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
Principle of moments calculator
balance moments about a pivot
POST /mech/principle-of-moments$0.002Developer Utilities
Force equilibrium checker
residual of coplanar forces
POST /mech/equilibrium-check$0.002Developer Utilities
Long addition calculator
digit-by-digit sum with carry
POST /math/long-addition$0.002Developer Utilities
Long subtraction calculator
digit-by-digit borrow, free
POST /math/long-subtraction$0.002Developer Utilities
Lowest common denominator calculator
LCD of a list of fractions
POST /math/lowest-common-denominator$0.002Developer Utilities
Fraction to Lowest Terms Calculator
POST /math/lowest-term$0.002Developer Utilities
Luhn algorithm validator
check any number string
POST /math/luhn$0.002Developer Utilities
Magic square generator
odd order via the Siamese method, free
POST /math/magic-square$0.002Developer Utilities
Power calculator
raise a base to an exponent, free
POST /math/math-power$0.002Developer Utilities
Matrix calculator
add, subtract, or multiply two matrices
POST /math/matrix$0.002Developer Utilities
Matrix norm calculator
Frobenius, one and infinity norms
POST /math/matrix-norm$0.002Developer Utilities
Mayan numeral converter
decimal to dots and bars
POST /math/mayan-numeral$0.002Developer Utilities
Midsegment of a triangle calculator
POST /math/midsegment-of-a-triangle$0.002Developer Utilities
Minutes to decimal degrees calculator
convert angle minutes
POST /math/minutes-to-decimals-degrees$0.002Developer Utilities
Mixed Number to Improper Fraction Calculator
POST /math/mixed-number-to-improper-fraction$0.002Developer Utilities
Integer palindrome checker
same forwards and backwards
POST /math/miracle$0.002Developer Utilities
Missing side of a right triangle
find the third side from two sides
POST /math/missing-side-of-a-right-triangle$0.002Developer Utilities
Mixed number converter
improper fraction to whole + remainder
POST /math/mixed-number$0.002Developer Utilities
Modulo order of operations calculator
+ − × ÷ % PEMDAS
POST /math/modulo-order-of-operations$0.002Developer Utilities
Multiplicative inverse calculator
reciprocal 1/x, free
POST /math/multiplicative-inverse$0.002Developer Utilities
Multiplicative inverse modulo n
a⁻¹ via extended Euclidean
POST /math/multiplicative-inverse-modulo$0.002Developer Utilities
Multiplying fractions
product in lowest terms, free
POST /math/multiplying-fractions$0.002Developer Utilities
Multiplying radicals calculator
simplify the product of two roots
POST /math/multiplying-radicals$0.002Developer Utilities
Natural log calculator
ln(x) of a positive number, free
POST /math/natural-log$0.002Developer Utilities
Oblique triangle calculator
remaining sides and angles
POST /math/oblique-triangle$0.002Developer Utilities
Obtuse triangle checker
three sides, converse of Pythagoras
POST /math/obtuse-triangle$0.002Developer Utilities
Bitwise OR calculator
compute a | b of two integers
POST /math/or$0.002Developer Utilities
Pentagon calculator
regular pentagon area and perimeter
POST /math/pentagon$0.002Developer Utilities
Percentage change calculator
signed % from old to new
POST /math/percentage-change$0.002Developer Utilities
Percentage difference calculator
relative to the average
POST /math/percentage-difference$0.002Developer Utilities
Percent of time calculator
elapsed vs total duration
POST /math/percent-time$0.002Developer Utilities
Percentage of a percentage calculator
X% of Y%
POST /math/percentage-of-percentage$0.002Developer Utilities
Perfect square trinomial
factor ax²+bx+c if it is a square
POST /math/perfect-square-trinomial$0.002Developer Utilities
Rectangle perimeter from area and one side
P = 2(s + A/s)
POST /math/perimeter-of-a-rectangle-with-given-area$0.002Developer Utilities
Perimeter of a sector
arc plus two radii
POST /math/perimeter-of-a-sector$0.002Developer Utilities
Triangle perimeter from vertices
three coordinates, free
POST /math/perimeter-of-a-triangle-with-vertices$0.002Developer Utilities
Perimeter of a rectangle
P = 2(L + W) from length and width
POST /math/perimeter-of-rectangle$0.002Developer Utilities
Phase shift calculator
horizontal shift −C/B of a sinusoid
POST /math/phase-shift$0.002Developer Utilities
Polar decomposition calculator
orthogonal and PSD factors
POST /math/polar-decomposition$0.002Developer Utilities
Polar form of a complex number
magnitude and angle
POST /math/polar-form$0.002Developer Utilities
Polygon angle
interior and exterior
POST /math/polygon-angle$0.002Developer Utilities
Polynomial division calculator
quotient and remainder, free
POST /math/polynomial-division$0.002Developer Utilities
Polynomial graphing calculator
sample x-y points, free
POST /math/polynomial-graphing$0.002Developer Utilities
Power modulo calculator
remainder of base^exp mod m
POST /math/power-modulo$0.002Developer Utilities
Power of a power calculator
(a^m)^n = a^(mn), free
POST /math/power-of-a-power$0.002Developer Utilities
Power-reducing identities calculator
sin²(θ) and cos²(θ)
POST /math/power-reducing$0.002Developer Utilities
Prisoner's dilemma calculator
both scores from one round
POST /math/prisoners-dilemma$0.002Developer Utilities
Pyramid angle calculator
slant-edge to base from side and height
POST /math/pyramid-angle$0.002Developer Utilities
Pythagorean triples
generate primitives up to a hypotenuse
POST /math/pythagorean-triples$0.002Developer Utilities
QR decomposition
factor matrix into Q and R
POST /math/qr-decomposition$0.002Developer Utilities
Quarter circle perimeter
P = r(π/2 + 2) from radius
POST /math/quarter-circle-perimeter$0.002Developer Utilities
Quaternion calculator
norm and conjugate of w + xi + yj + zk
POST /math/quaternion$0.002Developer Utilities
Simplify radical
√n to simplest form a√b, free
POST /math/radical$0.002Developer Utilities
Radius of a circle
r = C/(2π) from circumference, free
POST /math/radius-of-a-circle$0.002Developer Utilities
Sphere radius calculator
from volume, surface or diameter
POST /math/radius-of-sphere$0.002Developer Utilities
Ratio of 2 numbers calculator
simplify a:b by GCD
POST /math/ratio-of-2-numbers$0.002Developer Utilities
Rational exponents calculator
evaluate a^(p/q), free
POST /math/rational-exponents$0.002Developer Utilities
Rationalize denominator calculator
rewrite a/√n, free
POST /math/rationalize-denominator$0.002Developer Utilities
Reciprocal calculator
1/x for any finite non-zero number
POST /math/reciprocal$0.002Developer Utilities
Rectangle diagonal angle calculator
from length and width
POST /math/rectangle-diagonal-angle$0.002