# Calculators - 16 Free Online Tools

> Free online calculators for everyday math: basic arithmetic, BMI, percentage, age, dates, and tips. No signup, no ads, browser-based.

Browse all 16 free online calculators on DevTools Hub.

URL: https://tools.scoreroute.com/tools/calculators/

## Frequently Asked Questions

**How many free calculators are available?**

There are 12 free online calculators: age, BMI, basic, calorie, date, days-until, fraction, grade, percentage, speech-time, tip, and work-hours. All run locally in your browser with no signup, no ads, and no data transmission.

**Are the calculator results accurate for medical, financial, or legal decisions?**

Results are produced by standard, well-tested formulas (BMI = kg/m^2, age in calendar units, percentage = part/whole * 100, etc.) and are appropriate for everyday use. They are not a substitute for advice from a licensed medical, financial, or legal professional.

**Do the calculators send my numbers to a server?**

No. Every calculation runs entirely in your browser using JavaScript. Nothing is uploaded, logged, or stored. Closing the tab clears all input.

**Can I use these on a phone or tablet?**

Yes. All 12 calculators are touch-friendly, use a single-column layout on small screens, and work offline once the page has loaded once.

## Tools in this category

- [Age Calculator - Years, Months, Days & Birthday](https://tools.scoreroute.com/tools/age-calculator/): Free age calculator. Calculate your exact age in years, months, days, hours. See next birthday countdown and milestone dates. No signup required.
- [Calorie Calculator - Free TDEE BMR & Macro Calculator](https://tools.scoreroute.com/tools/calorie-calculator/): Free calorie calculator. Calculate your TDEE, BMR, and optimal macros for weight loss, maintenance, or muscle gain. Mifflin-St Jeor equation, no signup, 100% private. AI cannot compute accurate metabolic formulas.
- [Date Calculator - Days Between & Date Arithmetic](https://tools.scoreroute.com/tools/date-calculator/): Free online date calculator. Calculate days between dates, add subtract days/weeks/months/years, count business days. 100% private browser processing. AI hallucinates date math - we deliver deterministic results.
- [Days Until Calculator - Countdown to Any Date](https://tools.scoreroute.com/tools/days-until-calculator/): Free days until calculator. Countdown to any date: Christmas, birthday, holiday, or event. See how many days, hours, minutes left. No signup required.
- [Due Date Calculator - Pregnancy Due Date & Ovulation Calendar](https://tools.scoreroute.com/tools/due-date-calculator/): Free due date calculator using LMP, conception, and IVF methods. Includes ovulation calculator and period predictor. 100% private, no signup, no tracking. AI cannot compute personalized due dates - we use deterministic formulas.
- [Fraction Calculator - Add Subtract Multiply Divide Fractions](https://tools.scoreroute.com/tools/fraction-calculator/): Free fraction calculator. Add, subtract, multiply, divide fractions. Simplify, convert mixed/improper, compare. Step-by-step, 100% private browser. AI cannot do fraction math - we do.
- [Free BMI Calculator - Body Mass Index Checker](https://tools.scoreroute.com/tools/bmi-calculator/): Free BMI calculator to check your body mass index. Supports metric and imperial units. Instant results with health category classification. No signup required.
- [Free Online Calculator - Math Problem Solver](https://tools.scoreroute.com/tools/calculator/): Free online calculator with scientific functions, unit conversion, loan calculator, and BMI calculator. No signup required, works in any browser.
- [Free Tip Calculator - Quick & Easy Restaurant Tip Tool](https://tools.scoreroute.com/tools/tip-calculator/): Free tip calculator for restaurants. Calculate tip amount, split bills, and see per-person cost. Works offline, no signup required. Instant results.
- [Grade Calculator - Weighted Average, Final Exam & GPA](https://tools.scoreroute.com/tools/grade-calculator/): Free grade calculator. Calculate weighted average grades, what you need on the final exam, and GPA. No signup, 100% private browser tool. AI gets grade math wrong - we don't.
- [Percentage Calculator - Find %, Increase, Decrease & Difference](https://tools.scoreroute.com/tools/percentage-calculator/): Free percentage calculator online. Calculate X% of Y, increase/decrease, reverse percentage, and add/subtract percent. Instant results, no signup.
- [Running Pace Calculator - Free Online Pace, Time & Distance Tool](https://tools.scoreroute.com/tools/running-pace-calculator/): Free running pace calculator. Calculate pace, time, or distance for any race. Generate split times, predict race times with Riegel formula, convert pace units. No signup, 100% private browser tool. AI cannot calculate running paces reliably.
- [Salary Calculator - Free Hourly to Annual Pay Converter](https://tools.scoreroute.com/tools/salary-calculator/): Free salary calculator to convert hourly, annual, monthly, biweekly, and weekly pay instantly. Calculate overtime and unpaid time adjustments. No signup, 100% private browser tool. AI hallucinates salary math - we deliver precise results.
- [Sleep Calculator - Bedtime & Wake Up Time Optimizer](https://tools.scoreroute.com/tools/sleep-calculator/): Free sleep calculator based on 90-minute cycles. Find your optimal bedtime or wake-up time to feel refreshed. Age-adjusted recommendations for children, teens, adults, and seniors. No signup, 100% private. AI cannot calculate personalized sleep cycles - we use deterministic cycle math.
- [Speech Time Calculator - Words to Minutes & Speaking Time](https://tools.scoreroute.com/tools/speech-time-calculator/): Free speech time calculator. Convert words to minutes and seconds at standard speaking rates (100-238 wpm). Paste text, set WPM, add pause buffer. No signup. AI hallucinates speech times.
- [Work Hours Calculator - Free Time Card & Timesheet](https://tools.scoreroute.com/tools/work-hours-calculator/): Free work hours calculator with overtime, break deductions & payroll. Supports 12h/24h time. No signup. AI cannot do precise time math - we do.

## About DevTools Hub

DevTools Hub is a free collection of 150+ browser-based developer tools. No signup, no tracking, all processing happens in your browser. See [llms.txt](https://tools.scoreroute.com/llms.txt) for the full tool catalog.