About CheckMatter
Free Online Calculators & Practical Guides
CheckMatter helps people work through everyday finance, health, date, math, and conversion questions with useful tools and plain-language explanations.
What CheckMatter publishes
Our calculators are designed for common decisions such as estimating EMI, exploring SIP scenarios, separating GST, comparing dates, checking health measurements, and converting numbers.
Our practical guides explain the formula, assumptions, examples, limitations, and next questions behind those results. Calculators and related guides link to each other so readers can move from an answer to an explanation.
Our purpose
We aim to make routine calculations easier to understand and verify. Results should be fast, but they should also show enough context for a reader to recognize what the number means—and what it does not mean.
CheckMatter is a free information service. It does not replace professional financial, tax, legal, or medical advice.
How calculators and guides are reviewed
- Method: state the formula or calculation approach in plain language.
- Examples: test representative inputs and explain the resulting output.
- Limitations: identify assumptions, estimates, and cases that require professional confirmation.
- Sources: prefer primary government, regulator, standards-body, or recognized institutional sources where a rule or rate matters.
- Maintenance: review important tools when formulas, regulations, or authoritative guidance change.
Read our editorial policy, corrections policy, and disclaimer.
Who is behind CheckMatter
CheckMatter was founded and is maintained by Ajit Naskar, who documents calculator methods, tests tools and edge cases, and checks cited sources. CheckMatter does not present a brand label as a professional credential.
We do not publish invented ratings, testimonials, traffic totals, accuracy percentages, or awards.
Questions and corrections
If you find a calculation error, unclear assumption, outdated source, or broken link, please include the page URL, the inputs used, the expected result, and any supporting source.
About, ownership, and editorial-process information reviewed: 1 September 2026.