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Everyday Tools

Free browser-based utilities: calculators, unit converter, color tools, text utilities, and world clock — no signup needed

5 tools
Ink illustration for Everyday Tools: a large calculator with a grid of empty buttons and one burnt orange key
BMI Calculator

All processing happens in your browser. No data is sent to any server.

Key Features & Benefits

BMI Calculator

Calculate your Body Mass Index with instant categorization (Underweight, Normal, Overweight, Obese). Uses the standard WHO formula and provides a visual range guide so you can understand where you fall on the spectrum.

Versatile Percentage Calculator

Three percentage modes in one tool: find X% of Y, determine what percent X is of Y, and calculate the percentage change from X to Y. Handles all common percentage calculations without switching tools.

Age Calculator with Birthday Countdown

Enter your date of birth to see your exact age in years, months, and days — plus a countdown to your next birthday. Useful for age verification, milestone planning, and just for fun.

Date Difference Calculator

Find the exact duration between any two dates in years, months, days, total days, and total weeks. Perfect for project planning, contract durations, and calculating time-based milestones.

No Server, No Signup, No Limits

Every calculator runs 100% in your browser with standard mathematical formulas. No account needed, no daily limits, and your data never leaves your device. Use them as often as you need.

Smart Calculator Suite – Frequently Asked Questions

What BMI categories does the calculator use?
The BMI calculator uses the World Health Organization (WHO) standard categories: Underweight (BMI < 18.5), Normal weight (18.5 - 24.9), Overweight (25 - 29.9), and Obese (BMI ≥ 30). These are internationally recognized thresholds for adults.
Can I use the percentage calculator for business calculations?
Absolutely! The three modes cover the most common business scenarios: calculating discounts or markups (X% of Y), determining profit margins (X is ?% of Y), and measuring growth or decline (percentage change from X to Y).
Does the age calculator account for leap years?
Yes, the age calculator uses JavaScript's native Date object, which correctly handles leap years. Your age is calculated precisely, including the extra day in February during leap years.
Are there any usage limits on the calculators?
No. All calculators in the Smart Calculator Suite run entirely in your browser with no server-side processing. There are no daily limits, no account requirements, and no cost. Use them as often as you need.

Everyday Tools – Frequently Asked Questions

Common questions about the free everyday utilities in Recentech Studio.

What tools are in Everyday Tools Lab?
Everyday Tools Lab includes five browser-based utilities: Smart Calculator Suite (BMI, percentage, age, and date calculators), Unit Converter (convert between length, weight, temperature, volume, speed, area, data, and time units), Color & Gradient Studio (color picker, palette generator, and CSS gradient builder), Text Toolkit (word counter, case converter, find & replace, and text utilities), and World Clock & Timer (world times, timezone converter, stopwatch, and countdown timer).
Do Everyday Tools require an account?
No. All Everyday Tools work entirely in your browser with no server-side processing. You can use them without creating an account. No data is sent to any server — your information stays private on your device.
Are there daily usage limits?
No. Everyday Tools run 100% in your browser, so there are no daily limits or restrictions. Use them as often as you need — completely free, with no credit card or account required.
How accurate are the calculators?
The calculators use standard mathematical formulas (BMI formula, percentage calculations, and date arithmetic) and are as accurate as any dedicated calculator app. Everything is computed locally in your browser with full floating-point precision.
Can I use Everyday Tools offline?
Once the page is loaded, most Everyday Tools work without an internet connection since all processing happens in your browser. The World Clock and Time Zone Converter use your browser's built-in timezone data, so they also work offline after the page has loaded; the stopwatch and timer work fully offline.