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
Right triangle from hypotenuse and angle calculator
POST /trig/right-triangle-hypotenuse-angle$0.002Developer Utilities
Sine of an angle in radians calculator
decimal result
POST /trig/sin-radians$0.002Developer Utilities
Ladder angle against wall calculator
length and base distance
POST /trig/ladder-angle$0.002Developer Utilities
Shadow length from sun angle calculator
POST /trig/shadow-length$0.002Developer Utilities
SSA number of triangles calculator
zero, one, or two
POST /trig/ssa-number-of-solutions$0.002Developer Utilities
Cosine of a difference calculator
evaluate cos(A − B)
POST /trig/cos-difference$0.002Developer Utilities
Cosine Half-Angle Calculator
Choose the Correct Quadrant Sign
POST /trig/cos-half-angle$0.002Developer Utilities
Solve A sin(Bx) + C equation calculator
POST /trig/solve-asinbxc-equation$0.002Developer Utilities
Sum-to-product sine calculator
factor sin A + sin B
POST /trig/sum-to-product-sin$0.002Developer Utilities
Triangle area from two sides and included angle calculator
POST /trig/area-sas$0.002Developer Utilities
Radians to gradians conversion calculator
rad to gon
POST /trig/rad-to-gradian$0.002Developer Utilities
Midpoint of polar coordinates calculator
POST /trig/polar-midpoint$0.002Developer Utilities
Exponential growth model solution calculator
evaluate A(t)
POST /calculus/exponential-growth-solution$0.002Developer Utilities
Runge-Kutta 2 ODE Solver Calculator
POST /calculus/rk2-method$0.002Developer Utilities
Involute function
tan(a) minus a for a pressure angle in radians
POST /math/involute-function$0.002Developer Utilities
Irregular polygon area calculator
shoelace formula from vertices
POST /math/irregular-polygon-area$0.002Developer Utilities
Irregular trapezoid area calculator
two parallel sides and height, free
POST /math/irregular-trapezoid-area$0.002Developer Utilities
Is modulo associative?
compare (a % b) % c vs a % (b % c)
POST /math/is-modulo-associative$0.002Developer Utilities
Isosceles right triangle calculator
leg or hypotenuse from one known side
POST /math/isosceles-right-triangle$0.002Developer Utilities
Isosceles triangle angles
base angles from the vertex angle, in degrees
POST /math/isosceles-triangle-angles$0.002Developer Utilities
Isosceles triangle area calculator
from base and equal sides
POST /math/isosceles-triangle-a$0.002Developer Utilities
Isosceles triangle area calculator
area from base and equal sides, free
POST /math/isosceles-triangle-area$0.002Developer Utilities
HSL to CMYK converter
hue, saturation, lightness to print percentages
POST /color/hsl-cmyk$0.002Developer Utilities
HSL to HWB converter
hue, saturation, lightness to HWB, free
POST /color/hsl-hwb$0.002Developer Utilities
Isosceles triangle height calculator
height from base and equal side
POST /math/isosceles-triangle-height$0.002Developer Utilities
Isosceles triangle side calculator
equal sides from base and height, free
POST /math/isosceles-triangle-side$0.002Developer Utilities
Lagrange error bound calculator
max interpolation error, free
POST /math/lagrange-error-bound$0.002Developer Utilities
RGB to RGB555 packer
8-bit RGB to 15-bit color, free
POST /color/rgb-rgb555$0.002Developer Utilities
RGB to RGB565 packer
8-bit color to 16-bit TFT word, free
POST /color/rgb-rgb565$0.002Developer Utilities
Lateral area of a cone
curved surface π r l from radius and slant height
POST /math/lateral-area-of-cone$0.002Developer Utilities
Lateral area of a trapezoidal prism calculator
bases, legs, length
POST /math/lateral-area-trapezoidal-prism$0.002Developer Utilities
Extract color channel
red, green, blue or alpha as a number
POST /color/channel-extract$0.002Developer Utilities
Adjust color contrast by factor
mid-gray RGB scale, free
POST /color/contrast-adjust$0.002Developer Utilities
Vivid light blend
combine two colors (color-burn or color-dodge)
POST /color/vivid-light$0.002Developer Utilities
Lateral surface area of a cylinder
2 π r h from radius and height
POST /math/lateral-surface-area-cylinder$0.002Developer Utilities
Latus rectum calculator
parabola and ellipse focal chord length
POST /math/latus-rectum$0.002Developer Utilities
Law of cosines calculator
find a side or angle, free
POST /math/law-of-cosines$0.002Developer Utilities
Monochromatic palette generator
N lightness steps from one hue, free
POST /color/monochromatic$0.002Developer Utilities
Accessible text color suggester
meet WCAG contrast by lightness
POST /color/suggest-accessible-text$0.002Developer Utilities
Hex to CSS variable
named custom property from hex, free
POST /color/hex-to-css-var$0.002Developer Utilities
Is text legible on a background?
WCAG size-aware check
POST /color/safe-on-background$0.002Developer Utilities
Parse HSL string to RGB
CSS hsl() to red green blue, free
POST /color/hsl-string-to-rgb$0.002Developer Utilities
Paper-white tint adjust
preview a color on tinted stock
POST /color/paper-white-adjust$0.002Developer Utilities
Average color of a list
mean RGB of a palette, free
POST /color/average-color$0.002Developer Utilities
Nearest Crayola color
closest classic crayon match, free
POST /color/nearest-crayola$0.002Developer Utilities
Baking powder cups to grams converter
US cup density, free
POST /cook/baking-powder-cups-to-grams$0.002Developer Utilities
Baking soda teaspoons to grams converter
4.6 g/tsp, free
POST /cook/baking-soda-tsp-to-grams$0.002Developer Utilities
Butter sticks to cups converter
half cup per stick, free
POST /cook/butter-sticks-to-cups$0.002Developer Utilities
Shredded cheese cups to grams converter
fixed density, free
POST /cook/shredded-cheese-cups-to-grams$0.002Developer Utilities
Recipe scale by factor calculator
one ingredient × factor
POST /cook/scale-by-factor$0.002Developer Utilities
Batch recipe multiplier calculator
scale comma-separated ingredient list
POST /cook/scale-ingredient-list$0.002Developer Utilities
Pancake batter ratio calculator
flour, milk and egg from pancake count
POST /cook/pancake-ratio$0.002Developer Utilities
Simple syrup ratio calculator
sugar & water weights by ratio
POST /cook/simple-syrup-ratio$0.002Developer Utilities
Length and width of a rectangle from perimeter and side ratio
POST /math/length-and-width-of-rectangle-given-perimeter$0.002Developer Utilities
Pork roast time by weight
minutes per pound calculator
POST /cook/roast-pork-time$0.002Developer Utilities
Sous-vide water bath volume calculator
liters from tub minus food
POST /cook/sousvide-water-volume$0.002Developer Utilities
Coffee beans from water volume calculator
brew ratio to grams
POST /cook/coffee-beans-from-water$0.002Developer Utilities
Oatmeal oats-to-liquid ratio calculator
liquid from oat type
POST /cook/oatmeal-ratio$0.002Developer Utilities
Beer SRM color estimator
Morey SRM from MCU and volume
POST /cook/beer-srm-color$0.002Developer Utilities
Dessert quantity per person calculator
servings from guest count
POST /cook/dessert-per-person$0.002