Free Online Calculators for Every Need
From financial planning to health tracking, get instant results with our privacy-focused calculators. No signup required, no data stored.
All Calculators
UK Salary Calculator
Calculate your take-home pay with UK tax, National Insurance, pension, and student loans
Mortgage Calculator
Calculate monthly payments, total costs, and amortization schedules
Savings Goal Calculator
Calculate time to reach savings goals with compound interest
Debt Payoff Calculator
Compare debt payoff strategies: avalanche vs snowball methods
Pension Calculator
Estimate your retirement pot and monthly income
Investment Returns Calculator
Calculate the potential returns on your investments with compound interest
Disposable Income Calculator
Calculate your money left after essential expenses for discretionary spending and savings
FIRE Calculator
Calculate your path to Financial Independence and Retire Early with savings projections
Inflation Calculator
Calculate the equivalent value of money over time using historical inflation data
Rent vs Buy Calculator
Compare the costs of renting versus buying a home with detailed financial analysis
Life Insurance Calculator
Calculate how much life insurance coverage you need to protect your family
Rental Property Calculator
Analyze cash flow, Cap Rate, and ROI for rental property investments
Crypto Profit Calculator
Calculate what your Bitcoin, Ethereum, or other crypto investment would be worth today
Capital Gains Tax Calculator
Calculate capital gains tax on stocks, crypto, and property sales with long-term vs short-term rates
Global Rich List
See where your income ranks globally and in your country with percentile rankings
Pet Insurance Calculator
Compare pet insurance costs vs. self-insuring with expected vet bills analysis
Home Insurance Replacement Cost Estimator
Calculate your home's replacement cost for insurance with regional construction costs and quality tiers
Time to FI Calculator
Monte Carlo simulation to estimate years to Financial Independence with probability distribution
Monte Carlo Retirement Calculator
Simulate retirement outcomes with market volatility to find your probability of success
Life Expectancy Calculator
Calculate your life expectancy based on age, lifestyle, and health factors with mortality probabilities
Tip Calculator
Calculate tips and split bills with service quality adjustments
Bill Split Calculator
Split bills evenly or by itemized costs with tip distribution
Take Home Pay Calculator
Calculate your net income after federal taxes, state taxes, FICA, and pre-tax deductions
BMI Calculator
Calculate Body Mass Index with health categories and recommendations
Pregnancy Calculator
Due date calculator with week-by-week development tracking and milestones
Calories Burned Calculator
Calculate calories burned during exercise and daily activities with 50+ activities
Fertility Calculator
Track ovulation, predict fertile windows, and optimize conception timing
Menstrual Cycle Tracker
Track periods, predict cycles, and understand your menstrual health
Age Calculator
Calculate exact age with life statistics, zodiac signs, and milestones
Date Calculator
4 calculation modes: difference, add/subtract, business days, day info
Unit Conversion Calculator
Convert length, weight, volume, temperature, area, and speed units
Sunrise/Sunset Calculator
Calculate sunrise, sunset, and twilight times for any location and date
Birthday Countdown Calculator
Calculate time until your birthday with age milestones and zodiac information
Astrology Calculator
Discover your zodiac sign, birth chart elements, and astrological profile
Percentage Calculator
4 types of percentage calculations with step-by-step results
Journey Cost Calculator
Estimate the total cost of your journey, including fuel, tolls, and other travel expenses
Why Choose LifeByNumbers?
100% Privacy Focused
No accounts, no tracking, no data storage. All calculations happen in your browser.
Lightning Fast
Instant results with no loading times. Optimized for speed on all devices.
Accurate & Reliable
Professional-grade calculations with up-to-date tax rates and formulas.