Lifestyle
Everyday math, simplified. Figure out your BMI and body fat percentage, estimate mortgage payments, calculate take-home pay after tax, track scores on game night, or let the random picker decide where to eat. No sign-up required.
Lifestyle
BMI Calculator
Free online BMI calculator for body mass index, healthy weight ranges, and weight category estimates using height, weight, age, and gender inputs.
BMR Calculator
Free online BMR and TDEE calculator. Estimate basal metabolic rate, daily calorie needs, and activity-based energy expenditure.
Body Fat Calculator
Free online body fat calculator using common measurement methods. Estimate body fat percentage, lean body mass, and body composition.
Blood Type Calculator
Free online blood type inheritance calculator. Predict possible child blood types from parents or possible parent combinations from a child blood type.
Mortgage Calculator
Free online mortgage calculator. Calculate monthly payments, total interest for commercial loans, provident fund loans, and combined loans.
Income Tax Calculator
2026 China personal income tax calculator. 7-level progressive tax rates, social insurance and special deductions auto-calculation.
Social Insurance Calculator
China social insurance and housing fund calculator for pension, medical, unemployment, injury, maternity, and provident fund contributions.
Scoreboard
Free online scoreboard tool, add multiple players, custom scoring, real-time ranking. Perfect for board games, parties, sports and competitions.
Scientific Calculator
Free online scientific calculator with trigonometric functions, logarithms, exponentials, factorials, powers, and degree/radian mode
Random Selection Tool
Free online random picker tool for raffles and draws. Uses cryptographic random algorithm for fairness, with draw animation and duplicate options.
Chinese Kinship Calculator
Free online Chinese kinship title calculator. Enter a relationship chain to find the correct family title by lineage, gender, and birth order.
ID Card Age Calculator
Free online ID card age calculator. Batch parse Chinese ID numbers, calculate ages, view statistics including age distribution, gender ratio. Supports CSV export.
RMB Chinese Uppercase Converter
Free online RMB amount converter between numeric and Chinese uppercase format. Precise to fen, perfect for checks, invoices, and financial documents.
Tip Calculator
Free online tip calculator in 20 currencies. Preset percentages, pre/post-tax switch, split bill across people, round-up totals, plus country tipping etiquette.
What this category can do
Lifestyle tools are practical calculators and helpers for personal or household tasks. They include body metrics, blood type, mortgage, tax, social insurance, scoring, scientific calculation, random selection, kinship terms, ID age and RMB uppercase conversion. They provide estimates and references, not professional medical, legal or financial decisions.
Most tools process input in the browser when possible. For files, tokens, documents or network checks, review the selected tool before using sensitive data.
Common use cases
- Estimate BMI, BMR, body fat or ID-card age from personal measurements and dates.
- Calculate mortgage payments, income tax, social insurance or uppercase RMB amounts for planning.
- Keep score, run scientific calculations, choose randomly or check kinship terms in daily situations.
FAQ
Can health calculators replace medical advice?
No. BMI, BMR and body fat values are estimates and should not be used as diagnosis.
Why does payroll differ from tax results?
Local rules, bases, caps, deductions and policy updates affect actual payroll.
Is a mortgage result the same as a bank quote?
No. Banks may include fees, rate rules and repayment details not captured by a simple calculator.
How do I make random selection fair?
Enter each option once unless you intentionally want weighting. Repeated options increase the chance of selection.