Calculators / Unit converter10 tools

Best unit converters

Convert length, weight, temperature, volume and more. Facts come from each tool's own pages, and every score says where it comes from. How we rank

Tools: 10
Researched: 3
Free option: 1
Only listed: 7

Disclosure: agathox makes some of the tools listed here. They are labelled and scored by the same method as every other tool.

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Unit converter on agathox

Ranked by signals we can measure or quote: website health, the facts each tool's own pages state, and community discussion. Nothing here has been hands-on tested yet, so this is not a quality test. How the signals rank works

Quick answer

No signup needed: agathox calculators
Files stay on your device: agathox calculators

Based on what each tool's own pages say. A tool is left out when its pages say it varies or do not say. Details are listed under each tool.

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1
Convert-me.com
Free optionSignup unclearFile handling unclearHealth 4.4
CompareOpen Convert-me.com
Details and sources
Free tier
The service is free for everyone to use. The page says: “We run convert-me.com since 1996 to provide quick reliable and free units conversion service for everyone to use.”
Paid plan
Not stated.
Signup
Not stated.
Watermark
Not stated.
Where files go
Not stated.
From the tool's own pages, checked 2026-11-08. Sources: Home. Prices and limits change; check the tool before you rely on them.
Read automatically by a program, not by a person. Each fact quotes the sentence it came from, and a fact is shown only if that sentence is on the page. Where a page did not say, it reads “Not stated.”
Full page for Convert-me.com
2
Inch Calculator
UnclearSignup unclearFile handling unclearHealth 4
CompareOpen Inch Calculator
Details and sources
Free tier
Not stated. The terms list no fees for the calculators.
Paid plan
Not stated.
Signup
No account or sign-in is mentioned in the privacy policy or terms.
Watermark
Not applicable.
Where files go
The pages do not say where calculator inputs are processed. Server logs record IP address, browser type and similar details; no retention period is given. The site uses ad partners (Raptive, Google, Amazon, Networx).
From the tool's own pages, checked 2026-11-01. Sources: Privacy policy, Terms of use. Prices and limits change; check the tool before you rely on them.
Full page for Inch Calculator
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agathox calculatorsMade by agathox
UnclearNo signupFiles stay on your device—
CompareOpen agathox calculators
Details and sources
No facts have been read from this tool's pages yet.
Full page for agathox calculators

Unit converter: tools compared
Tool	Free option	Signup	Your files	Scores	Compare, open or show details
1Convert-me.com	Yes	Unclear	Unclear	Health 4.4Signals 3.9	CompareOpen
Free tier The service is free for everyone to use. The page says: “We run convert-me.com since 1996 to provide quick reliable and free units conversion service for everyone to use.” Paid plan Not stated. Signup Not stated. Watermark Not stated. Where files go Not stated. From the tool's own pages, checked 2026-11-08. Sources: Home. Prices and limits change; check the tool before you rely on them. Read automatically by a program, not by a person. Each fact quotes the sentence it came from, and a fact is shown only if that sentence is on the page. Where a page did not say, it reads “Not stated.” Full page for Convert-me.com
2Inch Calculator	Unclear	Unclear	Unclear	Health 4Signals 3.6	CompareOpen
Free tier Not stated. The terms list no fees for the calculators. Paid plan Not stated. Signup No account or sign-in is mentioned in the privacy policy or terms. Watermark Not applicable. Where files go The pages do not say where calculator inputs are processed. Server logs record IP address, browser type and similar details; no retention period is given. The site uses ad partners (Raptive, Google, Amazon, Networx). From the tool's own pages, checked 2026-11-01. Sources: Privacy policy, Terms of use. Prices and limits change; check the tool before you rely on them. Full page for Inch Calculator
-agathox calculatorsMade by agathox	Unclear	Not needed	On your device	—	CompareOpen
No facts have been read from this tool's pages yet. Full page for agathox calculators

Free option, signup and file handling come from each tool's own pages (“Unclear” means they do not say). Hover a score for what it means. Tick “Compare” on two to four tools to read them side by side.

Answers come from each tool's own pages (“Unclear” means they do not say). Tick “Compare” on two to four tools to read them side by side.

Also listed (7, not yet tested)

Each of these answered when we visited its site. We have not tested them or recorded facts, so they are in alphabetical order, not ranked.

ConvertUnits
This online unit conversion tool will help you convert measurement units anytime and solve homework problems quickly using metric conversion tables, SI units, and more.
Open
Metric Conversions
Metric Conversion calculators, tables and formulas for temperature, length, area, volume and weight metric conversions.
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OnlineConversion
Online Conversion is a resource for weights, measures, calculators, converters.
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RapidTables
Online reference and tools - calculators, converters, math, electricity, web design
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Unit Juggler
UnitJuggler offers free and easy unit conversions. Mass conversion, Area conversion, Distance conversion, Volume conversion and many more.
Open
UnitConverters.net
Quick, free, online unit converter that converts common units of measurement, along with 77 other converters covering an assortment of units.
Open
Wolfram Alpha
Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals.
Open