Free · Fast · Accurate
Free Online Calculator
Tools for Everyone
Calculate EMI, plan your SIP, check your BMI, compute GST, and 15+ more tools — all free, no login required.
Finance Calculators
Plan your loans, taxes, and investments with ease
Health Calculators
Track your body metrics and wellness goals
Developer Tools
Handy utilities for everyday coding workflows
Image Tools
Resize, convert and encode images for free
About Calculator Apps — Free Online Calculators
Calculator Apps is a free online platform offering a wide range of calculators and tools designed to simplify everyday calculations. Whether you need to plan your home loan EMI, calculate your GST liability, check your BMI, or format a JSON string — Calculator Apps has you covered.
All our calculators are built to be fast, mobile-friendly, and require no registration. They are regularly updated to reflect the latest tax slabs, financial guidelines, and health standards.
Why Use Calculator Apps?
Our tools are designed for accuracy and simplicity. We use standard formulas and regularly verify our calculations against government guidelines and financial institutions. Every calculator page includes a detailed explanation of the formula used, so you always understand the result.
Finance Calculators Explained
Our EMI calculator uses the standard reducing-balance method: EMI = [P × R × (1+R)^N] / [(1+R)^N – 1]. The SIP calculator compounds monthly returns to show your investment growth. Our GST calculator supports all GST slabs: 5%, 12%, 18%, and 28%.
Health Calculators Explained
The BMI calculator uses the WHO formula: BMI = weight(kg) / height(m)². Calorie calculations are based on the Mifflin-St Jeor equation, the most accurate method for estimating Basal Metabolic Rate (BMR). Water intake recommendations are based on standard clinical guidelines of 35ml per kg of body weight.