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
Cartesian to polar converter
radius and angle in radians from x and y
POST /math/cartesian-to-polar$0.002Developer Utilities
Catenary curve height calculator
free
POST /math/catenary-curve$0.002Developer Utilities
Excavation volume calculator
cut or fill soil in yd³ free
POST /home/excavation-volume$0.002Developer Utilities
Calculate meal prep containers needed
free planner
POST /home/meal-prep-container-count$0.002Developer Utilities
Square footage calculator
room area in sq ft from length × width
POST /home/square-footage$0.002Developer Utilities
Tile project cost estimator
tiles, thinset, grout and waste allowance
POST /home/tile-project-cost$0.002Developer Utilities
Triangle area calculator
base and height for lots and gables
POST /home/triangle-area-land$0.002Developer Utilities
Conference room capacity calculator by seating layout
POST /life/conference-room-capacity-check$0.002Developer Utilities
Event catering food quantity estimator
appetizers, buffet or plated
POST /life/event-catering-quantity-estimate$0.002Developer Utilities
Wedding budget breakdown by category calculator
POST /life/wedding-budget-category-split$0.002Developer Utilities
Ceiling function calculator
smallest integer >= x, free
POST /math/ceiling-function$0.002Developer Utilities
Center of an ellipse
find (h, k) from the general conic equation
POST /math/center-of-ellipse$0.002Developer Utilities
Center of mass calculator
balance point of point masses
POST /math/center-of-mass$0.002Developer Utilities
Central angle calculator
degrees from arc length and radius
POST /math/central-angle$0.002Developer Utilities
Centroid calculator
average of a set of points
POST /math/centroid$0.002Developer Utilities
Round-trip average speed
harmonic mean of two equal legs
POST /mech/average-speed-round-trip$0.002Developer Utilities
Braking distance calculator
stopping distance from speed and deceleration
POST /mech/stopping-distance$0.002Developer Utilities
Vertical throw max height calculator
H = v² / (2g), free
POST /mech/vertical-throw-max-height$0.002Developer Utilities
Estimate Parking Spaces Needed for a Building
POST /travel/parking-lot-space-count-estimate$0.002Developer Utilities
Compare Book Cost per Page
Find the Better Value
POST /date/book-cost-per-page-compare$0.002Developer Utilities
Laundry Cost per Load Calculator for Water and Electricity
POST /home/laundry-load-cost-estimate$0.002Developer Utilities
Gym membership cost per visit calculator
divide monthly fee by visits
POST /life/gym-membership-cost-per-visit$0.002Developer Utilities
Crosswind heading calculator
correction angle and ground speed
POST /mech/crosswind-correction$0.002Developer Utilities
Thrown downward motion calculator
displacement and final velocity
POST /mech/thrown-downward$0.002Developer Utilities
Hot desk utilization rate calculator
POST /home/desk-booking-utilization-rate$0.002Developer Utilities
Order a Book Series by Publication or Chronological Order
POST /life/book-series-reading-order$0.002Developer Utilities
Centroid of a triangle
the average of its three vertices
POST /math/centroid-of-a-triangle$0.002Developer Utilities
Change of base calculator
log in any base from value and base
POST /math/change-of-base$0.002Developer Utilities
Characteristic polynomial calculator
matrix coefficients, free
POST /math/characteristic-polynomial$0.002Developer Utilities
Average velocity from displacement calculator
signed Δx/Δt free
POST /mech/average-velocity-displacement$0.002Developer Utilities
Two-phase accelerate-cruise calculator
distance and time from rest
POST /mech/two-stage-motion$0.002Developer Utilities
Velocity-time graph area calculator
displacement from u, v, and t
POST /mech/vt-graph-displacement$0.002Developer Utilities
Annual commute time calculator
total hours per year
POST /travel/commute-time-annual-total$0.002Developer Utilities
Check similarity in right triangles
proportional sides test via API
POST /math/check-similarity-in-right-triangles$0.002Developer Utilities
Chinese remainder calculator
solve simultaneous congruences
POST /math/chinese-remainder$0.002Developer Utilities
Friction stopping distance calculator
d = v²/(2μg) from speed and μ
POST /mech/friction-stopping-distance$0.002Developer Utilities
Projectile clears wall calculator
speed, angle, height
POST /mech/projectile-clears-wall$0.002Developer Utilities
Optimal launch angle calculator
max range on level ground
POST /mech/projectile-max-range-angle$0.002Developer Utilities
Projectile velocity at time
speed and direction with gravity
POST /mech/projectile-velocity-at-time$0.002Developer Utilities
Postage stamp calculator
find how many stamps you need
POST /date/postage-stamp-count$0.002Developer Utilities
Calculate shipping dimensional weight and billable weight
POST /ecom/shipping-dimensional-weight$0.002Developer Utilities
Cholesky decomposition calculator
lower triangular factor L, free
POST /math/cholesky-decomposition$0.002Developer Utilities
Circle center from three points
center coordinates and radius
POST /math/circle-center$0.002Developer Utilities
Circle diameter calculator
from radius, circumference or area
POST /math/circle-diameter$0.002Developer Utilities
Atwood machine tension calculator
cord tension T = 2 m1 m2 g / (m1+m2)
POST /mech/atwood-tension$0.002Developer Utilities
Frictionless incline acceleration calculator
a = g sin θ free
POST /mech/incline-acceleration-frictionless$0.002Developer Utilities
Circle length calculator
circumference from radius or diameter
POST /math/circle-length$0.002Developer Utilities
Elevator apparent weight calculator
N = m(g+a), free
POST /mech/elevator-apparent-weight$0.002Developer Utilities
Blocks in contact force calculator
acceleration & contact force
POST /mech/two-block-contact-force$0.002Developer Utilities
Circle formula
standard and general equation from center and radius
POST /math/circle-formula$0.002Developer Utilities
Circle measurements
area, circumference and diameter from radius
POST /math/circle-measurements$0.002Developer Utilities
Equilibrant force calculator
balance coplanar force components
POST /mech/equilibrant-force$0.002Developer Utilities
Action-reaction force calculator
Newton's third law pair
POST /mech/newton-third-law-pair$0.002Developer Utilities
Wedge mechanical advantage calculator
ideal IMA = length ÷ thickness
POST /mech/wedge-mechanical-advantage$0.002Developer Utilities
Seeded random number generator in a range
integer or float
POST /prob/random-number-range$0.002Developer Utilities
Seeded random string generator
create repeatable text
POST /prob/random-string-seeded$0.002Developer Utilities
Seeded coin flip simulator
reproducible heads and tails
POST /game/coin-flip-seeded$0.002Developer Utilities
Seeded dice roller
reproducible dice results
POST /game/dice-roll-seeded$0.002Developer Utilities
Pick a random name from a list with a reproducible seed
POST /game/name-picker-seeded$0.002Developer Utilities
Circle perimeter calculator
from the radius, free online
POST /math/circle-perimeter$0.002