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
Bolt group eccentric shear calculator
elastic vector critical fastener
POST /eng/bolt-group-eccentric$0.002Developer Utilities
Overhead conductor tension calculator
H = wL²/(8d)
POST /eng/cable-tension$0.002Developer Utilities
Conductor Resistance Calculator
Length, Area, and Resistivity
POST /eng/conductor-resistance$0.002Developer Utilities
Pipe continuity velocity calculator
find outlet velocity
POST /eng/continuity-velocity$0.002Developer Utilities
Convective Heat Transfer Calculator
Newton's Law of Cooling
POST /eng/convection-newton$0.002Developer Utilities
Crank mechanism torque calculator
piston force, angle and radius
POST /eng/crank-torque$0.002Developer Utilities
Critical Crack Length Calculator
Fracture Toughness
POST /eng/critical-crack$0.002Developer Utilities
Electrical demand load calculator
connected load and demand factor
POST /eng/demand-load$0.002Developer Utilities
Direct Shear Stress Calculator for Pins, Bolts, and Rivets
POST /eng/direct-shear-stress$0.002Developer Utilities
Duct air velocity calculator
airflow rate divided by area
POST /eng/duct-velocity$0.002Developer Utilities
Engineering Stress from Load Calculator
Tensile Test σ = F/A₀
POST /eng/engineering-stress$0.002Developer Utilities
Straight fin efficiency calculator
η = tanh(mL)/(mL) rectangular fin
POST /eng/fin-efficiency$0.002Developer Utilities
Fixed-fixed beam center load calculator
moments and deflection
POST /eng/fixed-beam-center-load$0.002Developer Utilities
Flow regime from Reynolds number calculator
POST /eng/flow-regime$0.002Developer Utilities
Hydrostatic Force on an Inclined Surface Calculator
POST /eng/force-inclined-surface$0.002Developer Utilities
Fourier Number Calculator
Transient Heat Conduction Fo
POST /eng/fourier-number$0.002Developer Utilities
Swamee-Jain friction factor calculator for turbulent pipe flow
POST /eng/friction-swamee$0.002Developer Utilities
Gear output speed calculator
shaft RPM from input speed and ratio
POST /eng/gear-output-speed$0.002Developer Utilities
Gear pitch diameter calculator
module and tooth count
POST /eng/gear-pitch-diameter$0.002Developer Utilities
Pipe pressure drop from head loss calculator
ΔP = ρgh
POST /eng/head-loss-pressure$0.002Developer Utilities
Horizontal Curve Calculator
Tangent, Length and External Distance
POST /eng/horizontal-curve-elements$0.002Developer Utilities
Height of instrument calculator
HI from benchmark and backsight
POST /eng/level-hi$0.002Developer Utilities
Map scale from measurement calculator
RF 1:N from map & ground distance
POST /eng/map-scale-from-measure$0.002Developer Utilities
Modulus of toughness estimate
strength and fracture strain
POST /eng/modulus-of-toughness$0.002Developer Utilities
Nozzle exit velocity calculator
Torricelli √(2gh) from head
POST /eng/nozzle-velocity$0.002Developer Utilities
Heat exchanger NTU effectiveness calculator
POST /eng/ntu-effectiveness$0.002Developer Utilities
Percent Elongation Calculator for Tensile Specimens
POST /eng/percent-elongation$0.002Developer Utilities
Pipe flow velocity calculator
average speed from Q and diameter
POST /eng/pipe-velocity$0.002Developer Utilities
Plastic Moment Capacity Calculator
POST /eng/plastic-moment$0.002Developer Utilities
Solid Shaft Polar Moment of Inertia Calculator
POST /eng/polar-moi-circle$0.002Developer Utilities
Pump Total Dynamic Head Calculator
Static, Friction and Velocity Head
POST /eng/pump-tdh$0.002Developer Utilities
Thermal resistance series calculator
layered wall total R-value
POST /eng/resistance-series$0.002Developer Utilities
Screw jack MA calculator
ideal advantage from lever arm and pitch
POST /eng/screw-jack-ma$0.002Developer Utilities
Shaft critical speed calculator from static deflection
POST /eng/shaft-critical-speed$0.002Developer Utilities
Slider-Crank Piston Position Calculator
POST /eng/slider-crank-position$0.002Developer Utilities
Soderberg fatigue criterion calculator
safety factor and line check
POST /eng/soderberg-fatigue$0.002Developer Utilities
Steel plate weight calculator
mass from L, W, thickness, density
POST /eng/steel-plate-weight$0.002Developer Utilities
Motor Synchronous Speed Calculator
Frequency and Poles
POST /eng/synchronous-speed$0.002Developer Utilities
Thermal strain calculator
free strain from α and temperature change
POST /eng/thermal-strain$0.002Developer Utilities
Torque from power and speed calculator
shaft torque in N·m
POST /eng/torque-from-power$0.002Developer Utilities
Shaft Torsional Shear Stress Calculator
POST /eng/torsion-shear-stress$0.002Developer Utilities
Transformer turns ratio and voltage calculator
POST /eng/transformer-turns$0.002Developer Utilities
Trapezoidal channel hydraulic radius
area, wetted perimeter
POST /eng/trap-channel-geo$0.002Developer Utilities
Trigonometric leveling calculator
elevation from angle and distance
POST /eng/trig-leveling$0.002Developer Utilities
Truss joint two-member force calculator
axial forces from ΣFx and ΣFy
POST /eng/truss-joint-2d$0.002Developer Utilities
Hydraulic turbine power calculator
P = ρ g Q H η from flow and head
POST /eng/turbine-power$0.002Developer Utilities
Feeder voltage drop percentage calculator
voltage drop to percent
POST /eng/vdrop-percent-feeder$0.002Developer Utilities
Vertical curve elevation calculator
parabolic road profile
POST /eng/vertical-curve-elevation$0.002Developer Utilities
Feeder voltage regulation calculator
%VR (no-load, full-load)
POST /eng/voltage-regulation$0.002Developer Utilities
Interior Wall Surface Temperature Calculator
Check Condensation Risk
POST /eng/wall-surface-temp$0.002Developer Utilities
V-notch weir flow calculator
triangular weir discharge
POST /eng/weir-vnotch$0.002Developer Utilities
Wheel and axle mechanical advantage calculator
POST /eng/wheel-axle-ma$0.002Developer Utilities
Reverse percentage calculator
find the original amount
POST /fin/reverse-percentage$0.002Developer Utilities
Running age-grade calculator
compare race performance by age
POST /health/age-grade-running$0.002Developer Utilities
Female Widmark BAC calculator
estimate blood alcohol concentration
POST /health/bac-widmark-female$0.002Developer Utilities
Calories per serving calculator
POST /health/calories-per-serving$0.002Developer Utilities
Carb cycling planner
high medium low carb days from weekly budget
POST /health/carb-cycling$0.002Developer Utilities
Critical power two-point calculator
CP and W′ from two maximal efforts
POST /health/critical-power-2point$0.002Developer Utilities
DOTS score calculator for powerlifting totals
POST /health/dots-score$0.002Developer Utilities
Fractional excretion of sodium calculator
FENa percentage
POST /health/fena$0.002