Deep dives into tools,
techniques & the web.
Practical guides covering developer tools, health metrics, SEO, converters and more — written to be actually useful.
✦ AI-powered — understands natural language
The 300-Year Unbreakable Cipher That Got Broken — Vigenère, Enigma, and What Every "Unbreakable" Cipher Has in Common
Period Calculator — Predict Your Next Period, Ovulation & Fertile Window
Learn how a period calculator predicts your next period, fertile window, and ovulation date, what affects cycle regularity, and how to track your cycle accurately for planning or conception.
Traceroute Tool — Map the Network Path to Any Host & Find Latency
Learn how traceroute works, how to read hop-by-hop latency results, what * * * means, how to identify congested hops, and how to use a free online traceroute tool for network diagnostics.
WHOIS Lookup — Check Domain Registration, Ownership & Expiry Instantly
Learn what WHOIS reveals about domain ownership, registration dates, expiry, nameservers, and domain status codes — with real examples for security research, competitive analysis, and domain recovery.
Height Converter — Feet & Inches to Centimetres & Back
Learn how to convert height between feet/inches and centimetres, with a quick reference table, real examples for medical forms and clothing sizes, and a free height converter tool.
Sleep Calculator — Find the Best Bedtime & Wake Time for Your Schedule
Learn how sleep cycles work, why waking mid-cycle causes grogginess, and how to use a free sleep calculator to find optimal bedtimes and wake times for refreshed mornings.
Ideal Body Weight Calculator — Reference Estimates from Multiple Formulas
Learn how ideal body weight is calculated using the Devine, Hamwi, and Robinson formulas, what the estimates mean in practice, and their limitations for real-world weight goal setting.
Macro Calculator — Find Your Daily Protein, Carbs & Fat Targets
Learn what macronutrients are, how macro ratios differ by goal (fat loss, muscle gain, endurance), how to calculate your daily protein, carbs, and fat targets, and why macros matter beyond calories.
JSON Formatter — Pretty Print, Minify & Validate JSON Instantly
Learn how a JSON formatter works, what common JSON syntax errors look like, the difference between JSON and JavaScript objects, and how to format and validate JSON instantly with a free tool.
Fuel Economy Converter — MPG, L/100km & km/L Explained
Learn how to convert between MPG, L/100km, and km/L, why US and UK MPG differ, and how to calculate your actual fuel cost with a free fuel economy converter and real examples.
Date Calculator — Add, Subtract & Find Days Between Dates
Learn how to calculate the number of days between two dates, add or subtract days from a date, and solve everyday date math problems instantly with a free date calculator.
Date Calculator — Find Days Between Dates or Add Days Instantly
Use the free date calculator on sadiqbd.com to find the difference between two dates or add and subtract days from any date — handles leap years, month lengths, and deadlines instantly.
Compound Interest Calculator — How It Works & Real Examples
Learn how compound interest works and use our free calculator to project your savings or investment growth with real numbers, worked examples, and practical tips.
