# Fast Everyday Calculators

> Fast, mobile-friendly everyday calculators for dates, percentages, school, and planning. Every calculator runs instantly in the browser.

Canonical: https://site-factory-demo-calculator-hub.pages.dev/
Template: calculator-hub
Locale: en
RSS: https://site-factory-demo-calculator-hub.pages.dev/feed.xml

## Live Calculators

- Age Calculator: Calculate age in years, months, days, and total days between a birth date and any target date. (https://site-factory-demo-calculator-hub.pages.dev/age-calculator/)
- Date Calculator: Add or subtract days from any date and get a clean shareable result instantly. (https://site-factory-demo-calculator-hub.pages.dev/date-calculator/)
- Time Duration Calculator: Calculate elapsed time between two clock times, including overnight ranges. (https://site-factory-demo-calculator-hub.pages.dev/time-duration-calculator/)
- Hours Calculator: Calculate net work hours from days, hours per day, and daily break time. (https://site-factory-demo-calculator-hub.pages.dev/hours-calculator/)
- Percentage Calculator: Solve percent-of, percent ratio, and percent change questions in one compact calculator. (https://site-factory-demo-calculator-hub.pages.dev/percentage-calculator/)
- Grade Calculator: Calculate a grade percentage from earned points and possible points, with a simple letter estimate. (https://site-factory-demo-calculator-hub.pages.dev/grade-calculator/)
- GPA Calculator: Calculate GPA from total grade points and total credits using a transparent weighted formula. (https://site-factory-demo-calculator-hub.pages.dev/gpa-calculator/)
- BMI Calculator: Calculate body mass index from metric or US height and weight inputs, with adult category guidance. (https://site-factory-demo-calculator-hub.pages.dev/bmi-calculator/)
- Calorie Calculator: Estimate daily calories from BMR, activity level, and a maintain, loss, or gain goal. (https://site-factory-demo-calculator-hub.pages.dev/calorie-calculator/)
- TDEE Calculator: Estimate total daily energy expenditure from BMR and activity level. (https://site-factory-demo-calculator-hub.pages.dev/tdee-calculator/)
- Auto Loan Calculator: Estimate auto loan monthly payments with tax, fees, trade-in, comparison, and amortization CSV export. (https://site-factory-demo-calculator-hub.pages.dev/auto-loan-calculator/)
- Mortgage Calculator: Estimate mortgage payments with taxes, insurance, HOA, PMI, comparison mode, and amortization CSV export. (https://site-factory-demo-calculator-hub.pages.dev/mortgage-calculator/)

## Blog

- Everyday calculators guide: How to use the first group of everyday calculators for dates, percentages, grades, and planning. (https://site-factory-demo-calculator-hub.pages.dev/blog/everyday-calculators-guide/)