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
Hours pay calculator
hours, rate and overtime multiplier to gross
POST /fin/hours-pay$0.002Developer Utilities
HR software ROI calculator
savings vs software and implementation cost
POST /fin/hr-software-roi$0.002Developer Utilities
Illinois income tax calculator
4.95% flat rate, tax owed
POST /fin/illinois-tax$0.002Developer Utilities
Australian income tax calculator
tax payable and effective rate
POST /fin/income-tax-australia$0.002Developer Utilities
Information ratio calculator
active return over tracking error
POST /fin/information-ratio$0.002Developer Utilities
Interest rate calculator
implied rate from principal, FV, n
POST /fin/interest-rate$0.002Developer Utilities
Intrinsic value calculator
DCF from free cash flow, free
POST /fin/intrinsic-value$0.002Developer Utilities
Investment fees calculator
future value with and without fees
POST /fin/investment-fees$0.002Developer Utilities
Labor cost calculator
hours, hourly rate and payroll burden
POST /fin/labor-cost$0.002Developer Utilities
Land loan payment calculator
monthly payment from amount and term
POST /fin/land-loan-payment$0.002Developer Utilities
Lease mileage calculator
overage cost from miles and rate
POST /fin/lease-mileage$0.002Developer Utilities
Lerner index calculator
market power from price and cost
POST /fin/lerner-index$0.002Developer Utilities
Lifetime earnings calculator
salary, raise, and working years
POST /fin/lifetime-earnings$0.002Developer Utilities
Liquid net worth calculator
cash, securities minus liabilities
POST /fin/liquid-net-worth$0.002Developer Utilities
Loan comparison calculator
which of two loans is cheaper
POST /fin/loan-comparison$0.002Developer Utilities
Loan interest calculator
total interest from principal and term
POST /fin/loan-interest$0.002Developer Utilities
Loss ratio calculator
incurred losses over earned premiums
POST /fin/loss-ratio$0.002Developer Utilities
Lost wages assistance calculator
weekly benefit times eligible weeks
POST /fin/lost-wages-assistance$0.002Developer Utilities
LTV calculator
loan-to-value ratio as a percent
POST /fin/ltv$0.002Developer Utilities
Lumpsum plus SIP calculator
future value of both
POST /fin/lumpsum-plus-sip$0.002Developer Utilities
Margin calculator
profit margin from revenue and COGS
POST /fin/margin$0.002Developer Utilities
Margin call calculator
stock price that triggers a call
POST /fin/margin-call$0.002Developer Utilities
Margin-discount calculator
list price that preserves target margin
POST /fin/margin-discount$0.002Developer Utilities
Marginal cost calculator
extra unit cost from ΔTC and ΔQ
POST /fin/marginal-cost$0.002Developer Utilities
Bertrand paradox calculator
random chord vs triangle side
POST /stat/betrand-paradox$0.002Developer Utilities
Chebyshev's theorem calculator
min proportion within k σ
POST /stat/chebyshevs-theorem$0.002Developer Utilities
Coin flipper
simulate fair heads or tails with a seed, free
POST /stat/coin-flipper$0.002Developer Utilities
Combinations without repetition
C(n,k) n choose k, free
POST /stat/combinations-without-repetition$0.002Developer Utilities
Confusion matrix calculator
TP, TN, FP, FN from labels
POST /stat/confusion-matrix$0.002Developer Utilities
Critical value calculator
standard normal z for α
POST /stat/critical-value$0.002Developer Utilities
D20 dice roller
seeded twenty-sided die, result 1–20, free
POST /stat/d20-dice-roller$0.002Developer Utilities
Decimal random number generator
seeded min-max decimal, free
POST /stat/decimal-random-number-generator$0.002Developer Utilities
Dice expected value and variance
fair n-sided die, n rolls
POST /stat/dice$0.002Developer Utilities
Dispersion calculator
range, variance and standard deviation
POST /stat/dispersion$0.002Developer Utilities
D&D dice roller
2d6+3 notation, faces and total, free
POST /stat/dnd-dice-roller$0.002Developer Utilities
Error propagation calculator
combined uncertainty from a formula
POST /stat/error-propagation$0.002Developer Utilities
False positive rate calculator
FPR from FP and TN
POST /stat/false-positive$0.002Developer Utilities
Fisher's exact test calculator
2x2 table p-value free
POST /stat/fishers-exact-test$0.002Developer Utilities
Fractional odds converter
decimal, implied probability, profit
POST /stat/fractional-odds$0.002Developer Utilities
Histogram calculator
bin ranges and frequencies from data
POST /stat/histogram$0.002Developer Utilities
Hypergeometric distribution
P(X=k) without replacement
POST /stat/hypergeometric-distribution$0.002Developer Utilities
IQR calculator
interquartile range as Q3 minus Q1
POST /stat/iqr$0.002Developer Utilities
Joint probability calculator
P(A and B) from two events
POST /stat/joint-probability$0.002Developer Utilities
Lottery jackpot probability
balls, draw, matches, and odds
POST /stat/lottery$0.002Developer Utilities
MAD calculator
mean absolute deviation from a list of numbers
POST /stat/mad$0.002Developer Utilities
McNemar's test calculator
chi-square and p-value free
POST /stat/mcnemars-test$0.002Developer Utilities
Median calculator
middle value of a list of numbers
POST /stat/median$0.002Developer Utilities
MSE calculator
mean squared error of predicted vs actual
POST /stat/mse$0.002Developer Utilities
Normal approximation calculator
binomial P(X=k) via N(μ,σ)
POST /stat/normal-approximation$0.002Developer Utilities
Or probability calculator
P(A or B) from three probabilities
POST /stat/or-probability$0.002Developer Utilities
Order from least to greatest
sort numbers smallest to largest
POST /stat/order-from-least-to-greatest$0.002Developer Utilities
Password combination calculator
possible passwords from charset size
POST /stat/password-combination$0.002Developer Utilities
Permutation with repetition
n! / (n1! n2! … nk!), free
POST /stat/permutation-with-repetition$0.002Developer Utilities
Pie chart percentage calculator
slices that sum to 100
POST /stat/pie-chart-percentage$0.002Developer Utilities
Post-test probability calculator
disease chance after a test, free
POST /stat/post-test-probability$0.002Developer Utilities
Probability to fraction converter
reduced numerator/denominator
POST /stat/probability-fraction$0.002Developer Utilities
Quartic regression calculator
least-squares 4th-degree fit, free
POST /stat/quartic-regression$0.002Developer Utilities
Random dice roller
N dice of S sides, faces and total, free
POST /stat/random-dice-roller$0.002Developer Utilities
Relative error calculator
|measured − true| / |true|
POST /stat/relative-error$0.002Developer Utilities
Sampling distribution of a sample proportion
mean and SD
POST /stat/sampling-distribution-sample-proportion$0.002