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
Rectangular prism volume
V = l × w × h in cubic units, free
POST /math/rectangular-prism-volume$0.002Developer Utilities
Rectangular to polar
radius and angle in degrees
POST /math/rectangular-to-polar$0.002Developer Utilities
Regular polygon perimeter
P = n × side, n ≥ 3
POST /math/regular-polygon-perimeter$0.002Developer Utilities
Relatively prime checker
test if two integers have gcd 1
POST /math/relatively-prime$0.002Developer Utilities
Right circular cone
volume surface and slant
POST /math/right-circular-cone$0.002Developer Utilities
Right rectangular pyramid
volume and surface from L, W, H
POST /math/right-rectangular-pyramid$0.002Developer Utilities
Right trapezoid area calculator
two bases and height, free
POST /math/right-trapezoid-area$0.002Developer Utilities
Right triangle trigonometry
all remaining sides and angles
POST /math/right-triangle-trigonometry$0.002Developer Utilities
Rise over run calculator
slope as a fraction and a decimal
POST /math/rise-over-run$0.002Developer Utilities
Round to the nearest hundred
free calculator
POST /math/round-to-the-nearest-hundred$0.002Developer Utilities
Round to the nearest penny
half-up cents, free
POST /math/round-to-the-nearest-penny$0.002Developer Utilities
Round to the nearest ten
free calculator
POST /math/round-to-the-nearest-ten$0.002Developer Utilities
Rounding calculator
half-up to N decimal places, free
POST /math/rounding$0.002Developer Utilities
Round to the nearest thousandth
three decimals, free
POST /math/round-to-the-nearest-thousandth$0.002Developer Utilities
SAS triangle solver
two sides and the included angle
POST /math/sas-triangle$0.002Developer Utilities
Scatter plot calculator
correlation, slope and intercept
POST /math/scatter-plot$0.002Developer Utilities
Scientific notation
coefficient × 10^n, free
POST /math/scientific-notation$0.002Developer Utilities
Segment addition postulate calculator
find a missing length
POST /math/segment-addition-postulate$0.002Developer Utilities
Segment area calculator
radius and central angle, free
POST /math/segment-area$0.002Developer Utilities
Sig fig calculator
round to N significant figures, free
POST /math/sig-fig$0.002Developer Utilities
Similar right triangles
find the missing corresponding side
POST /math/similar-right-triangles$0.002Developer Utilities
Simplify radicals calculator
√n as a√b, square-free, free
POST /math/simplify-radicals$0.002Developer Utilities
Sine calculator
sin(θ) in degrees or radians, free
POST /math/sin$0.002Developer Utilities
Sin degrees calculator
sine of an angle in degrees, free
POST /math/sin-degrees$0.002Developer Utilities
Sine function calculator
y = a·sin(bx + c) at x, free
POST /math/sine-function$0.002Developer Utilities
Sin triangle calculator
missing side or angle using sine
POST /math/sin-triangle$0.002Developer Utilities
Slant height calculator
cone radius and height
POST /math/slant-height$0.002Developer Utilities
Solving by completing the square
real quadratic roots, free
POST /math/solving-by-completing-the-square$0.002Developer Utilities
Sphere equation
center radius and general form
POST /math/sphere-equation$0.002Developer Utilities
Square feet of a rectangle
area from length × width
POST /math/square-feet-of-rectangle$0.002Developer Utilities
Triangle square feet calculator
area from base × height
POST /math/square-feet-triangle$0.002Developer Utilities
Standard form calculator
integer Ax + By = C
POST /math/standard-form$0.002Developer Utilities
Square of a binomial
expand (ax+b)² to a², 2ab, b²
POST /math/square-of-a-binomial$0.002Developer Utilities
Star shape calculator
pointed star area and perimeter
POST /math/star-shape$0.002Developer Utilities
Substitution method
solve two-variable linear systems, free
POST /math/substitution-method$0.002Developer Utilities
Sum and difference identities
sin and cos of a±b, free
POST /math/sum-difference-identities$0.002Developer Utilities
Sum of series calculator
first n arithmetic or geometric terms
POST /math/sum-of-series$0.002Developer Utilities
Surface area of a triangular prism
SA from sides and length
POST /math/surface-area-of-a-triangular-prism$0.002Developer Utilities
Surface area calculator
cube, sphere, cylinder, cone
POST /math/surface-area$0.002Developer Utilities
Surface area to volume ratio
cube, sphere or cylinder
POST /math/surface-area-volume-ratio$0.002Developer Utilities
Systems of equations solver
unique x and y, free
POST /math/systems-of-equations$0.002Developer Utilities
Tangent of an angle
tan(θ) in degrees or radians, free
POST /math/tangent-angle$0.002Developer Utilities
Tangent circle calculator
length from an external point
POST /math/tangent-circle$0.002Developer Utilities
Tensor product calculator
Kronecker product of two matrices
POST /math/tensor-product$0.002Developer Utilities
Tan inverse calculator
arctan of a number in radians or degrees
POST /math/tan-inverse$0.002Developer Utilities
Trapezoid area
(base a + base b) / 2 × height
POST /math/trapezoid$0.002Developer Utilities
Trapezoid height calculator
area and two bases, free
POST /math/trapezoid-height$0.002Developer Utilities
30-60-90 triangle sides
from one given side and position
POST /math/triangle-30-60-90$0.002Developer Utilities
Triangle angle calculator
missing interior angle from two angles
POST /math/triangle-angle$0.002Developer Utilities
Triangle degree calculator
third angle from two given angles
POST /math/triangle-degree$0.002Developer Utilities
Triangle proportionality theorem
missing segment length
POST /math/triangle-proportionality-theorem$0.002Developer Utilities
Triangle ratio calculator
unknown side from a known side
POST /math/triangle-ratio$0.002Developer Utilities
Triangle side calculator
missing side by Pythagoras
POST /math/triangle-side$0.002Developer Utilities
Triangle side from two sides and included angle
law of cosines
POST /math/triangle-side-angle$0.002Developer Utilities
Triangle sum theorem
verify three interior angles add to 180°
POST /math/triangle-sum-theorem$0.002Developer Utilities
Triangle vertices calculator
area, perimeter and sides
POST /math/triangle-vertices$0.002Developer Utilities
Trig functions
sin cos tan from angle
POST /math/trig$0.002Developer Utilities
Trig identities calculator
Pythagorean and double-angle
POST /math/trig-identities$0.002Developer Utilities
Six trigonometric functions from radians
POST /math/trigonometric-functions$0.002Developer Utilities
Truncated cone calculator
volume and surface from two radii and height
POST /math/truncated-cone$0.002