Health and Nutrition
Free health and nutrition calculators for BMI, daily calories, BMR, TDEE, macros, body fat, ideal weight and water intake.
18 tools
BMI Calculator
Check your Body Mass Index and weight category in metric or imperial units.
Health and Nutrition
BMR Calculator
Estimate your Basal Metabolic Rate — calories burned at rest.
Health and Nutrition
Pregnancy Due Date Calculator
Estimate your baby’s due date, conception date and current pregnancy week from your last period.
Health and Nutrition
Calorie Calculator
Find your daily calorie target for losing, maintaining or gaining weight, plus a macro split.
Health and Nutrition
Sleep Calculator
Find the best times to sleep or wake based on 90-minute sleep cycles.
Health and Nutrition
Ovulation Calculator
Estimate your ovulation date and most fertile days from your last period.
Health and Nutrition
Water Intake Calculator
Estimate how much water to drink each day from your weight and activity.
Health and Nutrition
Pregnancy Weight Gain Calculator
See the recommended weight gain in pregnancy for your pre-pregnancy BMI.
Health and Nutrition
Blood Alcohol (BAC) Calculator
Estimate your blood alcohol content from drinks, weight and time.
Health and Nutrition
Macro Calculator
Split your daily calories into protein, carbs and fat.
Health and Nutrition
Protein Intake Calculator
Find your recommended daily protein from your weight and goal.
Health and Nutrition
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and health-risk band.
Health and Nutrition
Lean Body Mass Calculator
Estimate your lean body mass and fat mass using the Boer formula.
Health and Nutrition
Body Surface Area Calculator
Calculate body surface area (BSA) using the Mosteller or Du Bois formula.
Health and Nutrition
Blood Pressure Calculator
Classify a blood-pressure reading and find the mean arterial pressure.
Health and Nutrition
GFR Calculator
Estimate kidney function (eGFR) from serum creatinine with CKD-EPI 2021.
Health and Nutrition
A1C Calculator
Convert between A1C and estimated average glucose (eAG).
Health and Nutrition
Blood Type Calculator
Work out which blood types a child can inherit from both parents.
Health and Nutrition
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Finance and Loans
Free finance and loan calculators — work out EMI, monthly payments, simple and compound interest, amortization and the true cost of borrowing.
24 tools
Investment
Plan your investments with free calculators for SIP, compound growth, ROI, CAGR, retirement, savings goals and long-term wealth building.
21 tools
Business and Ecommerce
Free business and ecommerce calculators for profit margin, markup, break-even, ROAS, CPM, conversion rate, AOV and unit pricing.
33 tools
Real Estate
Free real estate calculators for mortgage payments, home affordability, down payment, rent vs buy, rental yield and cap rate.
14 tools
Insurance
Free insurance calculators to estimate life cover, term premiums, human life value, health insurance costs and claim amounts.
5 tools
Fitness
Free fitness calculators for calories burned, one-rep max, running pace, TDEE, body fat and training targets — fast and private.
12 tools
Mathematics
Free math calculators for percentages, fractions, averages, statistics, ratios, combinations, scientific notation and more.
39 tools
Education
Free education calculators for GPA, grades, study time and exam scores to help students plan and track their progress.
5 tools
Date and Time
Free date and time tools to calculate age, durations, days between dates, business days, the day of the week and time zones.
16 tools
Unit Converters
Free unit converters for length, weight, temperature, speed, area, volume, power, time and currency — see every unit at once.
16 tools
Text and Writing
Free text tools to count words, change case, remove duplicates, find and replace, check readability and clean up your writing.
26 tools
Developer Tools
Free developer tools to format, minify, validate and encode — JSON, CSS, regex, base64, JWT, hashes, cron and HTML utilities.
57 tools
SEO and Website Tools
Free SEO and website tools to generate meta tags, Open Graph, Twitter cards, FAQ schema, robots.txt, slugs and SERP previews.
15 tools
Image Tools
Free image tools to compress, resize, crop, convert and extract colours — all processed privately in your browser, no uploads.
22 tools
PDF and File Tools
Free PDF and file tools to merge PDFs, split pages and convert documents right in your browser — private, with nothing uploaded.
12 tools
Security and Privacy
Free security and privacy tools to generate strong passwords and passphrases, hash text, check password strength and validate cards.
9 tools
Travel and Vehicle
Free travel and vehicle calculators for fuel cost, fuel economy, trip distance, speed and time, and auto loan payments.
9 tools
Random Generators
Free random generators — numbers, dice rolls, coin flips, name pickers, colours, passwords and UUIDs, all quick, fair and private.
8 tools
Productivity
Free productivity tools including a Pomodoro timer, stopwatch, countdown, QR code generator and everyday helpers to save you time.
26 tools
Science and Engineering
Free science and engineering calculators for Ohm's law, force, density, energy, pressure, resistor colour codes and conversions.
27 tools