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Trusted calculators for health, finance, and everyday math.
Fast, accurate, and beautifully simple.
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Featured Tools
Our most-used calculators — ready in one click
Age Calculator
Calculate your exact age in years, months, and days from your birthdate.
Mortgage Calculator
Calculate your monthly mortgage payment, total interest, and full loan cost. Supports optional property tax and shows a principal vs interest breakdown.
Unit Converter
Convert between length, weight, temperature, area, volume, and speed units instantly. Includes a full conversion table for every supported unit.
Tip & Bill Splitter
Calculate the perfect tip and split the bill among any number of people. Supports quick tip buttons (10–25%) or any custom percentage.
BMI Calculator
Calculate your Body Mass Index and see your weight category instantly.
Calorie & TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and get personalised calorie targets for weight loss, maintenance, or muscle gain using the Mifflin–St Jeor equation.
Why CalkHub?
Instant Results
All calculations run locally in your browser. No wait, no reload.
100% Private
Your data never leaves your device. No tracking, no accounts.
Works Everywhere
Responsive design works perfectly on phones, tablets and desktops.