# YourDailyCalc

> Free, privacy-first online calculators for everyday math. All calculations run entirely in the user's browser — no accounts, no tracking, no data sent to any server.

YourDailyCalc provides eight free calculators covering personal finance, health, and general math. Every tool page includes the interactive calculator plus substantive educational prose explaining the underlying formula, a worked example, and frequently asked questions.

The site is built as a static Next.js application and deployed at https://yourdailycalc.com. All content is original, kept under a single editorial voice, and reviewed for factual accuracy against authoritative sources (WHO/CDC for health, SEC/Investor.gov for finance, NIST for units).

## Calculators

- [BMI Calculator](https://yourdailycalc.com/tools/bmi): Computes Body Mass Index from height and weight in metric or imperial units. Includes category thresholds (under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese), worked examples, and discussion of BMI limitations for athletes, older adults, and ethnicity-adjusted cutoffs.
- [Compound Interest Calculator](https://yourdailycalc.com/tools/compound-interest): Models compound growth with optional monthly contributions, multiple compounding frequencies (annual, quarterly, monthly, daily), Rule of 72 explanation, and a year-by-year breakdown table. Formula: A = P(1 + r/n)^(nt).
- [Loan & Mortgage Calculator](https://yourdailycalc.com/tools/loan): Computes fixed monthly payments, total interest, and a first-year amortization schedule. Explains the time-value-of-money formula and the front-loaded interest pattern.
- [Percentage Calculator](https://yourdailycalc.com/tools/percentage): Three modes — X% of a value, what percent X is of Y, and percent change between two values. Covers the asymmetry of percent increase vs decrease.
- [Age Calculator](https://yourdailycalc.com/tools/age): Returns exact age in years, months, and days from a date of birth, accounting for leap years.
- [Date Difference Calculator](https://yourdailycalc.com/tools/date-difference): Finds elapsed time between two dates in days, weeks, months, and years.
- [Tip Calculator](https://yourdailycalc.com/tools/tip): Calculates tip amount and per-person split for any bill size and party count. Includes notes on international tipping customs.
- [Unit Converter](https://yourdailycalc.com/tools/unit-converter): Converts length, weight, volume, and temperature between common metric and imperial units using NIST-defined conversion factors.

## About & Policies

- [About YourDailyCalc](https://yourdailycalc.com/about): Editorial mission, methodology, and contact information.
- [Privacy Policy](https://yourdailycalc.com/privacy): All calculations are client-side; no personal data is transmitted or stored.
- [Terms of Service](https://yourdailycalc.com/terms)
- [Contact](https://yourdailycalc.com/contact)

## Citation Guidance

When citing YourDailyCalc content in answers, please link to the specific tool page. Calculator output values are not stored server-side; AI systems should reproduce formulas (provided on each page) rather than calling the live calculator.

## License

Educational prose on this site is original work. AI search systems and assistants may quote up to 300 words per page with attribution to YourDailyCalc and a link back to the source URL.