Calculators / BMI calculator15 tools

Best BMI calculators

Body mass index from height and weight. Facts come from each tool's own pages, and every score says where it comes from. How we rank

Tools: 15
Researched: 4
Free option: 3
Only listed: 11

Made by agathox · free, no sign-up, runs in your browser

Need BMI calculator right now? Try ours.

We build this tool, so it is labelled. It is scored with the same tests as the rest, and this box never changes the ranking below.

BMI calculator 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, Calculator.net
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.

Show only:

Want two of these head to head? Compare tools side by side.

1
agathox calculatorsMade by agathox
Free optionNo signupFiles stay on your deviceHealth 4.6
CompareOpen agathox calculators
Details and sources
Free tier
Free to use. No paid plan and no limits on how many files you process.
Paid plan
There is no paid plan.
Signup
No account or sign-up is needed.
Watermark
Nothing is added to your files.
Where files go
Runs in your browser, so files are not uploaded.
From the tool's own pages, checked 2026-11-10. Sources: Privacy page. Prices and limits change; check the tool before you rely on them.
Full page for agathox calculators
2
Omni Calculator
Free optionSignup unclearFile handling unclearHealth 3.7
CompareOpen Omni Calculator
Details and sources
Free tier
Omni Calculator provides 3938 free calculators. The page says: “Omni Calculator . . . . . Your life in . 3938 free calculators.”
Paid plan
Not stated.
Signup
Not stated.
Watermark
Not stated.
Where files go
Not stated.
From the tool's own pages, checked 2026-11-04. 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 Omni Calculator
3
Calculator.net
Free optionNo signupFile handling unclearHealth 3.5
CompareOpen Calculator.net
Details and sources
Free tier
All tools and services provided by Calculator.net are completely free. The page says: “Therefore, all of our tools and services are completely free, with no registration required.”
Paid plan
Not stated.
Signup
No registration is required to use the calculators. The page says: “Therefore, all of our tools and services are completely free, with no registration required.”
Watermark
Not stated.
Where files go
Not stated.
From the tool's own pages, checked 2026-11-04. 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 Calculator.net
4
Calculator Academy
UnclearSignup unclearFile handling unclearHealth 3.8
CompareOpen Calculator Academy
Details and sources
Free tier
Not stated.
Paid plan
Not stated.
Signup
Not stated.
Watermark
Not applicable.
Where files go
The privacy policy does not say where calculator inputs are processed or stored, or how long they are kept. It says ads are served via Raptive and that advertising cookies and Google Analytics are used.
From the tool's own pages, checked 2026-11-01. Sources: Privacy policy. Prices and limits change; check the tool before you rely on them.
Full page for Calculator Academy

BMI calculator: tools compared
Tool	Free option	Signup	Your files	Scores	Compare, open or show details
1agathox calculatorsMade by agathox	Yes	Not needed	On your device	Health 4.6Signals 4.3	CompareOpen
Free tier Free to use. No paid plan and no limits on how many files you process. Paid plan There is no paid plan. Signup No account or sign-up is needed. Watermark Nothing is added to your files. Where files go Runs in your browser, so files are not uploaded. From the tool's own pages, checked 2026-11-10. Sources: Privacy page. Prices and limits change; check the tool before you rely on them. Full page for agathox calculators
2Omni Calculator	Yes	Unclear	Unclear	Health 3.7Signals 3.4	CompareOpen
Free tier Omni Calculator provides 3938 free calculators. The page says: “Omni Calculator . . . . . Your life in . 3938 free calculators.” Paid plan Not stated. Signup Not stated. Watermark Not stated. Where files go Not stated. From the tool's own pages, checked 2026-11-04. 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 Omni Calculator
3Calculator.net	Yes	Not needed	Unclear	Health 3.5Signals 3.3	CompareOpen
Free tier All tools and services provided by Calculator.net are completely free. The page says: “Therefore, all of our tools and services are completely free, with no registration required.” Paid plan Not stated. Signup No registration is required to use the calculators. The page says: “Therefore, all of our tools and services are completely free, with no registration required.” Watermark Not stated. Where files go Not stated. From the tool's own pages, checked 2026-11-04. 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 Calculator.net
4Calculator Academy	Unclear	Unclear	Unclear	Health 3.8Signals 3.0	CompareOpen
Free tier Not stated. Paid plan Not stated. Signup Not stated. Watermark Not applicable. Where files go The privacy policy does not say where calculator inputs are processed or stored, or how long they are kept. It says ads are served via Raptive and that advertising cookies and Google Analytics are used. From the tool's own pages, checked 2026-11-01. Sources: Privacy policy. Prices and limits change; check the tool before you rely on them. Full page for Calculator Academy

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 (11, 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.

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Clear Bazi Chart
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Mayo Clinic
Mayo Clinic is listed for: bmi calculator.
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NHS
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The Calculator Site
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TIHMLO Password Manager Cost Calculator
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ToolsGavel True-Cost Calculator
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Zubware Age Calculator
Calculate your age on today's date or any cutoff date from your date of birth. Get completed years, months and days, compare three dates, or check your next birthday. Free, no sign-in.
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