Free online tools that run in your browser
Your files never leave your device · No login required · 100% free
Convert, compress, calculate, generate, edit and check files right in your browser — fast, private and easy to use.
Search results
Popular tools
View all toolsBrowse by category
Popular file conversions
View all convertersProgramming
Learn and practise programming in your browser. Pick a language: write code, run it in a real terminal and follow the lessons step by step.
Why Shiklo Tools?
Simple, private tools that just work — right in your browser.
- Private Everything runs in your browser. Files are never uploaded.
- Secure Encrypted HTTPS connection, and nothing you open is stored on our servers.
- No login required No account, no sign-up, no email. Just open a tool and use it.
- Fast No upload or download wait — results appear instantly.
- Free All tools are free to use, with no limits.
- Works everywhere Phone, tablet or computer, in any modern browser.
🆕 New tools
★ Popular tools
Recently used
Frequently asked questions
Are my files or text uploaded anywhere?
No. Every tool runs inside your browser on your own device. Nothing you enter or open is sent to a server.
Do I need to create an account or log in?
No login is required. There are no accounts — open any tool and start using it straight away.
Are the tools really free?
Yes. All tools are free, with no limits or watermarks. The site is supported by ads.
Does it work on my phone?
Yes. The tools work in any modern browser on phones, tablets and computers.
Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
Which file types are supported?
PDF, Word, Excel, PowerPoint, OpenDocument and RTF documents, JPG, PNG, WebP, HEIC, AVIF, GIF and BMP images, MP4, MOV, WebM and MKV videos, MP3, WAV, M4A, OGG and FLAC audio, ZIP, 7z, RAR, TAR and GZIP archives, CSV, JSON, XML and plain text. Each tool lists exactly what it opens.
All tools with descriptions →
Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio (WHtR), see which band it falls in, and the waist size that keeps it under 0.5.
The waist-to-height ratio is one of the simplest health measures there is: your waist circumference divided by your height. It is a better guide to the health risks of belly fat than BMI, because it looks at where fat is stored rather than at total weight, and it works the same way for men and women of any height. The rule of thumb is easy to remember: keep your waist to less than half your height.
Enter your height and waist and this calculator shows your ratio, which band it falls in, and the largest waist that keeps your ratio below 0.5 at your height. It works in centimetres or in feet and inches. It is a screening tool, not a diagnosis, and nothing you enter is stored or sent anywhere.
How to use Waist-to-Height Ratio Calculator
- Choose metric or imperial units.
- Enter your height.
- Measure your waist as described and enter it.
- Read your ratio, its band, and the waist size for a ratio under 0.5.
Features
- Waist-to-height ratio to two decimals.
- Band: low, healthy, increased risk or high risk.
- Largest waist for a ratio under 0.5 at your height.
- Table of waist sizes for each band at your height.
- Metric or imperial units.
- Runs in your browser; nothing is stored or sent.
Why waist size matters
Fat stored around the organs in the abdomen — visceral fat — is linked much more strongly to type 2 diabetes, high blood pressure and heart disease than fat on the hips and thighs. BMI cannot see where fat is, so it can underestimate risk in people of normal weight who carry fat around the middle, and overestimate it in muscular people. Waist circumference captures abdominal fat, and dividing it by height makes the measure fair for tall and short people alike. Large studies have found the ratio predicts cardiometabolic risk at least as well as BMI, and in 2022 the UK's NICE guidance adopted it alongside BMI for adults.
What the ratio means
The same cut-offs are used for men and women. They are guides for adults, not sharp lines — risk rises gradually as the ratio rises.
| Ratio | Band | What it suggests |
|---|---|---|
| below 0.4 | Low | Check you are not underweight |
| 0.4 to 0.49 | Healthy | No increased risk from abdominal fat |
| 0.5 to 0.59 | Increased risk | Worth reducing waist size |
| 0.6 and above | High risk | Talk to a doctor about your health |
How to measure your waist
Stand up straight and breathe out normally. Find the bottom of your lowest rib and the top of your hip bone, and measure halfway between them — for many people that is around the belly button, but not always. Keep the tape level all the way round, snug but not pressing into the skin, and don't hold your breath or pull your stomach in. Measure twice and use the average. Use the same tape and the same spot each time if you are tracking change, because small differences in technique affect the result more than a week of diet will.
Limits of the measure
The ratio is a screening measure, not a diagnosis. It does not apply during pregnancy, and different cut-offs are used for children. Some ethnic groups have higher risk at the same ratio, which is one reason doctors look at several measures together, including blood pressure, blood sugar and cholesterol. A high ratio is a reason to look more closely at your health, and a healthy ratio does not rule out other problems. For your overall weight picture, combine it with the BMI Calculator and the Body Fat Calculator.
Frequently asked questions
What is a healthy waist-to-height ratio?
Between 0.4 and 0.5 for adults. Below 0.5 means your waist is less than half your height.
How do I calculate it?
Divide your waist circumference by your height, both in the same units.
Is it better than BMI?
It captures belly fat, which BMI cannot. Many studies find it predicts heart and diabetes risk at least as well; doctors often use both.
Are the cut-offs different for men and women?
No. The same 0.5 guide is used for both.
Where do I measure my waist?
Halfway between your lowest rib and the top of your hip bone, after breathing out.
Can children use it?
Children's cut-offs differ, so this calculator is meant for adults.
Is my data saved?
No. The calculation happens in your browser and nothing is stored or sent.
Related tools
BMI CalculatorCalculate your body mass index in metric or imperial units and see your WHO weight category, the healthy weight range for your height and a visual scale.
Body Fat CalculatorEstimate your body fat percentage with the US Navy tape-measure method or from BMI, with fat mass, lean mass and the ACE category.
Ideal Weight CalculatorIdeal body weight for your height and sex with the Devine, Robinson, Miller and Hamwi formulas and the healthy BMI weight range.
Lean Body Mass CalculatorEstimate your lean body mass and fat mass with the Boer, James and Hume formulas, or exactly from a known body-fat percentage.
Blood Pressure CheckerCheck which blood pressure category your reading falls in — normal, elevated, stage 1, stage 2 or crisis — and what to do next.
Calorie Deficit CalculatorHow many calories to eat each day to reach your goal weight at a safe pace, with the daily deficit, the expected goal date and safety warnings.