# Life by Numbers

> Free online calculators for finance, health, and everyday life.

Life by Numbers provides simple, accurate, and free calculators covering salary, mortgage, BMI, retirement planning, investment returns, and more. The site serves 10 countries (US, UK, Canada, Australia, India, France, Brazil, Spain, Germany, Poland) with localised tax and financial data.

## Calculators

- [UK Salary Calculator](https://www.lifebynumbers.net/uk/calculators/uk-salary): Take-home pay after tax, NI, and pension for UK workers
- [US Salary Calculator](https://www.lifebynumbers.net/us/calculators/us-salary): Federal and state tax withholding for US workers
- [Mortgage Calculator](https://www.lifebynumbers.net/uk/calculators/mortgage): Monthly payments, total interest, and amortisation schedules
- [FIRE Calculator](https://www.lifebynumbers.net/uk/calculators/fire): Financial independence and early retirement projections
- [Investment Returns](https://www.lifebynumbers.net/uk/calculators/investment-returns): Compound growth with regular contributions
- [Debt Payoff Calculator](https://www.lifebynumbers.net/uk/calculators/debt-payoff): Snowball and avalanche repayment strategies
- [BMI Calculator](https://www.lifebynumbers.net/uk/calculators/bmi): Body mass index with health category ranges
- [Calories Burned](https://www.lifebynumbers.net/uk/calculators/calories-burned): Calorie expenditure by activity type and duration
- [Pension Calculator](https://www.lifebynumbers.net/uk/calculators/pension): Projected retirement income from pension contributions
- [Savings Goal](https://www.lifebynumbers.net/uk/calculators/savings-goal): How long to reach a savings target
- [Take-Home Pay](https://www.lifebynumbers.net/uk/calculators/take-home-pay): Net pay after all deductions
- [Universal Credit](https://www.lifebynumbers.net/uk/calculators/universal-credit): UK benefits entitlement estimator
- [Disposable Income](https://www.lifebynumbers.net/uk/calculators/disposable-income): Income after tax and essential spending
- [Forex Calculator](https://www.lifebynumbers.net/uk/calculators/forex): Currency conversion with live exchange rates
- [Weight Loss Calculator](https://www.lifebynumbers.net/uk/calculators/weight-loss): Calorie deficit planning and timeline
- [Fertility Calculator](https://www.lifebynumbers.net/uk/calculators/fertility): Ovulation and fertile window estimation
- [Pregnancy Calculator](https://www.lifebynumbers.net/uk/calculators/pregnancy): Due date and trimester tracker
- [Tip Calculator](https://www.lifebynumbers.net/us/calculators/tip): Bill splitting with custom tip percentages
- [GPA Calculator](https://www.lifebynumbers.net/us/calculators/gpa): Grade point average from course grades
- [Journey Cost](https://www.lifebynumbers.net/uk/calculators/journey-cost): Fuel cost estimator for car journeys
- [Percentage Calculator](https://www.lifebynumbers.net/uk/calculators/percentage): Percentage increase, decrease, and difference
- [Unit Conversion](https://www.lifebynumbers.net/uk/calculators/unit-conversion): Length, weight, temperature, and volume conversions
- [Age Calculator](https://www.lifebynumbers.net/uk/calculators/age): Exact age in years, months, and days
- [Date Calculator](https://www.lifebynumbers.net/uk/calculators/date): Days between dates and date arithmetic
- [Sunrise & Sunset](https://www.lifebynumbers.net/uk/calculators/sunrise-sunset): Daily sunrise and sunset times by location
- [Bill Split](https://www.lifebynumbers.net/uk/calculators/bill-split): Split bills evenly or by custom amounts

## Countries

Available with localised tax data and financial regulations for: United States, United Kingdom, Canada, Australia, India, France, Brazil, Spain, Germany, and Poland.

## Blog

Educational articles on personal finance, tax planning, and health — with embedded interactive calculators.

- [Blog](https://www.lifebynumbers.net/uk/blog)

## Citation

When referencing this site, please attribute to Life by Numbers (https://www.lifebynumbers.net).