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Browse the tool catalog - Math, Date & Finance | Page 23

Calculators, numerics, date logic, statistics, and finance tools Page 23.

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Math & Numbers

pH Calculator

Convert between pH, [H+], pOH and [OH-], or compute pH from a strong acid/base concentration, including dilution.

Math & Numbers

pH & Buffer Calculator

Calculate buffer solution pH with the Henderson-Hasselbalch equation, or find the acid/base ratio needed for a target pH.

Math & Numbers

Poisson Distribution Calculator

Calculate exact, cumulative, and upper-tail Poisson probabilities from an expected event rate

Math & Numbers

Percentile to Z-Score Calculator

Convert a normal percentile, tail area, or central area into a standard normal z-score

Math & Numbers

Permutation Calculator

Calculate permutations with or without repetition, plus circular arrangements, with formulas and optional steps

Math & Numbers

Perimeter Calculator

Calculate the perimeter of various geometric shapes

Math & Numbers

Normal Distribution Plotter

Plot a normal-distribution bell curve as SVG with z-score markers, interval or tail-probability shading, and 68/95/99.7 standard-deviation bands.

Math & Numbers

Newton-Raphson Root Finder

Newton-Raphson iteration for f(x) = 0 with analytic or numeric derivative, full iteration table, and explicit convergence/divergence reporting.

Math & Numbers

Numerical Differentiation Calculator (f′(x))

Forward, backward, and central finite differences for f′(x₀) plus the central second derivative, with optional per-method error against the exact derivative.

Math & Numbers

Simpson's Rule Integrator (∫f(x)dx)

Composite Simpson's 1/3 rule for ∫f(x)dx (even n): node table with weights, integral estimate, optional exact value, O(h⁴) accuracy.

Math & Numbers

Trapezoidal Rule Integrator (∫f(x)dx)

Composite trapezoidal rule for ∫f(x)dx: node table, integral estimate, optional exact value and O(h²) error report.

Math & Numbers

Modular Inverse Calculator (Extended Euclidean Algorithm)

a⁻¹ mod m via extended Euclid with Bézout coefficients, an optional step table, and an a × a⁻¹ ≡ 1 (mod m) verification; RSA-sized inputs supported.