11 Free Tools — Zero Sign-Up Required

Free calculators for everything

BMI, mortgage, age, percentages, unit conversions, calories, tips, weather and more — all free, all instant, all private. No account ever needed.

🧰11free tools
🔒No sign-up ever
⚡Instant results
📱Works on all devices
🛡️100% private

All calculators & tools

Showing all 14 free tools

Health

BMI Calculator

Calculate your Body Mass Index instantly. Get your WHO weight category, ideal weight range, and a personalised health insight based on your stats.

Metric & Imperial Healthy weight range Health insight
Open calculator → Free
Date

Age Calculator

Find your exact age in years, months, days, hours and live ticking seconds. Includes next birthday countdown, zodiac sign, Chinese zodiac, and your generation.

Live ticker Zodiac sign Birthday countdown Generation
Open calculator → Free
Math

Percentage Calculator

Six modes in one: find X% of Y, what % is X of Y, percentage increase or decrease, add/subtract a %, discount calculator, and convert to decimals or fractions.

6 calculation modes Discount calculator Real-time results
Open calculator → Free
Finance

Tip Calculator

Calculate restaurant tips in seconds. Rate your service quality, set a custom tip percentage, split the bill between any number of people, and round up easily.

Bill splitter Service rating Custom tip %
Open calculator → Free
Convert

Unit Converter

Convert between 80+ units across 8 categories — length, weight, temperature, area, volume, speed, data storage and time. All conversions shown at once.

8 categories 80+ units Bidirectional
Open converter → Free
Convert

Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton and Réaumur all at once. The UI dynamically changes colour based on how hot or cold the temperature is.

7 scales Reactive colour UI Reference temps
Open converter → Free
Finance

Mortgage Calculator

Calculate your exact monthly mortgage payment including principal, interest, property tax, insurance and PMI. Full amortization schedule and extra payment savings included.

Amortization chart Extra payment calc Tax & insurance
Open calculator → Free
Finance

Loan & EMI Calculator

Calculate monthly EMI for personal, car, student or business loans. Live sliders, rate comparison across three interest rates, and a full amortization breakdown.

5 loan types Rate comparison Live sliders
Open calculator → Free
Fitness

Calorie Calculator

Find your Total Daily Energy Expenditure (TDEE) and BMR using Mifflin-St Jeor. Get exact calorie and macro targets for weight loss, maintenance or muscle gain.

TDEE & BMR Macro breakdown All activity levels
Open calculator → Free
Weather

Weather

Live weather and 7-day forecast for any city worldwide. Temperature, feels-like, humidity, wind speed, UV index, hourly forecast and sunrise/sunset times.

Live data 7-day forecast Any city worldwide
Check weather → Free
Network

Subnet Calculator

Calculate network address, broadcast address, usable host range, subnet mask, wildcard mask and full binary representation for any IPv4 address and CIDR prefix.

Binary display Subnet splitter CIDR reference table
Open calculator → Free
Math

GPA Calculator

Calculate your semester GPA or cumulative CGPA instantly. Add any number of courses with custom credit hours, letter grades, and get your classification.

Semester GPA Cumulative CGPA Target grade finder
Open calculator → Free
Math

Random Number Generator

Generate cryptographically random numbers in any range. Includes dice roller, coin flip, card draw, random list picker and shuffle. Truly random, not pseudo-random.

Any range Dice & coin List picker
Open generator → Free
Finance

Discount Calculator

Find the sale price after any percentage discount, calculate how much you save, reverse-calculate the original price, and compare two deals side by side.

% off calculator Reverse price Deal comparison
Open calculator → Free

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Why AllFreeCalculators.io?

Built to be the fastest, cleanest calculator site on the web

⚡
Instant — no waiting
All calculations run directly in your browser. No server requests, no loading spinners. Results appear the moment you type.
🔒
Completely private
Nothing you enter is ever sent to a server. No data is logged, stored, or shared with anyone. Your inputs stay on your device.
📱
Works on any device
Every tool is fully responsive and tested on mobile, tablet, and desktop. No app required — just open the page and use it.
🎯
Accurate formulas
We use WHO, Mifflin-St Jeor, standard amortization, and SI-defined conversions — the same formulas professionals trust.
🆓
Always 100% free
No premium plans, no paywalls, no feature limits, no email required. Every tool is free — today, tomorrow, forever.
🌍
Metric & Imperial
Every measurement tool supports both metric and imperial units — whether you're in the US, UK, Australia, NZ or anywhere else.

Frequently asked questions

Everything you need to know about AllFreeCalculators.io

Are all these calculators really free?
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Yes — 100% free, forever. There are no sign-ups, no accounts, no time limits, and no premium features. Every tool on AllFreeCalculators.io is completely open to use.
Do I need to create an account?
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No. Every calculator is instantly accessible with no registration, no email address, and no personal information required whatsoever.
Are the calculations accurate?
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Yes. All tools use standard, professionally accepted formulas — WHO for BMI, Mifflin-St Jeor for calories, standard amortization for mortgages, and exact SI ratios for all unit conversions.
Is my personal data safe?
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Completely. All calculations run inside your browser using JavaScript. Nothing you type is ever sent to any server, stored, or shared. Your data never leaves your device.
Do the tools work on mobile phones?
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Yes. All 11 tools are fully mobile-responsive and optimised for phones, tablets and desktops. No app download is needed — just visit the site in your browser.
How does the BMI calculator work?
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Enter your height and weight (metric or imperial) and the tool instantly calculates your BMI using the WHO formula: BMI = weight(kg) ÷ height²(m²). It then shows your weight category, ideal weight range, and a health insight.
How do I convert Celsius to Fahrenheit?
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Use our Temperature Converter tool. The formula is °F = (°C × 9/5) + 32. For quick reference: 0°C = 32°F (freezing), 37°C = 98.6°F (body temperature), 100°C = 212°F (boiling).
Will more tools be added?
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Yes — we regularly add new calculators based on what our visitors need. Check back often, or bookmark the site. We currently have 11 tools and plan to keep expanding.