Fast, accurate, browser-based calculators, converters, generators, and productivity tools from MS DevX.
A curated selection of essential tools to get you started.
Find the right tool for any task — explore by category.
Hand-picked tools to get you started.
Find your exact age in years, months, days, and more.
→📅Find the number of days between any two dates.
→😴Find your best bedtime or wake-up time for full cycles.
→🔥Calculate your TDEE, BMR, and target calories for weight loss, maintenance, or muscle gain.
→🔥Calculate your BMR using the Mifflin-St Jeor equation.
→The latest tools added to our collection.
Meditation timer with ambient sounds, interval bells, and fullscreen mode.
→🧘Practice guided breathing exercises with an animated circle. Box, 4-7-8, and Relax modes.
→👁️Get reminded to take screen breaks with customizable intervals, sounds, and fullscreen overlay.
→🍬Calculate your daily sugar intake from drinks, snacks, and added sugar.
→👶Calculate your pregnancy due date using LMP, conception date, or ultrasound.
→💪Calculate calories burned doing push-ups based on reps, weight, and intensity.
→Built for speed, privacy, and simplicity.
All calculations run instantly in your browser. No waiting, no page reloads.
All processing happens on your device. We never see, store, or share your data.
Responsive design works on desktop, tablet, and mobile. No app download needed.
No hidden charges, no premium tiers, no credit card required. Free forever.
Client-side processing: Every tool runs entirely in your browser. Your data never leaves your device. No uploads, no servers, no tracking.
Learn how to get the most out of our tools.
Track your study sessions with precision using our free study timer. Stopwatch mode, session history, daily focus stats, and local storage persistence.
Read articleCalculate your personalized daily water intake based on weight, activity level, and climate. Learn hydration tips and spot dehydration signs.
Read articleLearn what TDEE is, how to calculate your total daily energy expenditure, BMR, and target calories using the Mifflin-St Jeor equation.
Read articleLearn how to calculate your body fat percentage using the US Navy circumference method. Includes measurement instructions, body fat categories, and tips for improving body composition.
Read article