Free BMI Calculator

Yes. Every calculator on this page is free, with no account, no sign-up, and no usage limit. There's no premium tier hiding behind it.

No account of any kind. There's no login, no email capture, and nothing to set up — open the page and every calculator is ready to use immediately.

Yes. The whole page is built to work on a phone screen, from the BMI calculator to the tool tabs to the FAQ. Nothing here only works on desktop.

Any modern browser — Chrome, Safari, Firefox, Edge, and their mobile equivalents. It uses standard JavaScript and CSS with no plugins.

Once the page has loaded, every calculation runs locally in your browser. You'd only need a connection again to reload the page or fetch its fonts.

The mortgage and percentage calculators include 158 world currencies, covering all major and most regional currencies. If yours genuinely isn't listed, the plain number still works — just note the currency yourself.

No. Every calculation happens locally in your browser using JavaScript. Nothing you type — height, weight, income, home price — is sent to a server, stored, or logged.

No. There's no analytics tied to your inputs, and no record kept of what numbers you enter or what results you get.

Since nothing leaves your browser, entering a home price, income figure, or loan amount here carries the same exposure as doing the math in a notes app on your own device.

The page itself doesn't set cookies to track your calculator inputs. It doesn't require any consent banner because it isn't collecting personal data from what you type.

No — BMI is a screening measure, not a diagnosis. Treat the category and range as a starting point, and talk to a doctor about anything specific to your health.

Body mass index (BMI) compares your weight to your height. It's calculated as weight in kilograms divided by height in metres squared, or 703 × weight in pounds divided by height in inches squared.

For most adults, a BMI between 18.5 and 24.9 is classed as a healthy weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classed as obese.

No, the formula is the same for everyone. But because men typically carry more muscle mass, BMI can read slightly high for muscular men and doesn't fully reflect body composition for either sex.

No. BMI only uses height and weight, so it can't tell muscle from fat. A muscular, athletic person can show a high BMI despite having low body fat — treat it as a starting point, not a diagnosis.

This calculator is built for adults. Kids and teens are still growing, so their healthy range depends on age and sex and is usually read from a growth-chart percentile instead of the fixed adult categories used here.

It means your weight-to-height ratio sits above the range linked to lower health risk in most studies. It's a screening signal, not a diagnosis — a doctor can weigh in your full picture before drawing conclusions.

There's no fixed rule — many people check every few months rather than daily, since short-term water and food shifts can move the number without reflecting a real change in body fat.

Yes. Height can be entered in centimeters, feet & inches, or meters, and weight in kilograms, pounds, or stone — independently of each other.

Some people naturally think of their height in feet and inches but their weight in kilograms, or vice versa. Letting the two units move independently means you never have to convert a number in your head first.

The standard formula is M = P × r(1+r)ⁿ ÷ ((1+r)ⁿ − 1), where P is the loan amount after your down payment, r is your monthly interest rate, and n is the total number of monthly payments.

Many homeowners also pay property taxes, home insurance, and sometimes HOA dues or PMI. Toggle "Add taxes, insurance & HOA" above to see the fuller monthly total.

A bigger down payment lowers your loan amount, monthly payment and total interest, and can help you avoid PMI on conventional loans. 20% is a common benchmark, but many programs allow less.

Even a small rate change has a big effect over 15 or 30 years, since interest compounds monthly. A higher rate raises both your monthly payment and the total interest paid over the loan.

It's the schedule by which your loan is paid off. Early payments go mostly toward interest, and later payments go mostly toward principal, even though the total monthly payment doesn't change.

A 15-year term means a higher monthly payment but far less total interest and a faster payoff. A 30-year term keeps payments lower and more manageable, at the cost of more interest overall.

No. It calculates principal and interest plus any taxes, insurance and HOA you enter manually — it doesn't include lender fees, closing costs, discount points or private mortgage insurance.

A common guideline keeps total monthly housing cost at or below roughly 28% of gross monthly income, but your comfortable number also depends on other debts, savings goals and local cost of living.

Yes — the currency dropdown covers 158 currencies. Every figure on the mortgage calculator updates to show that currency's symbol.

Just the symbol. The currency selector doesn't apply a live exchange rate — it's meant for entering figures that are already in your local currency, not converting between currencies.

Divide the percentage by 100, then multiply by the number. 15% of 240 is (15 ÷ 100) × 240, which equals 36.

Divide the first number by the second, then multiply by 100. To find what percentage 36 is of 240, calculate (36 ÷ 240) × 100, which equals 15%.

Subtract the original number from the new number, divide by the original number, then multiply by 100. A positive result is an increase; a negative result is a decrease.

Percentage change measures relative movement (20 to 25 is a 25% increase), while percentage points measure the raw gap between two percentages (20% to 25% is a 5 percentage point rise).

Multiply the original price by the discount percentage divided by 100 to find the amount saved, then subtract that from the price. A 20% discount on $50 saves $10, for a final price of $40.

Yes — a negative percentage usually represents a decrease. A change from 100 to 80 is a −20% change, showing a drop rather than a gain.

Yes, it's optional. Pick a currency and, in "X% of Y" mode, the amount and result show that currency's symbol — useful for tips, discounts, or commission on a price.

Compare it against the healthy weight range shown below the BMI number — if your actual weight sits inside that range, your BMI will land in the healthy category, which is a fast way to double-check the math.

Run the calculator once, note the monthly payment and total interest, then change just the down payment and run it again. Comparing the two "Total interest" figures shows exactly what a bigger down payment saves you.

Use "X% of Y" mode with the tip percentage as X and the bill total as Y — an 18% tip on a $64 bill is 18% of 64.

Use "X is what % of Y" with the sale price as X and a trial original price as Y, and adjust Y until the result reads 100 minus the discount percentage — a couple of tries gets you there quickly.

Use the Mortgage / Percentage tabs in the "More calculators on the bench" section — no page reload, and whatever you've typed in the other calculator stays put while you're away from it.