Professional Online Calculators
Comprehensive collection of free online calculators for every need. From basic arithmetic to advanced financial planning tools.
Calculator Categories
Find the perfect calculator for your needs. Browse our comprehensive collection organized by category.
Health & Medical
Health, fitness and medical calculation tools
Math & Science
Mathematical and scientific calculations
Finance & Investment
Financial planning and investment tools
Daily Life Tools
Everyday calculations and utilities
Unit Converters
Convert between different units and currencies
Business & Professional
Professional business calculation tools
Popular Calculators
Most used calculators by our users. Quick access to the tools you need most.
Auto Refinance Calculator
Calculate auto refinance savings, break-even months, and monthly payment. Compare current vs new terms and decide if refinancing is worthwhile.
Florida Paycheck Calculator
Calculate your take-home pay in Florida with no state income tax
Lead Time Calculator
Get accurate lead time calculations, reorder points, and safety stock recommendations to streamline your supply chain operations.
BMR Calculator
Calculate BMR with the Mifflin-St Jeor equation and estimate TDEE by activity level. Supports kg/lb and cm/in for practical nutrition planning.
Mortgage Calculator
Calculate monthly mortgage payments and amortization
Temperature Converter
Convert temperatures between Fahrenheit, Celsius, Kelvin, and Rankine with instant live conversion. Perfect for science, cooking, and weather.
Body Fat Calculator
Calculate body fat with US Navy method using neck, waist, and hip (women) measurements. See category, fat/lean mass, unit options, and measurement tips.
ACFT Score Calculator
Estimate a legacy ACFT-style six-event score for training review and historical comparison. Includes event-level breakdown, total score bands, and shareable input links.
Latest Calculators
Discover our newest calculation tools. Fresh additions to help you with your latest needs.
BMI Calculator
Calculate BMI using WHO standards and see your category plus ideal weight range. Enter weight and height in metric or imperial units and get clear guidance.
BMR Calculator
Calculate BMR with the Mifflin-St Jeor equation and estimate TDEE by activity level. Supports kg/lb and cm/in for practical nutrition planning.
Body Fat Calculator
Calculate body fat with US Navy method using neck, waist, and hip (women) measurements. See category, fat/lean mass, unit options, and measurement tips.
Chronological Age Calculator
Calculate exact chronological age from birth date to any target date. Get years, months, days breakdown with leap year handling and next birthday countdown.
Calorie Calculator
Estimate BMR and daily calorie needs (TDEE) with Mifflin-St Jeor and activity multipliers for maintenance, deficit, and surplus planning.
ACFT Score Calculator
Estimate a legacy ACFT-style six-event score for training review and historical comparison. Includes event-level breakdown, total score bands, and shareable input links.
MME Calculator
Calculate morphine milligram equivalents (MME) from opioid doses for educational risk screening. Includes common conversion factors and daily MME totals.
Waist to Hip Ratio Calculator
Calculate waist-to-hip ratio (WHR) with sex-specific risk context bands, measurement-quality guidance, and practical trend-tracking recommendations.
Why Choose LumoCalculator?
Professional, accurate, and easy-to-use calculators for all your needs.
100% Free
All calculators are completely free to use. No hidden fees or subscriptions.
Privacy First
Your data stays on your device. We don't store or track your calculations.
Mobile Friendly
Optimized for all devices. Use our calculators on desktop, tablet, or mobile.
Frequently Asked Questions
Got questions? We've got answers. Find quick solutions to common queries about our calculators.