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Free Online Calculators & Tools

Salary calculator, mortgage calculator, BMI calculator, GPA calculator, tip calculator & unit converter — instant, accurate results for everyone in the USA, UK & Canada. No login. No fees. Forever free.

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Free Calculators for
USA, UK & Canada

Accurate, instant online calculators — salary, mortgage, BMI, GPA, tips & unit conversion. No signup. No cost. Works on any device.

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Salary Calculator
Calculate take-home pay after federal & state tax, Social Security & Medicare. Supports all 50 US states & multiple pay periods.
● Finance
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Mortgage Calculator
Estimate monthly mortgage payments with principal, interest, property tax & insurance. Includes full amortization schedule.
● Finance
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BMI Calculator
Calculate Body Mass Index using lbs/ft (imperial) or kg/cm (metric). Shows ideal weight range & health category instantly.
● Health
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GPA Calculator
Calculate semester or cumulative GPA on the 4.0 scale. Add unlimited courses with grades & credit hours. Dean's List checker included.
● Education
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Tip Calculator
Calculate restaurant tips and split the bill among any group size. Custom tip percentages and per-person breakdown included.
● Lifestyle
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Unit Converter
Convert inches↔cm, lbs↔kg, miles↔km, °F↔°C and more. Supports length, weight, temperature, area, speed & volume.
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Age Calculator
Find your exact age in years, months, days & hours. Includes next birthday countdown and fun life stats.
● Utility
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Percentage Calculator
6 calculation modes — X% of Y, percent increase/decrease, percentage difference, and more. Instant results.
● Math
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Calorie Calculator
Calculate daily calorie needs (BMR & TDEE) by age, weight, height & activity. Goals for weight loss, maintenance & gain.
● Health
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Loan Calculator
Calculate monthly EMI, total interest & full amortization schedule for personal, car, student & business loans.
● Finance
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Date Calculator
Calculate days between dates, add or subtract days, and count working days. Perfect for deadlines & planning.
● Utility
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More Tools Coming
Currency converter, compound interest, word counter, scientific calculator & more on the way!
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Why ToolNix

Why Millions Choose
ToolNix — Free Online Tools

Fast, private, and accurate. Built for users in the USA, UK & Canada who need reliable calculators without the fluff.

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Instant Results
Real-time calculations as you type — no loading, no waiting, no page reloads. Get your answer in milliseconds.
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100% Private & Secure
All calculations run locally in your browser. Your salary, mortgage, or health data is never sent to any server.
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Accurate & Up-to-Date
Built with 2025/2026 US federal & state tax brackets, international unit standards, and WHO BMI guidelines.
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Works on Any Device
Fully responsive for mobile, tablet & desktop. Works perfectly on iPhone, Android, Mac, and Windows — no app needed.
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Zero Ads, Zero Popups
Clean, distraction-free experience. No intrusive ads, no cookie popups on tool pages, no newsletter spam.
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Free Forever
No premium plans, no credit card, no paywalls. Every tool on ToolNix is completely free — forever.

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Jump into any tool and get your answer in seconds. No signup. No nonsense.

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💰 Free Salary Calculator — USA, UK & Canada

Our free salary calculator helps you calculate your exact take-home pay after deductions. In the USA, it covers federal income tax, state taxes for all 50 states, Social Security (6.2%), and Medicare (1.45%). Supports weekly, bi-weekly, semi-monthly, and monthly pay periods. No signup needed.

🏠 Free Mortgage Calculator — Monthly Payment Estimator

Use our free mortgage calculator to estimate your monthly home loan payment. Enter your home price, down payment, interest rate, and loan term to get a full breakdown including principal, interest, property tax, and insurance. Includes a 12-month amortization schedule.

💪 Free BMI Calculator — Imperial & Metric

Our free BMI calculator works with both imperial (lbs, feet) and metric (kg, cm) units. Instantly see your Body Mass Index, weight category (underweight, normal, overweight, obese), and healthy weight range based on WHO guidelines. Used by people in USA, UK, and Canada.

🎓 Free GPA Calculator — 4.0 Scale

Calculate your GPA quickly using our free grade point average calculator. Add unlimited courses with letter grades (A+ to F) and credit hours. Calculates weighted semester GPA and cumulative GPA on the standard 4.0 scale. Perfect for US, UK, and Canadian university students.

🍽️ Free Tip Calculator — Bill Splitter

Our free tip calculator lets you calculate the perfect gratuity on any restaurant bill. Choose from preset percentages (10%, 15%, 18%, 20%, 25%) or enter a custom tip. Split the total between any number of people and see an instant per-person breakdown.

📐 Free Unit Converter — Length, Weight, Temperature

Convert any unit instantly with our free unit converter. Convert inches to cm, lbs to kg, miles to kilometers, Fahrenheit to Celsius, stone to kg, and much more. Supports length, weight, temperature, area, speed, and volume — essential for USA, UK & Canada users.