Guides & data studies
Clear, no-nonsense explainers and original data studies from the team behind YouCalc’s calculators — so you understand the numbers before you run them.
Data studies
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Data study Conversions & UnitsHow the World Writes Numbers
A sourced, per-locale reference for how 57 locales write the same amount, 1,234,567.89 — decimal marks, digit-group separators, the Indian lakh grouping, Arabic-Indic digits and the SI recommendation.
57 locales · Updated July 1, 2026 -
Data study Lifestyle & EverydayThe Phantom-Power Index: what always-on devices really cost per year
Which always-on devices quietly cost the most in standby power? We rank 35 devices by their yearly standby cost and price four across countries — 2025 tariff data, source-backed reference watts.
35 devices · Updated July 1, 2026 -
Data study Health & BodyHealthy-Weight Standards Don’t Agree: The Global BMI Cut-off Reference
The line between “healthy” and “overweight” is a committee decision, and the committees disagree. This reference places 8 adult BMI standards — WHO, China, Japan, Korea and India — side by side, then computes the exact kilogram where each line falls by height. Reviewed 2026.
8 standards · Updated June 30, 2026 -
Data study Date & TimeFamous Dates Across 8 Calendars (and Why Your Hijri Age Is Higher)
9 world-famous dates — from the Moon landing to the fall of the Berlin Wall — rendered across 8 calendars, plus why a lunar Hijri age runs about a year ahead. 2026, reproducible.
9 dates · Updated June 30, 2026 -
Data study Education & GradesGlobal GPA Equivalence Table
One reproducible table for converting grades across borders: US GPA, German, French, Italian, Indian, percentage, UK honours and ECTS — with an interactive converter. The German column uses the official KMK formula; the rest are clearly marked indicative.
8 grading systems · Updated June 30, 2026 -
Data study Finance & MoneyWhere tourists actually get the most VAT back
We ran a representative purchase through 38 countries’ tax-free schemes to rank what tourists ACTUALLY pocket after operator fees — not the headline VAT rate. Australia, China and the UK hold the surprises.
38 countries · Updated May 24, 2026 -
Data study Finance & MoneyGlobal Mortgage Affordability Index
Where is a home loan most affordable? We rank 41 countries by how much of a median income a typical mortgage payment takes — computed with YouCalc’s mortgage engine from 2026 data.
41 countries · Updated May 24, 2026 -
Data study Lifestyle & EverydayAI Footprint Index
How much energy, water and CO₂ does one AI task cost? We rank 6 common AI tasks and three usage personas using YouCalc’s source-backed footprint engine — 2024 data, estimates.
6 AI tasks · Updated May 24, 2026 -
Data study Finance & MoneyRent vs Buy Crossover Index
In how many years does buying a home beat renting? We rank 41 countries by the break-even year — computed with YouCalc’s rent-vs-buy engine from 2026 Numbeo data.
41 countries · Updated May 24, 2026
How-to guides
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How to convert your CGPA or percentage for studying abroad
Education & Grades · 7 min read -
What a bell curve really does to your grade
Education & Grades · 7 min read -
How grading systems work around the world
Education & Grades · 8 min read -
How much house can I afford?
Finance & Money · 5 min read -
Should I rent or buy a home?
Finance & Money · 5 min read -
How to Pay Off Your Mortgage Early
Finance & Money · 6 min read