Math & Numbers
Convert between different volume units (liters, gallons, cups, cubic meters, etc.)
volume-converterDate & Time
Convert dates to/from Julian Day Number and Julian calendar
julian-calendarDate & Time
Convert dates to and from RFC 2822 format
rfc-2822-converterMath & Numbers
Evaluate and analyze polynomials
polynomial-calculatorMath & Numbers
Calculate hyperbolic functions (sinh, cosh, tanh)
hyperbolic-calculatorFinance
Compare renting versus buying a home to make informed housing decisions
rent-vs-buyMath & Numbers
Fit zero-order, first-order, and second-order rate equations to concentration-time data. Get reaction order, rate constant k, half-life t½, and R² goodness-of-fit.
reaction-rate-calculatorFinance
Compare a raise or job offer after inflation, convert salary periods, and check whether longer hours erase your hourly gain.
pay-raise-real-purchasing-power-calculatorCalculator
Converts pay bi-directionally (hourly ↔ monthly ↔ annual) under four overtime regimes — US FLSA 1.5x over 40h/week with bonus-blended regular rate, China’s 150/200/300% tiers off the 21.75-day month, and contractual-multiplier EU/UK with 48h-average checks — pricing weekday, weekend and holiday overtime, night-shift premium and annual bonus, with itemized subtotals, effective hourly rate and compliance warnings.
overtime-bonus-hourly-wage-converterMath & Numbers
Smallest k with a^k ≡ 1 (mod n) via φ(n) reduction: power table, minimality proof, cyclic subgroup <a>, primitive-root and maximal-order flags.
order-of-element-mod-nMath & Numbers
Decompose N(x)/D(x) into A/(x−r)^j + (Bx + C)/((x−α)² + β²) with long division for improper fractions and numeric residual verification.
partial-fraction-decomposerMath & Numbers
Partial-fraction inverse Laplace transform for proper rational functions: root factorization (real + conjugate pairs), exact coefficient system, term-by-term inversion.
inverse-laplace-calculator