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
Compare current auto loan with refinance scenarios to estimate monthly payment change, break-even months, and total borrowing cost impact.
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
Estimate monthly mortgage payments, amortization, and extra-payment impact using fixed-rate loan assumptions
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.
Gait Velocity Calculator
Estimate gait speed from walk distance and time, then review fall-risk context, community ambulation status, and trend-oriented mobility follow-up guidance.
Daily Interest Calculator
Calculate daily interest on savings, deposits, or loans. Support for simple and compound interest with multiple day count conventions.
Enterprise Value Calculator
Estimate enterprise value from market cap, debt, minority interest, preferred equity, and cash to support valuation comparison and M&A planning.
Balloon Loan Calculator
Estimate balloon-loan monthly payment, final maturity balloon, and total financing cost with schedule-based planning support.
Mortgage Calculator
Estimate monthly mortgage payments, amortization, and extra-payment impact using fixed-rate loan assumptions
Discount Calculator
Calculate final price, savings amount, and effective discount rate for percent-off, fixed-off, BOGO, and bulk-threshold offers.
Bounce Rate Calculator
Calculate bounce rate from single-page sessions and total sessions, then model engagement and revenue-impact scenarios for landing-page optimization planning.
RV Loan Calculator
Estimate RV loan monthly payment, total interest, payoff date, and amortization schedule with taxes, fees, trade-in, and optional extra payments.
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.