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Documentation
Calculators documentation
Everyday finance, health and maths calculators with the formula behind each result.
- 10 documented tools
- 0 downloads required
Overview
Each calculator page documents the inputs it takes, the exact formula it evaluates and a worked example you can reproduce by hand. Every number is computed in your browser as you type, so nothing you enter is sent anywhere.
All 10 calculator tools
Every tool below has its own documentation page and a link straight to the live tool.
Percentage Calculator
Fourteen percentage modes with the substituted formula shown for each answer.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
Age Calculator
Exact age in years, months and days, plus totals, milestones and the next birthday.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
BMI Calculator
Body Mass Index in metric or imperial, with the healthy weight range for your height.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
Scientific Calculator
Trigonometry, logs, factorials and statistics with a zero-eval expression parser.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
GST Calculator
Add or remove GST, with CGST, SGST and IGST split and Indian number formatting.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
EMI Calculator
Reducing-balance and flat-rate EMI with a full amortization schedule and prepayment modelling.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
Discount Calculator
Sale price, savings, successive discounts, reverse discount and offer comparison.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
SIP Calculator
Future value of a systematic investment plan, with step-up, inflation and goal modes.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
Salary Calculator
CTC to in-hand salary with New and Old regime tax, PF, professional tax and gratuity.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
Fuel Cost Calculator
Trip fuel cost, cost per kilometre, full-tank range and commute projections, with km/L, L/100 km and US or UK MPG conversions.
- Available — Live on this site right now.
- Browser Tool — Runs in the browser you are reading this in.
- No Install — Nothing to download, no extension, no account.
- Client-Side — Runs entirely on your device. No test data is uploaded.
Where to go next
Pick a tool above to read its documentation, or open the live Calculator tools page to start testing straight away. The troubleshooting hub covers the problems that come up across more than one tool.
Calculators, without installing anything
Everyday finance, health and maths calculators with the formula behind each result.