Math & Numbers
Convert numbers to continued fraction representation
continued-fractionFinance
Calculate compound interest with daily compounding for savings and investments
compound-interest-dailyMath & Numbers
Group exponent λ(n) from prime factorization with φ(n) comparison, primitive-root existence, Korselt's Carmichael-number detection, and optional sample-unit verification.
carmichael-functionMath & Numbers
Generalized pairwise-merge CRT for 2–20 congruences: coprime moduli give the product modulus, consistent non-coprime moduli give the lcm, inconsistent systems are rejected.
chinese-remainder-theoremMath & Numbers
Calculate the ratio, driven speed and chain linear speed of a chain drive. i = z₂/z₁ = n₁/n₂, chain speed v = z₁·p·n₁/60000. Enter the pitch to compute chain speed.
chain-sprocket-ratioFinance
Calculate credit card cash back rewards across multiple spending categories. Enter categories as 'name, monthly spend $, cash back %' per line. Shows monthly and annual cash back per category, total rewards, effective cash-back rate, and a comparison against a flat-rate card.
cash-back-calculatorMath & Numbers
Convert Celsius to Kelvin with configurable decimal precision
celsius-to-kelvinMath & Numbers
Convert centimeters to millimeters with configurable decimal precision
cm-to-mmMath & Numbers
Run chi-square goodness-of-fit or independence tests from observed counts or contingency tables
chi-square-test-calculatorMath & Numbers
Calculate chi-square distribution PDF, CDF, and right-tail probability from a statistic and degrees of freedom
chi-square-distribution-calculatorMath & Numbers
Calculate coefficient of variation as relative standard deviation for comparing variability across datasets
coefficient-of-variation-calculatorMath & Numbers
Convert Celsius to Fahrenheit with configurable decimal precision
celsius-to-fahrenheit