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Calculate. Convert. Create.

Thousands of Useful Tools. One Simple Place.

Calculators, converters, text and developer tools that give you the answer instantly — and privately, right in your browser.

238 tools in 20 categories · 42 more on the way

  • Free, no sign-up
  • Runs in your browser
  • Shows the formula

What do you want to do?

Every tool on ToolsServer helps you calculate something, convert something or create something.

  1. Calculate

    Percentages, dates, finance, health and everyday math.

    13 tools →

  2. Convert

    Length, weight, temperature, data and every other unit.

    17 tools →

  3. Create

    Passwords, random numbers, QR codes and placeholder text.

    7 tools →

Popular tools

All tools
  • Popular

    Age Calculator

    Find your exact age in years, months and days, plus total days lived and a countdown to your next birthday.

    Calculators

  • Popular

    JSON Formatter

    Format, validate and minify JSON, with the exact line and column of any error.

    Developer Tools

  • Popular

    Percentage Calculator

    Find a percentage of a number, what percent one number is of another, or the percentage change between two values.

    Calculators

  • Popular

    QR Code Generator

    Turn a link or text into a QR code and download it as SVG or PNG, with custom colors.

    Generators

  • Popular

    Unit Converter

    Convert length, weight, temperature, area, volume, speed, time, data storage, pressure and energy units instantly.

    Converters

  • Popular

    Word Counter

    Count words, characters, sentences and paragraphs as you type, with reading and speaking time.

    Text Tools

Browse by category

  • Calculators

    Percentages, dates, finance, health and everyday math — with the formula behind every answer.

    13 tools

  • Converters

    Convert length, weight, temperature, area, volume, speed, data and more.

    17 tools

  • Text Tools

    Count, clean, sort, compare and transform text — privately, in your browser.

    23 tools

  • Developer Tools

    Format, validate, encode and decode JSON, Base64, URLs, UUIDs and timestamps.

    27 tools

  • Generators

    Generate passwords, random numbers, QR codes, strings and placeholder text.

    7 tools

  • SEO Tools

    Create meta tags, Open Graph tags, robots.txt files and sitemaps.

    9 tools

  • Image Tools

    Compress, resize and convert images, and make favicons — right in your browser, with no uploads.

    10 tools

  • Finance Tools

    Loans, mortgages, savings, investing, debt payoff and budgeting — calculators for money decisions.

    27 tools

  • Health & Fitness Tools

    BMI, calories, body fat, heart rate zones, running pace and more — estimates for general information, not medical advice.

    18 tools

  • Math Tools

    Equations, primes, fractions, statistics, logarithms and more — with the working shown.

    22 tools

  • Science Tools

    Chemistry and physics calculators: molar mass, half-life, density, motion and waves.

    5 tools

  • Business Tools

    Margins, break-even, ad metrics, conversion and A/B tests, customer value, churn, payback and pricing.

    10 tools

  • Construction Tools

    Concrete, paint, tiles, bricks, roofs, stairs and gravel — material estimates for building and DIY projects.

    7 tools

  • Electrical Tools

    Ohm's law, power, voltage drop, wire gauges, resistor colour codes, LED resistors and electricity cost.

    7 tools

  • Network Tools

    Subnets, IP addresses, MAC addresses and user agents — worked out in your browser.

    4 tools

  • Security Tools

    Passwords, hashes, HMAC, encryption and 2FA codes — everything stays in your browser.

    6 tools

  • Cooking Tools

    Scale recipes, convert oven temperatures, pans and measurements, and brew better coffee.

    5 tools

  • Automotive Tools

    Fuel cost and economy, tire sizes, EV charging and engine power — for drivers and car buyers.

    5 tools

  • Design Tools

    CSS gradients, shadows and rounded corners, fluid type, aspect ratios and color scales — with live previews and ready-to-copy CSS.

    8 tools

Collections

Hand-picked tools for students, writers, website owners and more.

All collections

  • Tools for Students

    Free calculators and writing tools for homework, essays and grades.

    10 tools

  • Tools for Writers

    Count, clean up, format and compare text — for writers, editors and anyone who works with words.

    10 tools

  • Tools for Website Owners

    Meta tags, social previews, robots.txt and sitemaps — the technical basics every website needs.

    10 tools

Recently added

Coming soon

42 more tools are being built. These are next.

All upcoming tools

Looking for something else?

Browse every tool, or search from the top of this page. New tools are added regularly.

Browse all tools