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
kPa to PSI converter
exact kilopascal factor, free online
POST /conv/kpa-to-psi$0.002
Developer Utilities
kW to BTU/h converter
exact International Table factor, free
POST /conv/kw-to-btu-per-hour$0.002
Developer Utilities
kWh to joules converter
exact 3.6e6 factor, free
POST /conv/kwh-to-joules$0.002
Developer Utilities
Lbs to kg converter
exact factor, free online
POST /conv/lbs-to-kg$0.002
Developer Utilities
Lbs to stone converter
exact 14 lb factor, free online
POST /conv/lbs-to-stone$0.002
Developer Utilities
Light-years to km converter
exact factor, free in browser
POST /conv/light-years-to-km$0.002
Developer Utilities
Liters to cubic feet converter
exact factor, free
POST /conv/liters-to-cubic-feet$0.002
Developer Utilities
Liters to gallons converter
exact US factor, free
POST /conv/liters-to-gallons$0.002
Developer Utilities
Mach to mph converter
exact ISA factor, free in browser
POST /conv/mach-to-mph$0.002
Developer Utilities
Mass attenuation coefficient converter
cm²/g, m²/kg, free
POST /conv/mass-attenuation$0.002
Developer Utilities
Mbps to Gbps converter
exact ÷1000 factor, free
POST /conv/mbps-to-gbps$0.002
Developer Utilities
Megabits to megabytes converter
exact ÷8 factor, free
POST /conv/megabits-to-megabytes$0.002
Developer Utilities
Megapixel resolution converter
MP, pixels, width×height, free
POST /conv/megapixels$0.002
Developer Utilities
Meters per second to km/h
exact ×3.6 factor, free in browser
POST /conv/meters-per-second-to-kmh$0.002
Developer Utilities
Meters to feet converter
exact factor, free in browser
POST /conv/meters-to-feet$0.002
Developer Utilities
Metric HP to kW converter
PS/CV to kilowatts, exact factor
POST /conv/metric-hp-to-kw$0.002
Developer Utilities
Metric tons to kg converter
exact factor, free in browser
POST /conv/metric-tons-to-kg$0.002
Developer Utilities
Color temperature mired converter
Kelvin, mired, MK⁻¹
POST /conv/mired$0.002
Developer Utilities
mmHg to atm converter
exact factor, free in browser
POST /conv/mmhg-to-atm$0.002
Developer Utilities
Molality converter
mol/kg, mmol/kg, molal and more free
POST /conv/molality$0.002
Developer Utilities
Molar enthalpy converter
J/mol, kcal/mol, BTU/lbmol, free
POST /conv/molar-enthalpy$0.002
Developer Utilities
MPG to km/L converter
exact US factor, free in browser
POST /conv/mpg-to-kml$0.002
Developer Utilities
Mph to km/h converter
exact 1.609344 factor, free in browser
POST /conv/mph-to-kmh$0.002
Developer Utilities
Mph to knots converter
exact factor, free in browser
POST /conv/mph-to-knots$0.002
Developer Utilities
Mph to meters per second
exact factor, free in browser
POST /conv/mph-to-meters-per-second$0.002
Developer Utilities
Nautical miles to miles converter
exact factor, free in browser
POST /conv/nautical-miles-to-miles$0.002
Developer Utilities
Newton-meters to foot-pounds converter
exact factor, free
POST /conv/newton-meters-to-foot-pounds$0.002
Developer Utilities
Newtons to pounds-force converter
exact factor, free
POST /conv/newtons-to-pounds-force$0.002
Developer Utilities
Number density converter
per m³, per cm³, per L, free
POST /conv/number-density$0.002
Developer Utilities
Octave band frequency converter
Hz, octaves, decades
POST /conv/octave-band$0.002
Developer Utilities
Osmolarity converter
Osm/L, mOsm/L, µOsm/L free instant
POST /conv/osmolarity$0.002
Developer Utilities
Ounces to cups converter
exact US fluid factor, free
POST /conv/ounces-to-cups$0.002
Developer Utilities
Ounces to grams converter
exact factor, free in browser
POST /conv/ounces-to-grams$0.002
Developer Utilities
Ounces to lbs converter
exact 16 oz factor, free
POST /conv/ounces-to-lbs$0.002
Developer Utilities
Particle fluence converter
per m², per cm², per barn, free
POST /conv/particle-fluence$0.002
Developer Utilities
Nominal pipe size converter
NPS, DN & OD mm free
POST /conv/pipe-size$0.002
Developer Utilities
Plato & specific gravity converter
°P, SG, Brix, free
POST /conv/plato-gravity$0.002
Developer Utilities
Pounds-force to newtons converter
exact factor, free in browser
POST /conv/pounds-force-to-newtons$0.002
Developer Utilities
Pounds to grams converter
exact factor, free in browser
POST /conv/pounds-to-grams$0.002
Developer Utilities
PSI to ATM converter
exact atmosphere factor, free
POST /conv/psi-to-atm$0.002
Developer Utilities
PSI to kPa converter
exact factor, free in browser
POST /conv/psi-to-kpa$0.002
Developer Utilities
Quarts to cups converter
exact US factor, free
POST /conv/quarts-to-cups$0.002
Developer Utilities
Radiant intensity converter
W/sr, mW/sr, W/deg², free
POST /conv/radiant-intensity$0.002
Developer Utilities
Reactive power converter
var, kvar, Mvar free
POST /conv/reactive-power$0.002
Developer Utilities
Magnetic reluctance converter
H⁻¹, At/Wb, rel, free
POST /conv/reluctance$0.002
Developer Utilities
RPM to Hz converter
revolutions per minute to hertz free
POST /conv/rpm-to-hz$0.002
Developer Utilities
Shore hardness converter
Shore A, D, OO free
POST /conv/shore-hardness$0.002
Developer Utilities
Square meters to square feet
exact factor, free in browser
POST /conv/square-meters-to-square-feet$0.002
Developer Utilities
Square miles to acres converter
exact factor, free
POST /conv/square-miles-to-acres$0.002
Developer Utilities
Surface density converter
kg/m², g/cm², oz/yd² and more, free
POST /conv/surface-density$0.002
Developer Utilities
Tablespoons to cups converter
exact US factor, free
POST /conv/tablespoons-to-cups$0.002
Developer Utilities
Teaspoons to tablespoons converter
exact 3 tsp = 1 tbsp, free
POST /conv/teaspoons-to-tablespoons$0.002
Developer Utilities
Thermal diffusivity converter
m²/s, cm²/s, ft²/h, free
POST /conv/thermal-diffusivity$0.002
Developer Utilities
Temperature gradient converter
K/m, °F/ft, °C/cm and more
POST /conv/thermal-gradient$0.002
Developer Utilities
Therms to kWh converter
exact factor, free in browser
POST /conv/therms-to-kwh$0.002
Developer Utilities
Troy ounces to grams converter
exact factor, free in browser
POST /conv/troy-ounces-to-grams$0.002
Developer Utilities
Twip converter
twips, points, pixels and inches, free
POST /conv/twip$0.002
Developer Utilities
Valve flow coefficient converter
Cv, Kv, Av, free
POST /conv/valve-flow-coefficient$0.002
Developer Utilities
Volume charge density converter
C/m³, C/L, C/cm³, free
POST /conv/volume-charge-density$0.002
Developer Utilities
VSWR return loss converter
SWR, |Γ|, RL dB and mismatch loss
POST /conv/vswr$0.002