Free Online Calculators & Tools 200+ Tools for Finance, Health & Math Finance · Health · Math · Education · AI Personal Care · 10+ Countries
Accurate, easy-to-use calculators covering financial planning, health tracking, math, education, AI personal care and more — built for users across the USA, India, UK, Canada and 10+ countries worldwide.
SitNit offers over 200 free online calculator tools across 7 major categories. Whether you need a loan EMI calculator, income tax estimator, BMI checker, or an AI face shape detector — find it all here, instantly, with no sign-up needed.
All 7 Calculator & Tool Categories
Choose a category to browse all related free calculators and tools.
Popular Financial Calculators for Loans, Tax & Investment Planning
Plan smarter with free finance tools — loans, EMI, income tax, mortgage, ROI and retirement planning.
Loan Calculator
Calculate monthly payments, total interest & full amortization for any loan.
EMI Calculator
Find your exact EMI for home, car & personal loans instantly.
Mortgage Calculator USA
Estimate monthly mortgage payments including taxes and insurance.
Federal Income Tax (USA)
Estimate your US federal income tax liability for the current year.
Income Tax Calculator India
New & old regime comparison for FY 2025-26 Indian income tax.
UK Income Tax Calculator
Estimate UK tax & National Insurance contributions for 2025-26.
Canada Income Tax 2025-26
Federal & provincial tax estimate for Canadian residents.
Retirement Calculator
See how much you need to retire comfortably at your target age.
ROI Calculator
Measure return on investment & compare investment performance.
Business Profit Calculator
Calculate gross profit, net margin & markup for your business.
Free Health & Fitness Calculators for BMI, Calories & More
Track health metrics, plan your fitness journey and stay on top of your wellness goals.
BMI Calculator
Calculate Body Mass Index and understand your healthy weight range.
BMR Calculator
Find your Basal Metabolic Rate — calories your body burns at rest.
Calorie Calculator
Get your daily calorie target for weight loss, maintenance or muscle gain.
Body Fat % Calculator
Estimate body fat percentage using simple body measurements.
Sleep Calculator
Find the ideal bedtime or wake-up time based on your sleep cycles.
Pregnancy Calculator
Calculate your due date, week-by-week milestones and trimester dates.
Calories Burned Calculator
Discover calories burned during workouts and physical activities.
Free Financial Calculators by Country — Tax, Loan & More
Tax rules and financial systems vary by country. Pick your country for locally accurate results.
USA Financial Calculators
Federal tax, mortgage, retirement
India Financial Calculators
Income tax, EMI, investment tools
UK Tax Calculator
Income tax + National Insurance
Canada Tax Calculator
Federal + provincial 2025-26
AI Personal Care Tools — Face Shape, Skin Tone & More
Discover your face shape, skin tone, ideal hairstyle and eyewear — all free, right in your browser using AI.
Math Calculators, Education Tools & Productivity Utilities
From scientific calculations and unit converters to CGPA converters, typing tests and image utilities.
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Browse our full library of 200+ free calculators and tools — all in one place.