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
Wavelength calculator
speed divided by frequency, free
POST /phys/wavelength$0.002Developer Utilities
Durbin-Watson statistic calculator
first-order residual autocorrelation
POST /stat/durbin-watson$0.002Developer Utilities
Tukey HSD post-hoc
pairwise comparisons after ANOVA, free
POST /stat/tukey-hsd$0.002Developer Utilities
Reverse line order
flip text lines top to bottom, free
POST /str/reverse-lines$0.002Developer Utilities
Charles's law calculator
find V2 or T2 at constant pressure
POST /thermo/charles-law$0.002Developer Utilities
EV trip charging cost
distance, efficiency, and electricity price
POST /travel/ev-trip-cost$0.002Developer Utilities
Half-angle calculator
sin, cos, tan of half the angle with correct signs
POST /trig/half-angle$0.002Developer Utilities
Rectangular to polar converter
r and theta in the correct quadrant
POST /trig/rectangular-to-polar$0.002Developer Utilities
Midline of a sinusoidal function
find y = D from the vertical shift
POST /trig/sinusoid-midline$0.002Developer Utilities
EMC field strength converter
V/m, dBµV/m, A/m, free
POST /conv/emc-field-strength$0.002Developer Utilities
First-order reaction time calculator
t = ln([A]₀/[A])/k, free
POST /chem/first-order-time$0.002Developer Utilities
Absorbed dose converter
Gy, mGy, rad and erg/g, free
POST /conv/absorbed-dose$0.002Developer Utilities
Acceleration converter
m/s², ft/s², g and gal, free
POST /conv/acceleration$0.002Developer Utilities
Mole unit converter
mol, mmol, µmol, kmol and lb-mol, free
POST /conv/amount-of-substance$0.002Developer Utilities
Angle converter
degrees, radians, gradians, turns, free
POST /conv/angle$0.002Developer Utilities
Angular acceleration converter
rad/s², deg/s² and rev/min², free
POST /conv/angular-acceleration$0.002Developer Utilities
Angular velocity converter
rad/s, deg/s, RPM, RPS free
POST /conv/angular-velocity$0.002Developer Utilities
Area converter
m², ft², acres, hectares, mi², km² free
POST /conv/area$0.002Developer Utilities
Astronomical distance converter
AU, ly, pc, km, mi, free
POST /conv/astronomical-distance$0.002Developer Utilities
Blood glucose converter
mg/dL ↔ mmol/L free
POST /conv/blood-glucose$0.002Developer Utilities
Bra size converter
US, UK, EU, French & Australian sizes, free
POST /conv/bra-size$0.002Developer Utilities
Capacitance converter
farads, millifarads, microfarads, picofarads, free
POST /conv/capacitance$0.002Developer Utilities
Catalytic activity converter
katal, µkat, nkat and enzyme units (U), free
POST /conv/catalytic-activity$0.002Developer Utilities
Cholesterol unit converter
mg/dL ↔ mmol/L for total, HDL and LDL, free
POST /conv/cholesterol$0.002Developer Utilities
Clothing size converter
US, UK, EU and S/M/L, free
POST /conv/clothing-size$0.002Developer Utilities
Molar concentration converter
mol/L, mmol/L, µmol/L, mol/m³ free
POST /conv/concentration$0.002Developer Utilities
Conductance converter
siemens, millisiemens, microsiemens, free
POST /conv/conductance$0.002Developer Utilities
Data transfer rate converter
bps, Mbps, MB/s, free
POST /conv/data-rate$0.002Developer Utilities
Digital storage converter
bytes, KB, MB, GB, TB, KiB, MiB free
POST /conv/data-size$0.002Developer Utilities
Density converter
kg/m³, g/cm³, lb/ft³ and lb/gal, free
POST /conv/density$0.002Developer Utilities
Dynamic viscosity converter
Pa·s, poise, cP, lbf·s/ft² free
POST /conv/dynamic-viscosity$0.002Developer Utilities
Electric charge converter
C, mC, µC, Ah, mAh, e free
POST /conv/electric-charge$0.002Developer Utilities
Electric current converter
A, mA, µA, kA, abA, free
POST /conv/electric-current$0.002Developer Utilities
Electric field strength converter
V/m, V/cm, kV/m, V/mil, free
POST /conv/electric-field$0.002Developer Utilities
Energy converter
joules, calories, kWh, BTU, eV, free
POST /conv/energy$0.002Developer Utilities
Fahrenheit to Celsius converter
exact (F−32)×5/9, free
POST /conv/fahrenheit-to-celsius$0.002Developer Utilities
Volume flow rate converter
L/s, m³/h, GPM, CFM, free
POST /conv/flow-rate$0.002Developer Utilities
Force converter
newtons, kN, dynes, lbf, kgf, poundals, free
POST /conv/force$0.002Developer Utilities
Frequency converter
Hz, kHz, MHz, GHz, RPM, rad/s free
POST /conv/frequency$0.002Developer Utilities
Frequency wavelength converter
f ↔ λ with c or custom speed, free
POST /conv/frequency-wavelength$0.002Developer Utilities
Fuel economy converter
MPG US, MPG imperial, km/L and L/100km, free
POST /conv/fuel-economy$0.002Developer Utilities
Fuel price unit converter
US gal, imperial gal, liter, free
POST /conv/fuel-price$0.002Developer Utilities
Grain weight converter
grains, grams, milligrams, ounces, free
POST /conv/grain-weight$0.002Developer Utilities
Hat size converter
US fitted, UK, EU cm, head circumference, free
POST /conv/hat-size$0.002Developer Utilities
Heat flux density converter
W/m², W/cm², BTU/(h·ft²), cal/(s·cm²), free
POST /conv/heat-flux$0.002Developer Utilities
Heat transfer coefficient converter
W/(m²·K), BTU/(h·ft²·°F), free
POST /conv/heat-transfer-coefficient$0.002Developer Utilities
Illuminance converter
lux, foot-candles, phot, lm/m² free
POST /conv/illuminance$0.002Developer Utilities
Inductance converter
H, mH, µH, nH, pH, free
POST /conv/inductance$0.002Developer Utilities
Gold karat converter
karats, fineness, purity %, free
POST /conv/karat-gold$0.002Developer Utilities
Kinematic viscosity converter
m²/s, stokes, centistokes and ft²/s, free
POST /conv/kinematic-viscosity$0.002Developer Utilities
Luminance converter
nit, stilb, lambert, foot-lambert and apostilb, free
POST /conv/luminance$0.002Developer Utilities
Luminous flux converter
lm, mlm, µlm, klm, Mlm, free
POST /conv/luminous-flux$0.002Developer Utilities
Luminous intensity converter
cd, mcd, kcd, candlepower, free
POST /conv/luminous-intensity$0.002Developer Utilities
Magnetic flux converter
weber, milliweber, microweber, maxwell, free
POST /conv/magnetic-flux$0.002Developer Utilities
Magnetic flux density converter
tesla, millitesla, gauss, Wb/m², free
POST /conv/magnetic-flux-density$0.002Developer Utilities
Mass converter
kg, g, lb, oz, stone, tonne and mg, free
POST /conv/mass$0.002Developer Utilities
Mass flow rate converter
kg/s, g/s, lb/h, t/h, free
POST /conv/mass-flow-rate$0.002Developer Utilities
Molar mass converter
g/mol, kg/mol, kg/kmol, free
POST /conv/molar-mass$0.002Developer Utilities
Momentum converter
kg·m/s, g·cm/s, lb·ft/s free
POST /conv/momentum$0.002Developer Utilities
Running pace converter
min/km, min/mile, km/h and mph, free
POST /conv/pace$0.002