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BMI, calories, pregnancy, and other health calculators.

Water Intake Calculator: Estimate your daily water needs based on weight, exercise and climate, shown in litres, cups and bottlesOctober 1, 2026 · 4 min read · Use the free Water Intake Calculator to estimate your daily water needs based on weight, exercise and climate, shown in litres, cups and bottles.Waist-to-Hip Ratio Calculator: Calculate your waist-to-hip ratio and see your health-risk category by sexOctober 1, 2026 · 3 min read · Use the free Waist-to-Hip Ratio Calculator to calculate your waist-to-hip ratio and see your health-risk category by sex.TDEE Calculator: Compute Total Daily Energy Expenditure from BMR and activity levelOctober 1, 2026 · 3 min read · Use the free TDEE Calculator to compute Total Daily Energy Expenditure from BMR and activity level.Sleep Calculator: Suggest bedtimes or wake times based on 90-minute sleep cyclesOctober 1, 2026 · 3 min read · Use the free Sleep Calculator to suggest bedtimes or wake times based on 90-minute sleep cycles.Protein Intake Calculator: Find your daily protein target range based on body weight and your goalOctober 1, 2026 · 3 min read · Use the free Protein Intake Calculator to find your daily protein target range based on body weight and your goal.Pregnancy Calculator: Track pregnancy progress, week count, and key milestonesOctober 1, 2026 · 3 min read · Use the free Pregnancy Calculator to track pregnancy progress, week count, and key milestones.Running Pace Calculator: Turn a distance and time into pace per km and per mile, plus projected 5K, 10K, half and marathon timesOctober 1, 2026 · 4 min read · Use the free Running Pace Calculator to turn a distance and time into pace per km and per mile, plus projected 5K, 10K, half and marathon times.Ovulation Calculator: Predict fertile windows and ovulation days from cycle dataOctober 1, 2026 · 3 min read · Use the free Ovulation Calculator to predict fertile windows and ovulation days from cycle data.One Rep Max Calculator: Estimate your 1RM from a lift and reps, with a full percentage-of-max training tableOctober 1, 2026 · 4 min read · Use the free One Rep Max Calculator to estimate your 1RM from a lift and reps, with a full percentage-of-max training table.Macro Calculator: Split your daily calories into protein, carbs and fat with diet-style presets and a per-meal breakdownOctober 1, 2026 · 3 min read · Use the free Macro Calculator to split your daily calories into protein, carbs and fat with diet-style presets and a per-meal breakdown.Heart Rate Zone Calculator: Calculate your 5 training heart-rate zones using the Karvonen method with your resting heart rateOctober 1, 2026 · 4 min read · Use the free Heart Rate Zone Calculator to calculate your 5 training heart-rate zones using the Karvonen method with your resting heart rate.Due Date Calculator: Estimate a pregnancy due date from the last menstrual periodOctober 1, 2026 · 3 min read · Use the free Due Date Calculator to estimate a pregnancy due date from the last menstrual period.Calories Burned Calculator: Estimate calories burned for dozens of activities using MET values, your weight and durationOctober 1, 2026 · 3 min read · Use the free Calories Burned Calculator to estimate calories burned for dozens of activities using MET values, your weight and duration.Calorie Calculator: Estimate daily calorie needs for maintenance, loss, or gainOctober 1, 2026 · 3 min read · Use the free Calorie Calculator to estimate daily calorie needs for maintenance, loss, or gain.Body Surface Area Calculator: Compute body surface area with the Mosteller and Du Bois formulas side by sideOctober 1, 2026 · 4 min read · Use the free Body Surface Area Calculator to compute body surface area with the Mosteller and Du Bois formulas side by side.Body Fat Calculator: Estimate body fat percentage using the US Navy method measurementsOctober 1, 2026 · 3 min read · Use the free Body Fat Calculator to estimate body fat percentage using the US Navy method measurements.BMR Calculator: Calculate Basal Metabolic Rate to estimate resting calorie burnOctober 1, 2026 · 3 min read · Use the free BMR Calculator to calculate Basal Metabolic Rate to estimate resting calorie burn.BMI Calculator: Calculate Body Mass Index from height and weight in metric or imperial unitsOctober 1, 2026 · 3 min read · Use the free BMI Calculator to calculate Body Mass Index from height and weight in metric or imperial units.Blood Alcohol (BAC) Calculator: Estimate blood alcohol concentration with the Widmark formula and a time-to-sober estimateOctober 1, 2026 · 3 min read · Use the free Blood Alcohol (BAC) Calculator to estimate blood alcohol concentration with the Widmark formula and a time-to-sober estimate.

How to use 542+ tools on this site

Each tool is a separate page. The title is the task, the sentence under the title is the scope, and the form is the product. Type the text, choose the file, or enter the numbers you already have. The result stays on that page. You can change one field and compare a second case without starting over.

480 tools run in the browser. The file or the figures stay on your device, which is why those pages are marked private. They work without an account. AI writers and handwriting OCR send the input to a server so a model can run, and the page says so. The free plan includes a small daily limit for those server tools. Pro removes the limit. Do not paste passwords or account numbers into a server tool.

Search from the header when you know the tool name. Open a category when you only know the kind of job. Calculator pages are estimates: a payment, a yard of concrete, or a calorie figure is only as good as the rate, the unit, and the date you typed. PDF and image pages follow the file you upload. If the page never mentions a rule that applies to your bank, school, clinic, or city, treat the output as a draft and check the source that actually governs the decision.

Read the notes under the form before you rely on a number. They repeat the scope, the steps, and the questions people ask. Related tools sit at the bottom when the next step is a different calculation or a different file. The categories below are the whole library.

AI-Powered Tools. AI assistants for developers and job seekers — explain code, generate SQL, write cover letters and interview answers, check résumés for ATS, debug errors, commits, PRs, docs and tests. AI assistants for developers & job seekers. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Handwriting OCR. AI-powered handwriting tools — OCR in 30+ languages, form & table extractors, math to LaTeX, Markdown conversion, and note summarizers. Upload a photo and get editable digital text. OCR, forms, tables, math & notes. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Freelancer Tools. Free client-side tools for freelancers — contracts, proposals, NDAs, rate calculators, quotes, and change orders. No signup, no subscription. Contracts, rates & client docs — free. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

DevOps Tools. Client-side generators and validators for infrastructure, CI/CD and networking — configs, manifests and scripts you can copy straight into your project. Configs, manifests & scripts. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Health & Fitness. Free health and fitness calculators — hydration, macros, heart-rate zones, training and more. Instant, private and running entirely in your browser. Fitness, nutrition & wellbeing. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Text Tools. Browser-based utilities for counting, converting, cleaning, and transforming text. Write, clean & transform text. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Developer Tools. Client-side coding utilities for formatting, converting, encoding and inspecting data. Format, convert & debug code. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Security & Password Tools. Privacy-first, in-browser tools for passwords, hashing, encryption and key generation. Passwords, hashing & crypto. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

PDF Tools. Browser-based tools to merge, split, convert, compress, and edit PDF files. Merge, split & convert PDFs. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Image Tools. Browser-based tools to convert, resize, compress, crop, and edit images. Resize, compress & convert images. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Color Tools. Browser-based color pickers, converters, palette and gradient generators. Pick, convert & build palettes. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Calculators. Financial, health, math, date and everyday calculators that run entirely in the browser. Finance, health & math. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Unit Converters. Instant client-side converters for length, weight, volume, temperature, and other measurement units. Convert any unit instantly. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

SEO & Web Tools. Comprehensive SEO suite — keyword research, technical audits, content optimization, rank tracking, backlinks, internal linking, schema, and AI SEO workflows. Research, audits, schema & AI SEO. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Social Media Tools. Client-side helpers for crafting, styling, and mocking up social media content and posts. Captions, fonts & mockups. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Content Creator Tools. Free browser tools for YouTubers, podcasters & social creators — video editing, script extraction, voiceovers, captions & more. No signup for browser tools; AI script studio uses daily free runs. Video editor, script studio & voiceovers. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Converters & Generators. Client-side data converters and utility generators for developers, students, and everyday users. Data converters & generators. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Home & Trade Calculators. Free home, workshop, electrical, and property calculators — BTU, AC tonnage, lumber, deck, voltage drop, refinance, rental cash flow, and more. Runs in your browser. Home, workshop, electrical & property. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Pick the tool whose description matches the input you have. If the description does not mention that input, it is the wrong page. Run the form, read the result next to the labels, and only then copy it into a document, a message, or a spreadsheet.

How to read a result

A calculator answers the question printed on the page. A mortgage page returns principal, interest, tax, and insurance when you enter those amounts. It does not know your lender’s fees, your credit score, or a rate that changes next month. Change the rate, the term, or the down payment and read the new payment next to the old one before you decide. The same habit works for a loan, a retirement contribution, a paint job, or a calorie target: one input at a time, then the line that moved.

Units are part of the answer. A length converter shows both sides of the pair you picked. A concrete page asks for feet or metres because a yard of concrete is a volume, not a length. If the label says per month, do not type a yearly figure in that box. Dates matter on age, pregnancy, countdown, and interest pages: the day you enter is the day the formula uses. Round only after you have the full figure, and keep the same rounding when you compare two cases.

File tools follow the file. A PDF merge keeps page order as you arranged the files. Split and extract keep the pages you selected. Compress makes the file smaller and can soften images inside it. Rotate, crop, watermark, and page numbers change the pages you see, not the words in a scanned image unless the page says it runs OCR. An image resizer changes pixels. A format converter changes the container. Download the result and open it before you send it. If the preview looks wrong, the source file is still on your device and you can run the tool again.

Text tools work on the text in the box. A counter reports words, characters, and sentences for that box only. Case, find-and-replace, and duplicate-line tools rewrite that box. They do not open a document on your computer until you paste. JSON, CSV, and code formatters expect valid input; an error line means the text is not in the shape the tool described. Fix the text or pick the converter that matches the format you actually have.

Search opens a list of every tool name and its one-line description. Type the job, not a slogan: mortgage, merge pdf, word counter, bmi. The match is the name and the description, so a short specific phrase finds the page faster than a long sentence. Category menus are the same library grouped by the kind of work. A tool that is not built yet is marked soon and does not pretend to calculate.

The guide under each tool is the place to check limits. It names the inputs, what the formula leaves out, and the questions people ask before they use the number. Related links are the next tool when the job continues, such as a payment after a loan amount, or a JPG after a PDF page. The blog explains one job in a longer article and links to the tool that does the work. Use the article when you want the reasoning, and the tool when you already have the figures.

Browser tools need a current browser and JavaScript. A very large PDF or image can be slow because it is processed on your machine. Server tools need a connection and count toward the free daily limit. Create an account only if you want that limit lifted. The result on a private page is not stored by the site. Copy what you need, then close the tab if the file was sensitive.