Free Online Tools & Calculators
700+ calculators & tools and 1000+ reference guides — no sign-up, instant results, and everything runs privately in your browser.
790 tools · 1,019 guides · 24 categories · 100% free · no sign-up
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Popular tools
Convert between Celsius, Fahrenheit and Kelvin instantly. Enter any temperature to see all three scales, plus the C to F formula, worked examples and a reference chart from −40°C to 100°C.
Find your exact chronological age in years, months and days from your date of birth — plus your age in total months, weeks, days and the countdown to your next birthday. Calculate age on any past or future date, with leap years and month-borrowing handled automatically.
Project your dividend income and portfolio growth with reinvestment (DRIP), annual contributions and dividend growth. See your final balance, total dividends and yearly income, and work out how much to invest to earn a target monthly income.
Enter a list of numbers to instantly find the mean, median, mode, range, sum, count and population standard deviation — with each statistic explained and worked examples.
Add, subtract, multiply and divide mixed numbers and fractions — with the answer simplified and shown as a fraction, mixed number and decimal. Includes worked examples, a common-denominator method and GCD reducing.
Calculate a percentage of a number, find what percent one number is of another, or work out the percentage change (increase or decrease) between two values — instantly, with worked examples.
Find the square root of any number as an exact decimal, and simplify whole-number radicals into the form a√b — with every step shown. Includes a perfect-squares chart and worked examples.
Recently added
Free 13th month pay calculator for the Philippines: enter your monthly basic salary and months worked to compute your mandatory PD 851 year-end pay.
Play the 21 Questions game with a fresh, randomized list. Deep, fun and flirty get-to-know-you questions for couples, friends, dates and texting. Free generator.
Play 2 Truths and a Lie with idea prompts and ready-made example sets. Generate statements to fool friends at parties, work and icebreakers. Free game tool.
Explore the famous 36 questions to fall in love. Draw a random question or work through all three sets to build closeness, connection and trust. Free tool.
Split your take-home pay with the 50/30/20 rule. Enter your monthly income to see how much goes to needs, wants, and savings with this free budget calculator.
Check the 3x rent rule fast: find the income you need to qualify for a rent, or the maximum rent you can afford on your income. Two modes, instant results.
Popular guides
In-depth reference guides — tattoo & name meanings, and how to say common phrases in other languages.
Fast & accurate
Instant, precise results — every formula is tested.
Private by design
Everything runs in your browser. Nothing is uploaded.
Free forever
No accounts, no paywalls, no limits.
What is Toolzent?
Toolzent is a free online toolbox of 790+ calculators and utilities for everyday maths, money, health, unit conversion, writing and developer tasks. Every tool runs instantly in your browser — there is nothing to install, no account to create, and the values you enter never leave your device.
What can you do with Toolzent?
Toolzent replaces dozens of single-purpose websites with one fast hub. The 790+ tools are organised into 24 categories, including:
- Finance & investing — dividends, interest, loan and savings math.
- Math & algebra and statistics — solved step by step.
- Health and fitness — clinical and everyday calculators.
- Unit converters — length, weight, temperature and volume.
- Text, generators and developer utilities.
How do you use a tool on Toolzent?
Using any tool takes three steps:
- Find it — search from the top bar (press /) or browse by category.
- Enter your values — type your numbers or text into the tool.
- Get an instant result — the answer appears immediately, with the formula and a worked example shown below it.
Are the results accurate?
Yes. Each calculator uses the standard, documented formula for its task, and every tool page shows that formula plus a worked example so you can check the result yourself. The tools are for general information and education — for medical, legal, financial or tax decisions, always confirm with a qualified professional.
Is Toolzent free, and how is it funded?
Toolzent is completely free to use, with no login and no limits. The site is supported by unobtrusive display advertising, which lets us keep every tool free, fast and private.
Frequently asked questions
Are all Toolzent tools free?+
Yes. Every tool and calculator on Toolzent is 100% free with no usage limits and no trial.
Do I need to create an account or sign up?+
No sign-up is required. Open any tool and start using it instantly.
Is my data private?+
Yes. Tools run entirely in your browser — the numbers and text you enter are never uploaded to a server.
Do the tools work on mobile?+
Yes. Every tool is fully responsive and works on phones, tablets and desktops.
Are Toolzent tools accurate?+
Yes. Each tool uses the standard, documented formula for its task, and shows that formula with a worked example so you can verify the result yourself.
Do I need to install anything?+
No. Toolzent is a website — every tool works directly in your browser with nothing to download or install.
Can I use Toolzent tools for work or school?+
Yes. The tools are free for personal, educational and commercial use. For important financial, medical, legal or tax decisions, confirm the result with a qualified professional.
How often are new tools added?+
New tools are published regularly. Check the “Recently added” section on the homepage to see the latest.