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Browse the tool catalog | Page 141

Search and filter the online tool directory by task, format, and category, then open detailed pages with clear inputs, examples, and execution context. Page 141.

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Math, Date & Finance639

Calculators, numerics, date logic, statistics, and finance tools

Images, Audio & Video597

Image, audio, and video processing, conversion, and optimization tools

Design & Color294

Color, layout, graphics, visual styling, and design helper tools

Text & Writing206

Writing, cleanup, formatting, extraction, and text analysis tools

Developer & Web188

Developer utilities, networking, web debugging, and automation helpers

Conversion & Encoding172

Format, file, archive, unit, and encoding conversion tools

Absorbance Quantification and Acid-Base Calculations

JSON Structure Surgery

Tabular Data Cleanup, Shaping, and Normalization

Professional Assembly of an Excel Workbook

PDF Repair, Cleanup, and Slimming

Docs Pricing About Terms of Service Privacy Policy Contact

Science & Education

Planck Blackbody Radiation Calculator

B_λ(T), Wien peak λ_max = b/T, M_λ = πB_λ at the peak and at any wavelength, and the Stefan-Boltzmann total σT⁴.

Science & Education

Malus's Law Polarization Calculator

I = I₀·cos²θ: transmitted intensity and percentage for any polarizer angle, with the 0°/45°/90° landmarks.

Science & Education

Quantum Harmonic Oscillator Energy Levels

E_n = (n + ½)ℏω from k + m, ω, or f: zero-point energy ½ℏω, equal spacing ħω, adjacent-transition photon wavelength, classical turning points, optional level ladder.

Science & Education

Photoelectric Effect Calculator

E_k(max) = hν − φ with preset metal work functions or custom φ: threshold frequency, cutoff wavelength, emission verdict, stopping voltage, and photoelectron speed.

Math & Numbers

Primitive Root Finder

Smallest primitive root mod n with certificate g^(φ/q) ≠ 1, root count φ(φ(n)), up to 50 listed roots, and candidate verification. n ≤ 10¹².

Math & Numbers

Prime Counting Function π(n) Calculator

Exact π(n) via a single-pass Sieve of Eratosthenes (n ≤ 10⁷) with n/ln n comparison, density, average gap, and the largest prime ≤ n.

Math & Numbers

Quadratic Residue Checker (Legendre / Jacobi Symbol)

Jacobi/Legendre symbol with deterministic Miller–Rabin primality, Tonelli–Shanks square roots for prime moduli, and brute-force resolution for small composite moduli.

Math & Numbers

M/M/1 Queue Calculator (L, Lq, W, Wq)

Steady-state M/M/1 metrics: ρ, P0, L, Lq, W, Wq, state probabilities, and Little's-law cross-checks; unstable λ ≥ μ inputs are rejected.

Math & Numbers

M/M/c Multi-Server Queue Calculator

Steady-state M/M/c metrics with the Erlang-C formula: offered load, P0, Pw, Lq, L, W, Wq plus Little's-law cross-checks; unstable λ ≥ cμ inputs are rejected.

Health

Population/Resource Doubling Time (Rule of 70)

Doubling/halving time from a periodic growth rate: rule-of-70/72/69.3 estimate vs exact discrete and continuous times, with a milestone table.

Health

Plaque Forming Units Calculator (PFU/mL)

Compute PFU/mL titer from plaque counts, dilution factor, and plated volume, with multi-plate statistics and 30–300 counting-range warnings.

Media

Podcast Chapter Marker Builder

Build every podcast chapter format from one timecoded list: Podcasting 2.0 JSON + RSS tag, ID3v2.4 CHAP+CTOC burned into an MP3, Vorbis comments, mp4chaps, YouTube timestamps and SRT, with a per-player support matrix.