Convert units and check the math.
Pick a metric, imperial, lab, flow, visual acuity, temperature, area, or volume converter. Each page gives you the equation, a live result, a lookup table, and nearby unit pairs.
Every converter gives you the answer first, then shows the formula and a small table so you can sanity-check the result.
Conversions by measurement type
Pick a unit pair. You will get a calculator, examples, and a quick lookup table.
Grams to Kilograms
g → kg
kg = g × 0.001
Grams to Milligrams
g → mg
mg = g × 1000
Grams to Ounces
g → oz
oz = g × 0.0352739619496
Grams to Pounds
g → lb
lb = g × 0.00220462262185
Kilograms to Grams
kg → g
g = kg × 1000
Kilograms to Ounces
kg → oz
oz = kg × 35.2739619496
Kilograms to Pounds
kg → lb
lb = kg × 2.20462262185
Kilograms to Stone
kg → st
st = kg × 0.157473044418
Metric tons to Pounds
t → lb
lb = t × 2204.62262185
Milligrams to Grams
mg → g
g = mg × 0.001
Ounces to Grams
oz → g
g = oz × 28.349523125
Ounces to Kilograms
oz → kg
kg = oz × 0.028349523125
Ounces to Pounds
oz → lb
lb = oz × 0.0625
Pounds to Grams
lb → g
g = lb × 453.59237
Pounds to Kilograms
lb → kg
kg = lb × 0.45359237
Pounds to Metric tons
lb → t
t = lb × 0.00045359237
Pounds to Ounces
lb → oz
oz = lb × 16
Pounds to Stone
lb → st
st = lb × 0.0714285714286
Stone to Kilograms
st → kg
kg = st × 6.35029318
Stone to Pounds
st → lb
lb = st × 14
Centimeters to Inches
cm → in
in = cm × 0.393700787402
Centimeters to Meters
cm → m
m = cm × 0.01
Feet to Inches
ft → in
in = ft × 12
Feet to Meters
ft → m
m = ft × 0.3048
Feet to Yards
ft → yd
yd = ft × 0.333333333333
Inches to Centimeters
in → cm
cm = in × 2.54
Inches to Feet
in → ft
ft = in × 0.0833333333333
Inches to Meters
in → m
m = in × 0.0254
Inches to Millimeters
in → mm
mm = in × 25.4
Kilometers to Miles
km → mi
mi = km × 0.621371192237
Light-years to Parsecs
ly → pc
pc = ly × 0.306601393786
Meters to Centimeters
m → cm
cm = m × 100
Meters to Feet
m → ft
ft = m × 3.28083989501
Meters to Inches
m → in
in = m × 39.3700787402
Meters to Yards
m → yd
yd = m × 1.09361329834
Miles to Kilometers
mi → km
km = mi × 1.609344
Miles to Yards
mi → yd
yd = mi × 1760
Millimeters to Inches
mm → in
in = mm × 0.0393700787402
Parsecs to Light-years
pc → ly
ly = pc × 3.26156377717
Yards to Feet
yd → ft
ft = yd × 3
Yards to Meters
yd → m
m = yd × 0.9144
Yards to Miles
yd → mi
mi = yd × 0.000568181818182
Degrees Celsius to Degrees Fahrenheit
°C → °F
°F = (°C × 9/5) + 32
Degrees Celsius to Kelvin
°C → K
K = °C + 273.15
Degrees Fahrenheit to Degrees Celsius
°F → °C
°C = (°F - 32) × 5/9
Degrees Fahrenheit to Kelvin
°F → K
K = (°F - 32) × 5/9 + 273.15
Kelvin to Degrees Celsius
K → °C
°C = K - 273.15
Kelvin to Degrees Fahrenheit
K → °F
°F = (K - 273.15) × 9/5 + 32
Acres to Hectares
ac → ha
ha = ac × 0.40468564224
Acres to Square feet
ac → ft²
ft² = ac × 43560
Acres to Square miles
ac → mi²
mi² = ac × 0.0015625
Hectares to Acres
ha → ac
ac = ha × 2.47105381467
Hectares to Square meters
ha → m²
m² = ha × 10000
Square centimeters to Square inches
cm² → in²
in² = cm² × 0.155000310001
Square feet to Acres
ft² → ac
ac = ft² × 0.0000229568411387
Square feet to Square meters
ft² → m²
m² = ft² × 0.09290304
Square inches to Square centimeters
in² → cm²
cm² = in² × 6.4516
Square kilometers to Square miles
km² → mi²
mi² = km² × 0.386102158542
Square meters to Hectares
m² → ha
ha = m² × 0.0001
Square meters to Square feet
m² → ft²
ft² = m² × 10.7639104167
Square meters to Square yards
m² → yd²
yd² = m² × 1.1959900463
Square miles to Acres
mi² → ac
ac = mi² × 640
Square miles to Square kilometers
mi² → km²
km² = mi² × 2.58998811034
Square yards to Square meters
yd² → m²
m² = yd² × 0.83612736
Cubic feet to US gallons
ft³ → gal
gal = ft³ × 7.48051948052
Cubic inches to Liters
in³ → L
L = in³ × 0.016387064
Cubic meters to Liters
m³ → L
L = m³ × 1000
Liters to Cubic inches
L → in³
in³ = L × 61.0237440947
Liters to Cubic meters
L → m³
m³ = L × 0.001
Liters to Microliters
L → µL
µL = L × 1000000
Liters to Milliliters
L → mL
mL = L × 1000
Liters to US gallons
L → gal
gal = L × 0.264172052358
Liters to US pints
L → pt
pt = L × 2.11337641887
Liters to US quarts
L → qt
qt = L × 1.05668820943
Microliters to Liters
µL → L
L = µL × 0.000001
Microliters to Milliliters
µL → mL
mL = µL × 0.001
Milliliters to Liters
mL → L
L = mL × 0.001
Milliliters to Microliters
mL → µL
µL = mL × 1000
Milliliters to US cups
mL → cup
cup = mL × 0.00422675283773
Milliliters to US fluid ounces
mL → fl oz
fl oz = mL × 0.0338140227018
US cups to Milliliters
cup → mL
mL = cup × 236.5882365
US cups to US tablespoons
cup → tbsp
tbsp = cup × 16
US fluid ounces to Milliliters
fl oz → mL
mL = fl oz × 29.5735295625
US gallons to Cubic feet
gal → ft³
ft³ = gal × 0.133680555556
US gallons to Liters
gal → L
L = gal × 3.785411784
US pints to Liters
pt → L
L = pt × 0.473176473
US quarts to Liters
qt → L
L = qt × 0.946352946
US tablespoons to US cups
tbsp → cup
cup = tbsp × 0.0625
US tablespoons to US teaspoons
tbsp → tsp
tsp = tbsp × 3
US teaspoons to US tablespoons
tsp → tbsp
tbsp = tsp × 0.333333333333
Micromolar to Millimolar
µM → mM
mM = µM × 0.001
Micromolar to Molar
µM → M
M = µM × 0.000001
Micromolar to Nanomolar
µM → nM
nM = µM × 1000
Millimolar to Micromolar
mM → µM
µM = mM × 1000
Millimolar to Molar
mM → M
M = mM × 0.001
Molar to Micromolar
M → µM
µM = M × 1000000
Molar to Millimolar
M → mM
mM = M × 1000
Nanomolar to Micromolar
nM → µM
µM = nM × 0.001
Decimal acuity values to LogMAR values
decimal → logMAR
logMAR = -log10(decimal acuity)
Decimal acuity values to MAR values
decimal → MAR
MAR = 1 ÷ decimal acuity
Decimal acuity values to Snellen 20/x denominators
decimal → 20/x
20/x denominator = 20 ÷ decimal acuity
Decimal acuity values to Snellen 6/x denominators
decimal → 6/x
6/x denominator = 6 ÷ decimal acuity
LogMAR values to Decimal acuity values
logMAR → decimal
decimal acuity = 10^-logMAR
LogMAR values to MAR values
logMAR → MAR
MAR = 10^logMAR
LogMAR values to Snellen 20/x denominators
logMAR → 20/x
20/x denominator = 20 × 10^logMAR
LogMAR values to Snellen 6/x denominators
logMAR → 6/x
6/x denominator = 6 × 10^logMAR
MAR values to Decimal acuity values
MAR → decimal
decimal acuity = 1 ÷ MAR
MAR values to LogMAR values
MAR → logMAR
logMAR = log10(MAR)
MAR values to Snellen 20/x denominators
MAR → 20/x
20/x denominator = MAR × 20
MAR values to Snellen 6/x denominators
MAR → 6/x
6/x denominator = MAR × 6
Snellen 20/x denominators to Decimal acuity values
20/x → decimal
decimal acuity = 20 ÷ Snellen denominator
Snellen 20/x denominators to LogMAR values
20/x → logMAR
logMAR = log10(Snellen denominator ÷ 20)
Snellen 20/x denominators to MAR values
20/x → MAR
MAR = Snellen denominator ÷ 20
Snellen 20/x denominators to Snellen 6/x denominators
20/x → 6/x
6/x denominator = (20/x denominator) × 0.3
Snellen 6/x denominators to Decimal acuity values
6/x → decimal
decimal acuity = 6 ÷ Snellen denominator
Snellen 6/x denominators to LogMAR values
6/x → logMAR
logMAR = log10(Snellen denominator ÷ 6)
Snellen 6/x denominators to MAR values
6/x → MAR
MAR = Snellen denominator ÷ 6
Snellen 6/x denominators to Snellen 20/x denominators
6/x → 20/x
20/x denominator = (6/x denominator) ÷ 0.3