About and methodology
Workings is a collection of free calculators, converters and developer tools. Its aim is simple: give you the answer immediately, show how it was worked out, and point you to the next useful tool.
What this site is for
Everyday questions — what is 15% of this, how many days until that, what will this loan really cost — shouldn’t need an account, a pop-up or a wall of text. Every tool works as soon as the page loads, and the explanation, formula and a worked example sit underneath for anyone who wants to check the method.
How results are produced
- Plain, tested code. Every result comes from a deterministic function with unit tests covering normal values, decimals, zero, boundaries, rounding and invalid input. Nothing is estimated by a language model or looked up at run time.
- Exact arithmetic where it matters. Money schedules are held in whole cents or paise so balances end at exactly zero; fractions and large counts use exact integers; dates use calendar arithmetic with no time-zone surprises (only the time-zone converter depends on your device’s time-zone data).
- One table of unit factors. All converters share one table using exact legal definitions, so two pages can’t disagree.
- Worked examples are computed, not typed. The example on each page is run through the same code when the site is built, so it can’t drift out of date.
How accuracy is handled
We state the assumptions behind each tool on its page and say so when a result is an estimate. Where a rule depends on a country, year or institution — income tax, GST, exam marking schemes, grade conversions — the tool names the rule, links its sources and shows the date it was last checked. If a rule is uncertain or conflicting sources disagree, the tool is limited to what is certain or left out; for CGPA conversion, for instance, only the CBSE multiplier is named, and your own university’s formula can be entered. We don’t guarantee that any result is error-free: please verify anything important against the official source.
Tools that depend on rules, and when they were checked
| Tool | Rule applied | Last checked |
|---|---|---|
| CGPA to Percentage Calculator | CBSE grade-point conversion multiplier of 9.5 | 3 Oct 2026 |
| Percentage to CGPA Calculator | Reverse of the CBSE grade-point conversion multiplier of 9.5 | 3 Oct 2026 |
| CTC to Take-Home Salary Calculator (India) | Income tax, new regime, individuals — FY 2026-27 (assessment year 2027-28) | 3 Oct 2026 |
| GST Calculator | GST rate structure in force from the GST Council's 56th meeting (5%, 18% and 40% main slabs) | 3 Oct 2026 |
| JEE Main Marks Calculator | JEE Main Paper 1 (B.E./B.Tech.): 75 questions, 4 marks each, −1 for a wrong multiple-choice answer | 13 Oct 2026 |
| JEE Main Percentile Calculator | NTA percentile score used for JEE Main results — computed within each session | 13 Oct 2026 |
| JEE Advanced Marks Calculator | JEE Advanced paper scoring — marks per question type are user-editable | 13 Oct 2026 |
| NEET UG Marks Calculator | NEET (UG): 180 compulsory questions, +4 correct, −1 wrong, 720 marks | 13 Oct 2026 |
| NEET Qualifying Cut-off Checker | NEET (UG) qualifying percentiles by category | 13 Oct 2026 |
| GATE Marks Calculator | GATE marking scheme: MCQ negative marking ⅓ and ⅔, none for MSQ and NAT; 100 marks | 13 Oct 2026 |
| GATE Score Calculator | GATE score formula: S = Sq + (St − Sq)(M − Mq)/(Mt − Mq), Sq = 350, St = 900 | 13 Oct 2026 |
| CAT Score Calculator | CAT 2025 pattern: 68 questions, +3 correct, −1 wrong MCQ, no negative marking for TITA, 204 marks | 13 Oct 2026 |
| CAT Percentile Calculator | Percentile as the share of candidates at or below a score — supply figures for your own test | 13 Oct 2026 |
| SSC CGL Tier 1 Score Calculator | SSC Combined Graduate Level Examination 2025 — Tier-I: 4 sections × 25 questions, 2 marks each, 0.50 negative marking | 3 Oct 2026 |
| SSC CHSL Tier 1 Score Calculator | SSC Combined Higher Secondary Level Examination 2025 — Tier-I: 4 sections × 25 questions, 2 marks each, 0.50 negative marking | 3 Oct 2026 |
| SSC MTS Score Calculator | SSC MTS (Multi-Tasking Staff) CBT 2025: two sessions, 3 marks per question, −1 per wrong answer in Session II only | 13 Oct 2026 |
| Banking Prelims Score Calculator | IBPS PO Prelims pattern: 100 questions, 1 mark each by default, one-fourth negative marking | 13 Oct 2026 |
| UPSC Prelims Score Calculator | Civil Services (Preliminary) Examination: GS Paper I 100 × 2 marks, CSAT 80 × 2.5 marks, ⅓ negative marking, CSAT qualifying at 33% | 13 Oct 2026 |
| RRB NTPC and Group D Score Calculator | RRB NTPC CBT-1 (100), CBT-2 (120) and Group D CBT (100): 1 mark per question, ⅓ negative marking | 13 Oct 2026 |
These dates change only when the rule and its sources have genuinely been re-checked.
Your data
Calculations run in your browser. What you type into a calculator isn’t sent to a server, and the developer tools process JSON, tokens, text and code entirely on your device. See the privacy policy for the details.
How the site is funded
The site is free to use. It may in future show clearly labelled advertising, affiliate links or sponsorships; none of these affect how a result is calculated. Read the advertising and affiliate disclosure.
What this site is not
It is not a source of financial, tax, legal, academic or professional advice, and it can’t see your personal circumstances. See the disclaimer.
Who runs it
Workings is run by an independent site owner. Spotted a mistake or have a suggestion? Please use the contact page — corrections are welcome.