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Free health calculators for BMI, calories, macros, body fat, ideal weight, pregnancy due dates, fertility, sleep cycles, and heart rate zones.
Free BMI calculator with metric and US units, WHO-based adult categories, and clear medical disclaimers.
Find your daily calorie needs using the Mifflin-St Jeor equation for any goal.
Calculate your daily protein, carbs, and fat targets by goal and diet style.
Find your ideal body weight using 4 medical formulas — Robinson, Miller, Devine, and Hamwi.
Estimate body fat % using the US Navy formula or BMI-based method.
Calculate your due date from last period, conception date, or IVF transfer.
Find your fertile window and ovulation day based on your cycle length.
Calculate how much water you should drink per day based on weight, activity level, and climate.
Find the best wake-up times or bedtimes based on 90-minute sleep cycles so you wake up refreshed.
Calculate your 5 training heart rate zones from your age and resting heart rate using the Tanaka and Karvonen methods.
Estimate your 1RM from any weight and rep count using Brzycki, Epley, Lander, and Lombardi formulas.
Convert running pace to speed, calculate race finish times for 5K to marathon, and find your treadmill setting.
Calculate calories burned during any exercise using MET values and your weight.
Scale recipe ingredients for any number of servings with smart fraction display.
Calculate your daily protein needs based on body weight, activity level, and fitness goals.
Plan your intermittent fasting schedule with eating and fasting windows for 16:8, 18:6, OMAD, and more.
Track your menstrual cycle, predict your next period and ovulation date, and log symptoms.
Track your daily caffeine intake, see real-time levels using the 5.5-hour half-life formula, and find your last safe coffee time.
Localized tools for USA residents including sales tax, AQI, area codes, and cost of living comparisons.
Grow your channel with AI-powered tools for transcripts, scripts, SEO analysis, and video optimization.
Optimize your website for search engines with free meta tag generators, sitemap validators, and social preview checkers.
Essential utilities for software engineers — format JSON, generate UUIDs, and create AI-powered legal documents.
Create better content with AI detection, word counting, title generation, and case conversion utilities.
Calculate loans, compound interest, and convert currencies with real-time exchange rates and gold prices.
GPA calculators, countdown timers, and productivity tools for students and professionals.
Coin flips, dice rollers, zodiac calculators, random pickers, and more fun tools.
VAT calculators, closing cost estimators, employee cost calculators, and business name generators.
Text to binary, color code converters, character counters, and other developer utilities.
Generate QR codes and create visual assets for your projects.
Supercharge your content creation with AI-powered generators for blog outlines, email subjects, and social media captions.