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 your Basal Metabolic Rate and daily calorie needs for optimal nutrition and fitness goals
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
Calculate your Army Combat Fitness Test (ACFT) score with our official calculator. Get detailed results for all 6 events, performance analysis, and training recommendations.
Latest Calculators
Discover our newest calculation tools. Fresh additions to help you with your latest needs.
Sleep Debt Calculator
Calculate sleep debt from weekly hours. Track accumulated deficit, recovery timeline, and get personalized recommendations to improve sleep quality and health.
PTO Accrual Calculator
Calculate PTO accrual based on company policy. Track earned vacation hours, sick leave balance, and annual entitlement with multiple accrual rates.
Mulch Calculator
Calculate mulch needed for your garden. Enter area size and depth to get coverage in cubic yards, bags required, and cost estimation for landscaping projects.
Coffee Ratio Calculator
Calculate perfect coffee ratio for pour over, French press, espresso, and drip methods. Enter coffee grams or water ml for precise brewing measurements.
Wallpaper Calculator
Calculate wallpaper rolls needed. Enter room size, roll dimensions, and pattern repeat to get accurate coverage, waste calculation, and purchasing guide.
Grass Seed Calculator
Calculate grass seed needed for your lawn. Enter area size and grass type to get seeding rates, bag quantities, and cost estimates for new lawns or overseeding.
Cross Product Calculator
Calculate cross product of two 3D vectors. Enter i, j, k components to find perpendicular vector, magnitude, direction, and unit vector with detailed steps.
Quilt Backing Calculator
Calculate quilt backing fabric requirements instantly. Get yardage needed, seam orientation, panel cutting instructions, and cost estimates for 42", 45", or 108" wide backing fabric.
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.