# Length

Browse 59 online length tools for working with length-related data and formats. Use them in your browser; text inputs are not stored and uploaded files are deleted after 6 hours.

> Canonical page: https://elysiatools.com/en/tags/length

## Overview

Explore 59 Length tools for processing, converting, validating, and managing length-related files and data through a browser interface, with no software installation required.

## Frequently asked questions

### What can I do with Length tools?

Length tools help you process, convert, validate, and manage length-related files and data through the browser.

### Do I need to install software?

No software installation is required. You can operate the tools through the browser interface.

### How is my data handled?

Your request is submitted from the browser and processed on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

## Tools

- [Argon2 Password Hash Generator](https://elysiatools.com/en/tools/argon2-password-hash-generator): Generate Argon2id password hashes with tunable memory, iterations, parallelism, salt length, and PHC output
- [Array Grouper](https://elysiatools.com/en/tools/array-grouper): Group array elements based on various criteria such as length, alphabetical order, numeric ranges, custom conditions, and more
- [Audio Duration Checker](https://elysiatools.com/en/tools/audio-duration-checker): Get the exact duration of an audio file
- [CM to Inches](https://elysiatools.com/en/tools/cm-to-inches): Convert centimeters to inches with configurable decimal precision
- [CM to MM](https://elysiatools.com/en/tools/cm-to-mm): Convert centimeters to millimeters with configurable decimal precision
- [Column Buckling Load Calculator (Euler)](https://elysiatools.com/en/tools/column-buckling-load): Calculate the Euler critical buckling load of an axially loaded column: P_cr = π²·E·I/(K·L)². Supports pinned-pinned (K=1), fixed-free (K=2), fixed-pinned (K=0.7), fixed-fixed (K=0.5). Returns effective length, radius of gyration, slenderness ratio λ, and critical stress σ_cr.
- [Credit Hour Calculator](https://elysiatools.com/en/tools/credit-hour-calculator): Estimate academic credit hours from weekly lecture, lab, studio, term length, and contact-hour rules
- [Cylinder Radial Heat Conduction (Q=2πkL·ΔT/ln(r₂/r₁))](https://elysiatools.com/en/tools/cylinder-radial-conduction): Compute radial steady-state heat conduction through a single-layer cylindrical wall (Fourier's law in cylindrical coordinates): radial heat flow rate Q = 2π·k·L·ΔT/ln(r₂/r₁) (W), inner-surface heat flux q_inner = Q/(2π·r₁·L) (W/m²), outer-surface heat flux q_outer = Q/(2π·r₂·L) (W/m²), and cylindrical thermal resistance R = ln(r₂/r₁)/(2π·k·L) (K/W). k is the thermal conductivity (W/(m·K)); L the cylinder length; r₁ the inner radius, r₂ the outer radius (must have r₂ > r₁ > 0); ΔT the temperature difference (K; a °C difference equals a K difference, a °F difference is converted by ×5/9). ΔT may be negative (indicating reverse heat flow), but k, L, r₁ and r₂ must be positive. Length and radius in m/cm/mm.
- [Daylight Calculator](https://elysiatools.com/en/tools/daylight-calculator): Calculate daylight hours, sunrise, and sunset times for any location and date
- [Drag Force Calculator (F_D = ½·ρ·v²·C_D·A)](https://elysiatools.com/en/tools/drag-force-calculator): Compute the drag force on a body in a fluid stream: F_D = ½·ρ·v²·C_D·A (N), where ρ is the fluid density, v the free-stream velocity, C_D the drag coefficient (shape- and Reynolds-dependent), and A the reference (frontal projected) area. A built-in shape library supplies typical high-Re C_D values: sphere 0.47, hemisphere 0.42, long cylinder 0.81, disk/flat plate 1.17, cube 1.05, streamlined airfoil 0.04, long streamlined ellipsoid 0.07, cone 0.50; or choose 'Custom' to enter C_D directly. Optionally, with dynamic viscosity μ and characteristic length L, the Reynolds number Re = ρ·v·L/μ is computed, and the power dissipated by drag P = F_D·v (W). Density in kg/m³/g/cm³, velocity in m/s/km/h, area in m²/cm²/mm², length in m/cm/mm.
- [Feet to Meter](https://elysiatools.com/en/tools/feet-to-meter): Convert feet to meters with configurable decimal precision
- [Feet to Yard](https://elysiatools.com/en/tools/feet-to-yard): Convert feet to yards with configurable decimal precision
- [Fetal Development Timeline (by Gestational Week)](https://elysiatools.com/en/tools/fetal-development-timeline): See week-by-week fetal development from conception to birth (40 weeks). Enter your LMP date or a known gestational age and the tool highlights the current week with size, weight and milestones.
- [Fibonacci Sequence Generator](https://elysiatools.com/en/tools/fibonacci-generator): Generate Fibonacci sequence with customizable start numbers, length, and output format. Includes golden ratio analysis and mathematical properties.
- [Field of View Calculator](https://elysiatools.com/en/tools/field-of-view-calculator): Calculate camera field of view from focal length and sensor size, with scene coverage at distance.
- [Frequency ⇄ Wavelength Converter (Hz/kHz/MHz/GHz/THz ⇄ m/cm/mm/nm)](https://elysiatools.com/en/tools/frequency-wavelength): Convert between frequency and wavelength with selectable medium; results in all common frequency and length units
- [Hangman Game](https://elysiatools.com/en/tools/hangman-game): Classic hangman word-guessing game. Guess the hidden word letter by letter; six wrong guesses ends the game. Three difficulty levels, with general, animals, food, and science categories.
- [Hash Algorithm Comparator](https://elysiatools.com/en/tools/hash-algorithm-comparator): Hash the same input with MD5, SHA-1, SHA-256, SHA-512, BLAKE2b, and BLAKE3 at the same time and compare them side by side: output length, hex/Base64 digest, security status (broken / modern), and a relative speed benchmark. Great for teaching, choosing a hashing algorithm, or sanity-checking checksums.
- [Inches to CM](https://elysiatools.com/en/tools/inches-to-cm): Convert inches to centimeters with configurable decimal precision
- [Inches to Meter](https://elysiatools.com/en/tools/inches-to-meter): Convert inches to meters with configurable decimal precision
- [Inches to MM](https://elysiatools.com/en/tools/inches-to-mm): Convert inches to millimeters with configurable decimal precision
- [Inches to Yard](https://elysiatools.com/en/tools/inches-to-yard): Convert inches to yards with configurable decimal precision
- [KM to Meter](https://elysiatools.com/en/tools/km-to-meter): Convert kilometers to meters with configurable decimal precision
- [Length Unit Converter](https://elysiatools.com/en/tools/length-unit-converter): Convert between different length units (meters, feet, inches, miles, etc.)

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