbs to tonnes1 lb = 0.000453592 t
Length
27 pairsCentimetres, inches, metres, feet, miles and millimetres.
cm to inches1 cm = 0.393701 ininches to cm1 in = 2.54 cmm to feet1 m = 3.2808 ftfeet to m1 ft = 0.3048 mkm to miles1 km = 0.621371 mimiles to km1 mi = 1.6093 kmmm to inches1 mm = 0.0393701 ininches to mm1 in = 25.4 mmm to yards1 m = 1.0936 ydyards to m1 yd = 0.9144 mfeet to inches1 ft = 12 ininches to feet1 in = 0.0833333 ftyards to feet1 yd = 3 ftcm to mm1 cm = 10 mmm to cm1 m = 100 cmkm to m1 km = 1,000 mmm to cm1 mm = 0.1 cmmiles to m1 mi = 1,609.344 mmiles to feet1 mi = 5,280 ftfeet to miles1 ft = 0.000189394 mim to mm1 m = 1,000 mmmm to m1 mm = 0.001 mcm to feet1 cm = 0.0328084 ftfeet to cm1 ft = 30.48 cmm to inches1 m = 39.3701 ininches to m1 in = 0.0254 mfeet to yards1 ft = 0.333333 yd
Temperature
6 pairsCelsius, Fahrenheit and Kelvin.
Volume
26 pairsMillilitres, cups, litres, gallons and cooking spoons.
ml to cups1 mL = 0.00422675 cupcups to ml1 cup = 236.5882 mLliters to gallons1 L = 0.264172 galgallons to liters1 gal = 3.7854 Loz to ml1 fl oz = 29.5735 mLml to oz1 mL = 0.033814 fl oztbsp to ml1 tbsp = 14.7868 mLtsp to ml1 tsp = 4.9289 mLliters to ml1 L = 1,000 mLml to liters1 mL = 0.001 Lgallons to quarts1 gal = 4 qtpints to liters1 pt = 0.473176 Lquarts to liters1 qt = 0.946353 Lcups to oz1 cup = 8 fl oztbsp to tsp1 tbsp = 3 tspcups to liters1 cup = 0.236588 Lgallons to ml1 gal = 3,785.4118 mLml to gallons1 mL = 0.000264172 galtbsp to cups1 tbsp = 0.0625 cupquarts to cups1 qt = 4 cupliters to cups1 L = 4.2268 cupquarts to gallons1 qt = 0.25 galpints to ml1 pt = 473.1765 mLgallons to cups1 gal = 16 cupcubic feet to gallons1 ft³ = 7.4805 galcubic meters to liters1 m³ = 1,000 L
Speed
12 pairsMiles per hour, km/h, m/s and knots.
mph to kmh1 mph = 1.6093 km/hkmh to mph1 km/h = 0.621371 mphmps to kmh1 m/s = 3.6 km/hkmh to mps1 km/h = 0.277778 m/sknots to mph1 kn = 1.1508 mphknots to kmh1 kn = 1.852 km/hmps to mph1 m/s = 2.2369 mphmph to fps1 mph = 1.4667 ft/sfps to mps1 ft/s = 0.3048 m/smps to fps1 m/s = 3.2808 ft/smph to knots1 mph = 0.868976 knkmh to knots1 km/h = 0.539957 kn
Digital storage
16 pairsBytes, kilobytes, megabytes, gigabytes and terabytes.
mb to gb1 MB = 0.001 GBgb to mb1 GB = 1,000 MBgb to tb1 GB = 0.001 TBkb to mb1 kB = 0.001 MBmb to kb1 MB = 1,000 kBtb to gb1 TB = 1,000 GBbytes to bits1 B = 8 bitbits to bytes1 bit = 0.125 Btb to gib1 TB = 931.3226 GiBgb to gib1 GB = 0.931323 GiBkb to bytes1 kB = 1,000 Bbytes to kb1 B = 0.001 kBmb to mib1 MB = 0.953674 MiBtb to tib1 TB = 0.909495 TiBgb to kb1 GB = 1,000,000 kBkb to gb1 kB = 0.000001 GB
Area
20 pairsSquare feet, square metres, acres and hectares.
sqft to sqm1 ft² = 0.092903 m²sqm to sqft1 m² = 10.7639 ft²acres to sqft1 ac = 43,560 ft²acres to sqm1 ac = 4,046.8564 m²hectares to acres1 ha = 2.4711 acacres to hectares1 ac = 0.404686 hasqkm to sqmi1 km² = 0.386102 mi²sqmi to sqkm1 mi² = 2.59 km²sqin to sqcm1 in² = 6.4516 cm²sqm to sqkm1 m² = 0.000001 km²sqm to sqcm1 m² = 10,000 cm²hectares to sqm1 ha = 10,000 m²sqft to sqin1 ft² = 144 in²hectares to sqft1 ha = 107,639.1042 ft²sqm to sqyd1 m² = 1.196 yd²sqyd to sqft1 yd² = 9 ft²sqft to acres1 ft² = 0.0000229568 acsqm to acres1 m² = 0.000247105 acsqmi to acres1 mi² = 640 acacres to sqmi1 ac = 0.0015625 mi²
Pressure
17 pairsPsi, bar, kilopascals, mmHg and atmospheres.
psi to bar1 psi = 0.0689476 barbar to psi1 bar = 14.5038 psipsi to kpa1 psi = 6.8948 kPakpa to psi1 kPa = 0.145038 psibar to kpa1 bar = 100 kPaatm to bar1 atm = 1.0133 baratm to psi1 atm = 14.6959 psibar to atm1 bar = 0.986923 atmpsi to pa1 psi = 6,894.7573 Pakpa to bar1 kPa = 0.01 barmmhg to kpa1 mmHg = 0.133322 kPakpa to mmhg1 kPa = 7.5006 mmHgmmhg to psi1 mmHg = 0.0193368 psimbar to bar1 mbar = 0.001 barkpa to atm1 kPa = 0.00986923 atmatm to kpa1 atm = 101.325 kPammhg to bar1 mmHg = 0.00133322 bar
Energy
12 pairsCalories, kilojoules, kilowatt-hours and BTU.
kcal to kj1 kcal = 4.184 kJkj to kcal1 kJ = 0.239006 kcalcal to j1 cal = 4.184 Jj to cal1 J = 0.239006 calkwh to j1 kWh = 3,600,000 Jkj to cal1 kJ = 239.0057 calbtu to kwh1 BTU = 0.000293071 kWhbtu to j1 BTU = 1,055.0559 Jkj to j1 kJ = 1,000 Jkwh to kcal1 kWh = 860.4207 kcalwh to kwh1 Wh = 0.001 kWhkwh to wh1 kWh = 1,000 Wh
Power
10 pairsKilowatts, horsepower, watts and BTU per hour.
Force
6 pairsNewtons, pounds-force, kilograms-force and kilonewtons.
Angle
6 pairsDegrees, radians, gradians and revolutions.
Frequency
7 pairsHertz, kilohertz, megahertz, gigahertz and rpm.
Time
19 pairsSeconds, minutes, hours, days and weeks.
minutes to seconds1 min = 60 shours to minutes1 h = 60 mindays to hours1 d = 24 hweeks to days1 wk = 7 dhours to seconds1 h = 3,600 sdays to minutes1 d = 1,440 minminutes to hours1 min = 0.0166667 hseconds to minutes1 s = 0.0166667 minhours to days1 h = 0.0416667 dyears to days1 yr = 365.25 ddays to years1 d = 0.00273785 yryears to weeks1 yr = 52.1786 wkyears to months1 yr = 12 momonths to years1 mo = 0.0833333 yrmonths to days1 mo = 30.4375 ddays to months1 d = 0.0328542 moweeks to months1 wk = 0.229979 momonths to weeks1 mo = 4.3482 wkdays to weeks1 d = 0.142857 wk
Common questions
Are these conversions exact?
Where the units are defined exactly — a pound is exactly 0.45359237 kg — the factor is exact. Otherwise it is carried to full precision and rounded only for display, and every page cites its source.
What are the most searched conversions?
cm to inches, kg to lbs and Celsius to Fahrenheit are among the most looked-up; all three are one click above.
Do the table and the calculator ever disagree?
No. The full table and the live converter on each page use the same engine, so the numbers always match.