Calculator
Free online calculators for math, finance, health, and everyday conversions.
Calculators for decisions that depend on numbers
Numbers drive decisions — how much house you can afford, what a discount actually saves you, whether an investment pays off, what your BMI says about your health. A calculator turns those questions into answers in seconds, with the formula transparent so you can see exactly how the result is derived. Chaudify's calculators are free, browser-based, and private: your numbers stay on your device.
BMI calculator takes height and weight and returns a Body Mass Index — a widely used screening number that categorizes weight relative to height. The result comes with the standard WHO categories (underweight, normal, overweight, obese) so you can place the number in context. It's a screening tool, not a diagnosis, and the calculator makes that distinction clear.
Percentage calculator handles the three most common percentage questions: what is X% of Y, what percent is X of Y, and the percentage change from one value to another. Discounts, tips, tax, commission, growth rates — all of these are percentage problems, and the calculator covers each variant with a clean input layout.
Mortgage calculator estimates monthly payments from loan amount, interest rate, and term — the three variables that drive almost every mortgage scenario. It shows the breakdown of principal and interest over time, helps you compare 15-year vs 30-year terms, and makes refinancing tradeoffs visible. Property tax and insurance are the remaining variables you'd add for a full picture, but the core payment calculation is here.
ROI calculator compares the gain from an investment to its cost, expressing the result as a percentage. Useful for business decisions (is this campaign worth the spend?), personal finance (does this renovation add more value than it costs?), and comparing two investment options on a level field.
All calculators run in your browser with no data sent to a server. Enter your numbers, get the result, and close the tab — nothing was stored. Pick the calculator from the cards above.