# Calculators & Converters > Free online calculators and converters: age, BMI, percentage, password generator, unit and area converters, and more. Fast, private, and browser-based. - **Category page:** https://www.toolnova.org/utilities - **Tools:** 21 - **Price:** Free · No signup · Browser-based ## Tools in this category - [Password Generator](https://www.toolnova.org/utilities/password-generator-strength-checker) — Generate strong, secure passwords, memorable passphrases, and PINs, then check password strength. Shows true entropy in bits and estimated crack time — free, local only, nothing stored. Markdown: https://www.toolnova.org/utilities/password-generator-strength-checker.md - [Percentage & Ratio Calculator](https://www.toolnova.org/utilities/percentage-ratio-calculator) — Calculate percentages five ways: what X% of Y is, what percent one number is of another, percentage change, add/subtract a percent, and multi-part ratio splits — with formulas shown, free, in your browser. Markdown: https://www.toolnova.org/utilities/percentage-ratio-calculator.md - [BMI Calculator](https://www.toolnova.org/utilities/bmi-calculator) — Calculate your Body Mass Index (BMI) in metric or imperial units with a live category gauge, healthy weight range, weight-to-goal, ideal-weight formulas, BMR, and waist-to-height risk — free. Markdown: https://www.toolnova.org/utilities/bmi-calculator.md - [Age Calculator](https://www.toolnova.org/utilities/age-calculator) — Calculate your exact age in years, months, and days, plus totals in weeks, days, hours, minutes, and live seconds. See the weekday you were born, your zodiac signs, and a countdown to your next birthday. Markdown: https://www.toolnova.org/utilities/age-calculator.md - [Time Zone Converter](https://www.toolnova.org/utilities/time-zone-converter) — Convert a chosen time across many cities at once with UTC offsets, day/night, and a meeting-overlap planner — or run it live. Daylight saving is handled automatically. Free, real-time. Markdown: https://www.toolnova.org/utilities/time-zone-converter.md - [Area Converter](https://www.toolnova.org/utilities/area-converter) — Convert between area units — square feet, square meters, square yards, acres, hectares, and South Asian land units like Marla and Kanal — with every unit shown at once. Free, instant. Markdown: https://www.toolnova.org/utilities/area-converter.md - [Length Converter](https://www.toolnova.org/utilities/length-converter) — Convert length units between centimeters, inches, feet, meters, kilometers, miles, yards, nautical miles, and more — every unit shown at once. Free, instant, high-precision. Markdown: https://www.toolnova.org/utilities/length-converter.md - [Weight & Mass Converter](https://www.toolnova.org/utilities/mass-converter) — Convert between kilograms, pounds, ounces, grams, stones, tonnes, and US tons — every unit shown at once. Free, instant weight & mass converter for cooking, fitness, shipping, and science. Markdown: https://www.toolnova.org/utilities/mass-converter.md - [Temperature Converter](https://www.toolnova.org/utilities/temp-converter) — Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine instantly — all scales shown at once. Free online temperature converter for cooking, science, and weather. Markdown: https://www.toolnova.org/utilities/temp-converter.md - [Pixel to Inches Calculator](https://www.toolnova.org/utilities/pixel-to-inches-calculator) — Convert pixels to inches, cm, mm, points, picas, and rem based on your DPI/PPI and root font size — every unit shown at once. Essential for print sizing, web design, and CSS typography. Markdown: https://www.toolnova.org/utilities/pixel-to-inches-calculator.md - [TDEE & Macro Calculator](https://www.toolnova.org/utilities/tdee-calorie-macro-calculator) — Calculate your TDEE, maintenance calories, and daily macros for weight loss, muscle gain, or maintenance. Uses Mifflin-St Jeor (or Katch-McArdle with body fat), projects weekly weight change, and sets a water target — free, private, local-only. Markdown: https://www.toolnova.org/utilities/tdee-calorie-macro-calculator.md - [Final Grade Calculator](https://www.toolnova.org/utilities/final-grade-calculator) — Find exactly what score you need on your final to hit your target grade, or add up weighted categories to see your current grade and letter — free, instant, and private. Markdown: https://www.toolnova.org/utilities/final-grade-calculator.md - [Material Calculator](https://www.toolnova.org/utilities/material-calculator-concrete-gravel-mulch) — Calculate how much concrete, gravel, mulch, topsoil, or sand you need for rectangular or circular areas — with volume, weight, bags, waste allowance, and total cost. Free and local. Markdown: https://www.toolnova.org/utilities/material-calculator-concrete-gravel-mulch.md - [Electricity Cost Calculator](https://www.toolnova.org/utilities/electricity-cost-calculator) — Calculate how much any appliance costs to run — per day, month, and year. Enter the wattage, hours of use, and your electricity rate to see the true cost. Free and private. Markdown: https://www.toolnova.org/utilities/electricity-cost-calculator.md - [Fuel & Trip Cost Calculator](https://www.toolnova.org/utilities/fuel-trip-cost-calculator) — Estimate the fuel cost of any trip. Enter the distance, your vehicle's fuel economy, and fuel price to see total cost — split it between passengers and add a return leg. Free and local. Markdown: https://www.toolnova.org/utilities/fuel-trip-cost-calculator.md - [Love Calculator](https://www.toolnova.org/utilities/love-calculator) — Free love calculator. Enter two names for a fun compatibility percentage, FLAMES result, sub-score bars, and optional zodiac star-sign compatibility — just for fun, runs instantly in your browser. Markdown: https://www.toolnova.org/utilities/love-calculator.md - [Discount Calculator](https://www.toolnova.org/utilities/discount-calculator) — Free discount calculator. Enter a price and discount to see the final sale price and savings, with optional stacked coupon and sales tax. Instant, no signup. Markdown: https://www.toolnova.org/utilities/discount-calculator.md - [Days Between Dates Calculator](https://www.toolnova.org/utilities/days-between-dates) — Free days between dates calculator. Find the exact days, weeks, months, years and business days between two dates, with an option to include the end date. Markdown: https://www.toolnova.org/utilities/days-between-dates.md - [Tip Calculator](https://www.toolnova.org/utilities/tip-calculator) — Free tip calculator. Work out the tip and total for a bill, split it between any number of people, with quick tip presets and a round-up option. Instant, no signup. Markdown: https://www.toolnova.org/utilities/tip-calculator.md - [Dice Roller & Coin Flipper](https://www.toolnova.org/utilities/dice-roller-coin-flipper) — Roll 1–12 dice (d4–d100, custom sides) with D&D notation, advantage, and exploding dice. Flip up to 100 coins at once — instant, fair, private, no download. Markdown: https://www.toolnova.org/utilities/dice-roller-coin-flipper.md - [Advanced Date Converter – Shamsi, Islamic, Julian & Gregorian](https://www.toolnova.org/utilities/advanced-date-converter) — Free advanced date converter. Convert instantly between Shamsi (Persian), Islamic (Hijri), Gregorian (Miladi), Julian Day Number and the Julian calendar — with date math, day difference, leap-year flags and copy-to-clipboard. Private, no signup. Markdown: https://www.toolnova.org/utilities/advanced-date-converter.md ## FAQ ### What units does the Area Converter support? We support standard metric/imperial units along with regional land measurements like Gaz, Marla, and Kanal. ### Is the Loan Architect Pro suitable for mortgages? Yes, it provides full amortization streams, tax insights, and prepayment simulations suitable for any long-term debt. ### How accurate is the Global Currency Converter? Our rates are refreshed every minute via high-fidelity forex and crypto market data feeds. ### Does the Password Generator store generated passwords? Never. All password generation uses cryptographically secure randomness (window.crypto.getRandomValues) and operates entirely in memory. Generated passwords are erased when you close the page — nothing is logged, stored, or transmitted. ### How does the Electricity Cost Calculator estimate running costs? It uses the formula: (Watts × Hours used per day ÷ 1000) × Cost per kWh = Daily Cost, then projects monthly and yearly. The tool includes common appliance wattage presets (AC units, heaters, refrigerators, gaming PCs) so you don't need to look up power ratings manually. ### Can I use the Material Calculator for professional construction estimates? It provides accurate volume, weight, and bag-count estimates using standard material densities. For professional construction projects, treat the results as a planning guide and add 5-10% for compaction and waste. The tool supports both imperial (ft/in, cubic yards, tons) and metric (m/cm, cubic meters) for international projects. --- ToolNova — https://www.toolnova.org · See https://www.toolnova.org/llms.txt for the full directory.