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Length Tools

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.

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

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Tool usage guide

FAQ

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.

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Lead Generation Quiz Launch and Contact Handoff
Memorial Drafts: Family Review and Print Handoff
Private Habit Records: Backup, Restore and Sharing Review
Article to X and LinkedIn Drafts: Fact Review and Handoff
Markdown Interactive Deck Review and Offline Handoff

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Security

Argon2 Password Hash Generator

Generate Argon2id password hashes with tunable memory, iterations, parallelism, salt length, and PHC output

Development

Array Grouper

Group array elements based on various criteria such as length, alphabetical order, numeric ranges, custom conditions, and more

Media

Audio Duration Checker

Get the exact duration of an audio file

Math & Numbers

CM to Inches

Convert centimeters to inches with configurable decimal precision

Math & Numbers

CM to MM

Convert centimeters to millimeters with configurable decimal precision

Math & Numbers

Column Buckling Load Calculator (Euler)

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.

Math & Numbers

Credit Hour Calculator

Estimate academic credit hours from weekly lecture, lab, studio, term length, and contact-hour rules

Math & Numbers

Cylinder Radial Heat Conduction (Q=2πkL·ΔT/ln(r₂/r₁))

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.

Astronomy

Daylight Calculator

Calculate daylight hours, sunrise, and sunset times for any location and date

Math & Numbers

Drag Force Calculator (F_D = ½·ρ·v²·C_D·A)

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.

Math & Numbers

Feet to Meter

Convert feet to meters with configurable decimal precision

Math & Numbers

Feet to Yard

Convert feet to yards with configurable decimal precision

Health

Fetal Development Timeline (by Gestational Week)

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.

Math & Numbers

Fibonacci Sequence Generator

Generate Fibonacci sequence with customizable start numbers, length, and output format. Includes golden ratio analysis and mathematical properties.

Design

Field of View Calculator

Calculate camera field of view from focal length and sensor size, with scene coverage at distance.

Math & Numbers

Frequency ⇄ Wavelength Converter (Hz/kHz/MHz/GHz/THz ⇄ m/cm/mm/nm)

Convert between frequency and wavelength with selectable medium; results in all common frequency and length units

Games

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.

Cryptography

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.

Math & Numbers

Inches to CM

Convert inches to centimeters with configurable decimal precision

Math & Numbers

Inches to Meter

Convert inches to meters with configurable decimal precision

Math & Numbers

Inches to MM

Convert inches to millimeters with configurable decimal precision

Math & Numbers

Inches to Yard

Convert inches to yards with configurable decimal precision

Math & Numbers

KM to Meter

Convert kilometers to meters with configurable decimal precision

Math & Numbers

Length Unit Converter

Convert between different length units (meters, feet, inches, miles, etc.)

Math

502 tools

Browse 502 online math tools for working with math operations, data, and files in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.

Conversion

369 tools

Browse 369 online conversion tools for transforming data and files between supported formats. Use them in your browser with secure server-side processing.

Meter

33 tools

Browse 33 online Meter tools to process, convert, validate, and manage meter files and data in your browser.

Text

311 tools

Browse 311 online text tools for processing, converting, validating, and managing text, strings, words, and characters in your browser.

Inch

17 tools

Browse 17 online inch tools for working with inch measurements and data. Use them in your browser; text inputs are not stored and uploaded files are deleted after 6 hours.

Text Processing

185 tools

Browse 185 online text processing tools to process, convert, validate, and manage text data in your browser.