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.
Real Interest Rate Calculator
Calculate real interest rate using the Fisher equation. See how inflation affects your investment returns and purchasing power. Compare nominal vs real returns.
Storage Cost Calculator
Calculate self-storage unit costs including monthly rent, insurance, climate control, and fees. Compare storage unit sizes and estimate total rental expenses.
Risk Premium Calculator
Calculate risk premium - the excess return above the risk-free rate. Analyze equity risk premium, calculate CAPM alpha, and evaluate investment risk compensation.
Electricity Cost Calculator
Calculate how much it costs to run any electrical appliance. Enter wattage and usage hours to see daily, monthly, and yearly electricity costs.
Gross Distribution Calculator
Calculate the gross withdrawal needed from 401(k) or IRA to receive a specific net amount after federal tax, state tax, and early withdrawal penalties.
Rent Increase Calculator
Calculate your rent increase by percentage, dollar amount, or new rent. See monthly, annual, and lease-term cost impacts.
Salvage Value Calculator
Calculate salvage value, depreciation, and book value for assets. Compare straight-line, double declining, and sum-of-years depreciation methods.
Hourly Pay Calculator
Convert salary to hourly rate instantly. Calculate hourly pay from annual, monthly, weekly, or bi-weekly wages. Includes overtime rates and pay period comparisons.
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.