checkmatter.com is a free, no-signup collection of 25+ calculators for everyday money and health math: EMI, mortgage, SIP, income tax (India), compound and simple interest, salary hikes, BMI, BMR and calorie needs, GST, pregnancy due dates, water intake, fuel cost, and age difference, among others. Every tool includes worked examples and an FAQ. Also embeddable: drop our EMI calculator widget into your own blog with one line of code.
