Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Uniform distribution calculator
P, mean and variance from bounds
POST /stat/uniform-distribution$0.002Developer Utilities
Upper and lower fence calculator
Tukey outlier fences
POST /stat/upper-lower-fence$0.002Developer Utilities
Wilcoxon rank-sum test calculator
statistic and p-value free
POST /stat/wilcoxon-rank-sum-test$0.002Developer Utilities
Z-test calculator
z-statistic and p-value from mean, σ and n
POST /stat/z-test$0.002Developer Utilities
Allele frequency calculator
p and q from genotype counts
POST /bio/allele-frequency$0.002Developer Utilities
Bacteria growth calculator
final cell count from doubling time
POST /bio/bacteria-growth$0.002Developer Utilities
Bulb spacing calculator
bulbs per row and column from bed size
POST /bio/bulb-spacing$0.002Developer Utilities
Cat calorie calculator
daily kcal from weight, age, activity
POST /bio/cat-calorie$0.002Developer Utilities
Cat calorie calculator
daily kcal from weight, age and activity
POST /bio/catculator$0.002Developer Utilities
Cell doubling time calculator
Td in hours from cell counts
POST /bio/cell-doubling-time$0.002Developer Utilities
Cephalexin for dogs dosage
mg and tablets from weight
POST /bio/cephalexin-for-dogs-dosage$0.002Developer Utilities
Cricket chirp thermometer
air temperature from chirps per minute
POST /bio/cricket-chirp-thermometer$0.002Developer Utilities
DNA concentration calculator
A260 absorbance to ng/µL
POST /bio/dna-concentration$0.002Developer Utilities
Dog BMI calculator
body condition index from weight and girth
POST /bio/dog-bmi$0.002Developer Utilities
Dog food calculator
daily cups and grams from weight
POST /bio/dog-food$0.002Developer Utilities
Dog Metacam calculator
meloxicam dose in mg from weight
POST /bio/dog-metacam$0.002Developer Utilities
Dog pregnancy calculator
whelping date from mating
POST /bio/dog-pregnancy$0.002Developer Utilities
Dog water intake calculator
daily mL from weight and activity
POST /bio/dog-water-intake$0.002Developer Utilities
Feed conversion ratio calculator
FCR from feed and gain
POST /bio/fcr$0.002Developer Utilities
Grain bin calculator
cubic feet and bushels from diameter
POST /bio/grain-bin$0.002Developer Utilities
Hamster age calculator
convert months to human years
POST /bio/hamster-age$0.002Developer Utilities
Horse weight calculator
estimate from girth and length
POST /bio/horse-weight$0.002Developer Utilities
Mutation frequency calculator
mutants per cell plated
POST /bio/mutation-frequency$0.002Developer Utilities
Pet sitter rates calculator
daily rate, extra pet fee, total
POST /bio/pet-sitter-rates$0.002Developer Utilities
Pine straw calculator
bales from square footage and coverage
POST /bio/pine-straw$0.002Developer Utilities
Plants calculator
how many plants fit from area and spacing
POST /bio/plants$0.002Developer Utilities
Potting soil calculator
liters and cubic feet from pot shape
POST /bio/potting-soil-calculator$0.002Developer Utilities
Punnett square calculator
monohybrid genotype and phenotype ratios
POST /bio/punnett-square$0.002Developer Utilities
Rabbit cage size calculator
floor area from count and class
POST /bio/rabbit-cage-size$0.002Developer Utilities
Rabbit coat color calculator
offspring color probabilities
POST /bio/rabbit-color$0.002Developer Utilities
Rat cage calculator
minimum volume and suggested footprint
POST /bio/rat-cage$0.002Developer Utilities
Raw dog food calculator
daily grams from weight and percent
POST /bio/raw-dog-food$0.002Developer Utilities
Sheep gestation calculator
lambing date from breeding
POST /bio/sheep-gestation$0.002Developer Utilities
Soil calculator
raised bed fill volume from length, width, depth
POST /bio/soil$0.002Developer Utilities
Swine gestation calculator
sow farrowing date from breeding
POST /bio/swine-gestation$0.002Developer Utilities
Tramadol for dogs
milligram dose from weight and mg/kg
POST /bio/tramadol-for-dogs$0.002Developer Utilities
Tree age calculator
estimate years from DBH and growth factor
POST /bio/tree-age$0.002Developer Utilities
Tree height calculator
distance and elevation angle to height, free
POST /bio/tree-height$0.002Developer Utilities
Tree leaves calculator
estimate leaf count from crown volume
POST /bio/tree-leaves$0.002Developer Utilities
Trihybrid Punnett square
three-gene offspring genotype frequencies
POST /bio/trihybrid-cross-punnett-square$0.002Developer Utilities
Turtle tank size calculator
10 gallons per inch of shell, free
POST /bio/turtle-tank$0.002Developer Utilities
Water potential calculator
Ψ = −iCRT + Ψp in bars
POST /bio/water-potential$0.002Developer Utilities
Water-soluble fertilizer calculator
grams from ppm and volume
POST /bio/water-soluble-fertilizer$0.002Developer Utilities
Benzo[a]pyrene exposure
inhaled dose from air over years
POST /eco/benzoapyrene$0.002Developer Utilities
Car vs bike CO2
driving vs cycling trip emissions
POST /eco/car-vs-bike$0.002Developer Utilities
Cigarette butts calculator
annual litter count and discarded mass
POST /eco/cigarette-butts$0.002Developer Utilities
CO2 breathing emission calculator
exhaled kg from people and hours
POST /eco/co2-breathing-emission$0.002Developer Utilities
Cryptocurrency footprint calculator
kWh and CO2e per transaction
POST /eco/cryptocurrency-footprint$0.002Developer Utilities
Drip faucet calculator
liters wasted from drips, volume and days
POST /eco/drip-faucet$0.002Developer Utilities
Fish mercury calculator
weekly µg from species and servings
POST /eco/fish-mercury$0.002Developer Utilities
Flight CO2 emissions calculator
kg from km, factor and passengers
POST /eco/flight-emissions$0.002Developer Utilities
Hand dryers vs paper towels
annual carbon footprint
POST /eco/hand-dryers-vs-paper-towels$0.002Developer Utilities
Hydroelectric power calculator
watts from flow, head and efficiency
POST /eco/hydroelectric-power$0.002Developer Utilities
Lotka-Volterra equations
predator-prey population time series
POST /eco/lotka-volterra-equations$0.002Developer Utilities
Olympic Games carbon footprint
travel, energy and construction
POST /eco/olympic-games-sustainability$0.002Developer Utilities
PHEV economy calculator
plug-in hybrid MPGe for a trip
POST /eco/phev-economy$0.002Developer Utilities
Plastic footprint calculator
annual kg from bottles, bags, packaging
POST /eco/plastic-footprint$0.002Developer Utilities
Shannon diversity index calculator
H′ from species counts
POST /eco/shannon-index$0.002Developer Utilities
Solar panel calculator
daily and yearly kWh from wattage
POST /eco/solar-panel$0.002Developer Utilities
Solar panel wattage calculator
daily and annual kWh from panels
POST /eco/solar-panel-wattage$0.002