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
Frustum cone area
total surface from two radii and slant height
POST /math/frustum-cone-area$0.002Developer Utilities
Conductor ampacity derating calculator
bundled wire adjustment
POST /home/ampacity-derate$0.002Developer Utilities
Thermal Expansion Tank Calculator for Water Heaters
POST /home/expansion-tank-sizing$0.002Developer Utilities
Generator sizing calculator
wattage from running and starting loads
POST /home/generator-sizing$0.002Developer Utilities
Outlet spacing calculator
receptacles needed by wall length
POST /home/outlet-spacing$0.002Developer Utilities
Pipe water velocity calculator
speed from flow rate and diameter
POST /home/pipe-velocity$0.002Developer Utilities
Pipe water volume calculator
liters and gallons from diameter
POST /home/pipe-water-volume$0.002Developer Utilities
Water pressure head calculator
convert PSI and feet
POST /home/water-pressure-head$0.002Developer Utilities
Fundamental counting principle calculator
multiply choices across stages
POST /math/fundamental-counting-principle$0.002Developer Utilities
Galileo's paradox of infinity
pairing counting numbers with their squares
POST /math/galileos-paradox-of-infinity$0.002Developer Utilities
Gamma function calculator
Lanczos approximation of Γ(x) for real numbers
POST /math/gamma-function$0.002Developer Utilities
Fertilizer NPK Calculator
Pounds Needed for a Nitrogen Target
POST /home/fertilizer-npk$0.002Developer Utilities
Landscape gravel calculator
cubic yards and tons from bed area and depth
POST /home/landscape-gravel$0.002Developer Utilities
Sod roll calculator
rolls and pallets from lawn area and waste
POST /home/sod-rolls$0.002Developer Utilities
Gauss-Jordan elimination calculator
solve linear systems with RREF, free
POST /math/gauss-jordan-elimination$0.002Developer Utilities
Bark mulch calculator
cubic yards and bags for garden beds
POST /home/bark-mulch$0.002Developer Utilities
Fence rail calculator
horizontal rails by section
POST /home/fence-rails$0.002Developer Utilities
Patio paver count calculator
pieces from area, size and waste
POST /home/patio-paver-count$0.002Developer Utilities
Plant spacing calculator
plants per bed from area and spacing
POST /home/plant-spacing$0.002Developer Utilities
GCD calculator
greatest common divisor via the Euclidean algorithm
POST /math/gcd$0.002Developer Utilities
Deck cost estimator
decking, framing, fasteners and footing total, free
POST /home/deck-cost$0.002Developer Utilities
Drywall cost estimator
price sheets, compound, screws and tape
POST /home/drywall-cost$0.002Developer Utilities
Renovation budget calculator
itemized costs and contingency
POST /home/renovation-budget$0.002Developer Utilities
GCF calculator
greatest common factor of two integers
POST /math/gcf$0.002Developer Utilities
Acceleration from distance and time calculator
a = 2s/t²
POST /mech/acceleration-from-distance$0.002Developer Utilities
Initial velocity for distance calculator
solve u from s, a, and t
POST /mech/initial-velocity-required$0.002Developer Utilities
Reaction distance calculator
d = v × t from speed and reaction time
POST /mech/reaction-distance$0.002Developer Utilities
Relative velocity 2D calculator
magnitude and direction of v1−v2
POST /mech/relative-velocity-2d$0.002Developer Utilities
Torricelli equation calculator
v² = u² + 2as final speed
POST /mech/torricelli-equation$0.002Developer Utilities
Vertical throw flight time calculator
calculate 2v/g
POST /mech/vertical-throw-flight-time$0.002Developer Utilities
General form equation of a circle
from center and radius
POST /math/general-form-equation-circle$0.002Developer Utilities
General to standard form of a circle
center and radius from coefficients
POST /math/general-to-standard-form-circle$0.002Developer Utilities
Rectangle calculator
area and perimeter from length and width
POST /math/generic-rectangle$0.002Developer Utilities
Angle of repose calculator
θ = arctan(μₛ) from static friction
POST /mech/angle-of-repose$0.002Developer Utilities
Force resolution calculator
horizontal and vertical components
POST /mech/force-components$0.002Developer Utilities
Incline friction to prevent sliding calculator
POST /mech/incline-friction-needed$0.002Developer Utilities
Mean velocity under uniform acceleration
(vi + vf) / 2 free
POST /mech/mean-velocity-uniform-acceleration$0.002Developer Utilities
Projectile range on an incline calculator
uphill or downhill
POST /mech/projectile-on-incline-range$0.002Developer Utilities
Complementary angle range calculator
equal range from two launch angles
POST /mech/projectile-range-two-angles$0.002Developer Utilities
Tension in accelerating cord calculator
two masses, force F
POST /mech/tension-accelerating-rope$0.002Developer Utilities
Two-rope tension calculator
solve tension from weight and angles
POST /mech/tension-two-ropes-angle$0.002Developer Utilities
Golden ratio calculator
split a segment into its golden-ratio parts
POST /math/golden-ratio$0.002Developer Utilities
Gradient calculator
slope of the line through two points
POST /math/gradient$0.002Developer Utilities
Centrifuge g-force calculator
convert rotor radius and RPM to RCF
POST /mech/centrifuge-g-force$0.002Developer Utilities
Kinetic energy ratio calculator
compare energy at two speeds
POST /mech/kinetic-energy-ratio$0.002Developer Utilities
Max speed on flat curve calculator
v = √(μ g r) from friction and radius
POST /mech/max-speed-flat-curve$0.002Developer Utilities
Output power from efficiency calculator
watts from input power
POST /mech/output-power-efficiency$0.002Developer Utilities
Pendulum speed at the bottom calculator
POST /mech/pendulum-speed-bottom$0.002Developer Utilities
Screw jack mechanical advantage calculator
MA from lever arm and pitch
POST /mech/screw-mechanical-advantage$0.002Developer Utilities
Maximum static friction calculator
find the force before sliding
POST /mech/static-friction-max$0.002Developer Utilities
Work-energy theorem calculator
net work from ΔKE free
POST /mech/work-energy-theorem$0.002Developer Utilities
Gram-Schmidt calculator
orthonormal basis from independent vectors
POST /math/gram-schmidt$0.002Developer Utilities
Graph linear inequalities on a number line
interval and shading
POST /math/graphing-inequalities-1d$0.002Developer Utilities
Angular displacement calculator
θ = ω₀t + ½αt², free
POST /mech/angular-displacement$0.002Developer Utilities
1D momentum conservation calculator
solve final velocity
POST /mech/conservation-momentum-1d$0.002Developer Utilities
Explosion fragment velocity calculator
find the second fragment speed
POST /mech/explosion-two-fragments$0.002Developer Utilities
Impulse on bouncing ball calculator
floor impulse from mass and speeds
POST /mech/impulse-bouncing-ball$0.002Developer Utilities
Point Mass Moment of Inertia Calculator
I = mr²
POST /mech/moment-of-inertia-point-mass$0.002Developer Utilities
Ring moment of inertia calculator
I = m r² for a thin hoop, free
POST /mech/moment-of-inertia-ring$0.002Developer Utilities
Newton's cradle calculator
outgoing balls and speed
POST /mech/newtons-cradle$0.002