YAYA JOURNAL · Yaya Blog
Turn hard problems into
steps you can follow
Practical guides for browser tools, debugging, and productivity — with clear steps, real examples, and reusable checklists.
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BMI Calculator: Chinese Adult Weight Ranges
Calculate BMI from height and weight with Chinese adult reference ranges. See the formula, worked example, healthy-weight estimate, limits, and next steps.
Standard Deviation Calculator: Which Formula?
Use a standard deviation calculator for population and sample data. Follow a worked example, compare n with n−1, and understand variance and CV limits.
Age Calculator: Years, Days, and Next Birthday
Calculate age in completed years, months, days, and total elapsed days. Learn next-birthday timing, February 29 handling, date intervals, and key limits.
Discount Calculator: Sale Price, Coupon & Tax
Calculate a sale price with percentage discounts, coupons, tax, and quantity. Follow worked examples, calculation order, coupon limits, and checkout caveats.
JSON Diff Checker: Find Changed Fields Online
Compare two JSON files online to find added, removed, and changed fields. Learn diff paths, object key and array order rules, examples, and JSON export limits.
$25 an Hour Is How Much a Year? Pay Breakdown
See how much $25 an hour is per year, month, week, and paycheck. Compare common schedules, overtime pay, unpaid time off, and gross earnings before taxes.
Calculate Overtime Pay: Formula + Examples
Learn how to calculate overtime pay from an hourly rate, regular hours, overtime hours, and a multiplier. See clear 1.5x examples and estimate gross pay.
URL Parser: Components and Query Parameters
Parse a URL into its protocol, host, domain, port, path, query parameters, and fragment. Learn decoding, repeated parameters, JSON copying, and debugging steps.
IPv4 Subnet Calculator: CIDR and Host Ranges
Calculate IPv4 subnets from an address and CIDR prefix. Learn network and broadcast addresses, usable host ranges, masks, and the special /31 and /32 rules.