Guides
Practical explainers for Wivrix tools — how calculations work, what to watch for, and when to double-check results.
BMI vs Body Fat Percentage — Which Tells You More?
BMI is a quick screening tool; body fat reflects composition. Learn what each number means, where BMI fails, and how to interpret both together.
Compound Interest and SIP — How Your Money Grows Over Time
Lump sums and monthly SIPs both compound, but differently. See the formulas, a worked 10-year example, and what rate and inflation assumptions hide.
How Currency Conversion Works — Rates, Spreads, and Real Cost
Exchange rates move constantly. Learn mid-market vs retail rates, how fees hide in spreads, and how to convert amounts with realistic expectations.
GST vs Sales Tax — What Is the Difference?
GST and sales tax both add to your bill, but they work differently. See how each is calculated, who pays what, and when to use a GST calculator.
MD5 vs SHA-256 — What Hash Functions Do and When to Use Them
Hashes fingerprint data but are not encryption. Learn how MD5 and SHA-256 differ, where each still fits, and why passwords need more than a hash.
How EMI Is Calculated on a Loan
Learn how equated monthly instalments are computed from principal, rate, and tenure—with a worked example you can verify in the loan EMI calculator.
JSON Formatter vs Validator — When to Use Each
Pretty-printing JSON is not the same as proving it is valid. Learn the difference, common syntax errors, and how to debug API payloads quickly in your browser.
How to Merge PDF Files Without Uploading Them
Combine PDFs in your browser without sending files to a server. Learn local merge workflows, order control, and what to check before you share.
Remove Image Backgrounds Privately in Your Browser
Cut out backgrounds without uploading photos to a cloud. Learn how local background removal works, when it shines, and how to get clean edges.
Salary to Hourly and Annual — How to Convert Pay Correctly
Convert between hourly, monthly, and annual pay without guessing. See the formulas, overtime pitfalls, and a worked example for full-time work.
Plan Meetings Across Time Zones Without the Math Headache
Scheduling across regions means DST, offsets, and calendar traps. Learn a reliable workflow and how a timezone converter keeps everyone aligned.
WCAG Color Contrast — What Designers Need to Know
Text must be readable against its background. Learn WCAG contrast ratios, AA vs AAA, large text rules, and how to test pairs before you ship.