Everyday Tools

Compute your Body Mass Index in metric or imperial units, with a healthy weight range and ideal weight guidanc…

Compute monthly payments and total interest for commercial, provident-fund and combined loans using equal-inst…

Four percentage questions in one place: what is B% of A, A is what percent of B, the percentage change from A …

Work out final prices, stacked discounts (store + member + coupon), whether a spend-threshold coupon beats a p…

Build a payslip item by item: base, performance pay, allowances, overtime at 1.5×/2×/3× on the statutory base,…

A real-time salary dashboard that turns your pay into a per-second figure and counts today's earnings up as yo…

Compute personal income tax with the 7-bracket progressive rates, social insurance and special additional dedu…

Convert between yearly, monthly, daily and hourly pay with configurable workdays and hours. Also computes your…

Convert amounts between Arabic numerals and Chinese financial capitals, accurate to the fen, for cheques, invo…

Convert between VAT-inclusive and exclusive amounts at 13%, 9%, 6%, 5%, 3%, 1% or a custom rate. Outputs the t…

Measure real fuel consumption with the fill-to-full method, work out trip and monthly fuel cost, and compare p…

Free online scientific calculator with trigonometry, logarithms, exponentiation, factorials and power function…

Split tips across 20 currencies with preset percentages, pre/post-tax toggles, per-person splits and rounding,…

Calculate basal metabolic rate and daily energy expenditure with Harris-Benedict, Mifflin-St Jeor and Katch-Mc…

Estimate body fat percentage using the US Navy method or the BMI method from height, weight and circumference …

Pick random winners from a list using cryptographically secure randomness, with repeat options and draw animat…

Track scores for multiple players with custom increments, decrements and live rankings — perfect for board gam…

Batch parse Chinese ID numbers (15 or 18 digits) to derive birth dates, exact ages, gender ratios and age dist…

Work out the correct Chinese kinship term from a relationship chain, covering paternal/maternal sides and seni…

Calculate social insurance and housing fund contributions with multiple city rate schemes, showing both person…

Predict possible blood types of children from the parents', or infer plausible parent combinations from a chil…

Compute credit-weighted GPA under five scales — standard 4.0, 4.3, Peking University, WES and 5-point — enteri…

Project compound growth from principal, rate, term and recurring contributions, with annual to daily compoundi…