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 →
Body Fat Calculator
Estimate your body fat percentage with the US Navy tape-measure method or from BMI, with fat mass, lean mass and the ACE category.
Body fat percentage is the share of your body weight that is fat. It tells you more than weight or BMI alone, because two people with the same weight can have very different amounts of muscle and fat. This body fat calculator uses the US Navy method, which needs only a tape measure: your height, waist and neck, plus your hips if you are a woman.
You also get an estimate from your BMI, age and sex for when you don't have a tape at hand, your fat mass and lean mass in kilograms or pounds, and your category on the American Council on Exercise scale, from essential fat to obese. The calculation happens in your browser and nothing is stored.
How to use Body Fat Calculator
- Choose your sex and units, then enter your age, height and weight.
- Measure your waist and neck (and hips for women) with a soft tape and enter them.
- Read your body fat percentage, category, fat mass and lean mass.
- Compare with the BMI-based estimate and the category table.
Features
- US Navy circumference method (Hodgdon and Beckett).
- BMI-based estimate (Deurenberg) as a second opinion.
- Fat mass and lean body mass.
- American Council on Exercise categories for men and women.
- Visual scale with your result.
- Metric and imperial units; nothing stored or sent.
How to measure
Use a soft, non-stretch tape. Stand relaxed and breathe out normally; don't pull your stomach in or pull the tape tight. Measure the waist at the navel for men and at the narrowest point for women, the neck just below the larynx (Adam's apple) with the tape sloping slightly down to the front, and, for women, the hips at the widest point of the buttocks. Take each measurement two or three times and use the average: a one-centimetre error changes the result by about one percentage point.
The formulas
The US Navy formulas were developed by Hodgdon and Beckett in 1984 by comparing tape measurements with underwater weighing. In studies they are usually within 3 to 4 percentage points of a DEXA scan for most people. The BMI method by Deurenberg (1991) only needs height, weight, age and sex, so it can't tell muscle from fat and is less accurate for athletes.
| Method | Formula (lengths in cm) |
|---|---|
| Navy, men | 495 ÷ (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450 |
| Navy, women | 495 ÷ (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.221 × log10(height)) − 450 |
| BMI method | 1.2 × BMI + 0.23 × age − 10.8 × (1 for men, 0 for women) − 5.4 |
What the categories mean
Some fat is essential for hormones, nerves and organs: about 2 to 5 percent for men and 10 to 13 percent for women. Athletes typically sit just above that, people who exercise regularly in the fitness range, and most adults in the average range. Women naturally carry more fat than men at the same fitness level. Higher body fat, especially around the waist, is linked to a higher risk of heart disease and type 2 diabetes, but the categories are a general guide, not a diagnosis.
Tracking changes
Body fat estimates are most useful for tracking change over time. Measure under the same conditions — same time of day, before eating, with the same tape — every two to four weeks. If your weight stays the same while your waist shrinks and the estimated body fat falls, you are likely gaining muscle and losing fat, which the bathroom scale alone would miss. Lean body mass from this tool can also be used in the Katch-McArdle formula in the BMR Calculator.
Frequently asked questions
How accurate is the Navy body fat method?
For most adults it is within about 3 to 4 percentage points of a DEXA scan, provided the measurements are taken carefully.
What is a healthy body fat percentage?
Roughly 14 to 24 percent for men and 21 to 31 percent for women covers the fitness and average ranges on the American Council on Exercise scale.
Why do women need hip measurements?
Women store more fat around the hips and thighs, so the Navy formula for women uses waist plus hips minus neck.
Why does it say to check my measurements?
The formula needs the waist (plus hips for women) to be larger than the neck. If it isn't, a measurement is probably wrong.
Is the BMI-based estimate reliable?
It is a rough guide for typical adults. It can't tell muscle from fat, so it overestimates body fat for muscular people.
Are my measurements saved?
No. They are only used in your browser and are not put in the page address, so they stay out of your browser history.
What is lean body mass?
Everything that isn't fat: muscle, bone, organs and water. It is your weight minus your fat mass.
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.
BMR CalculatorCalculate your basal metabolic rate with the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle formulas, plus daily calories for each activity level.
Ideal Weight CalculatorIdeal body weight for your height and sex with the Devine, Robinson, Miller and Hamwi formulas and the healthy BMI weight range.
TDEE CalculatorFind your total daily energy expenditure — the calories you burn each day — with calorie targets to lose, keep or gain weight and a macro split.
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.