Free Calculators Online

Quick answers to everyday number questions. Check your body mass index, work out your daily calorie needs, find your exact age, plan a loan repayment or convert a currency, all in seconds and all free.

The tools

BMI Calculator

Check your body mass index and healthy weight range from your height and weight.

BMR Calculator

Work out your basal metabolic rate and daily calorie needs with the Mifflin St Jeor formula.

Age Calculator

Find your exact age in years, months and days from your date of birth.

Loan Calculator

Calculate EMI, total interest and a full repayment schedule for any loan.

Currency Converter

Convert between more than 150 world currencies with live exchange rates.

SIP Calculator

Project the growth of monthly SIP investments with expected returns, free.

Percentage Calculator

Find X percent of Y, what percent one number is of another, and percent change instantly.

Compound Interest Calculator

See how savings grow with compounding interest over years, with a clear breakdown.

GST Calculator

Add or remove GST from any amount with CGST and SGST breakup, free.

How to choose the right tool

Health calculators sit at the top because BMI and BMR work best together: BMI shows where your weight stands today, and BMR shows the calories your body burns at rest. For money questions, convert the currency first, then calculate the loan.

Frequently Asked Questions

Are these calculators accurate?

Each calculator uses the standard formula for its job, like the Mifflin St Jeor equation for BMR. Results are estimates for planning, not medical or financial advice.

Do I need an account to use a calculator?

No. Every calculator on BotixTech is free and works instantly with no signup.

What is the difference between BMI and BMR?

BMI compares your weight to your height. BMR estimates how many calories your body burns at rest each day. Used together they give a fuller picture of your health numbers.