checkmatter.com: Free calculators for loans, taxes, health & more

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.

Hey Product Hunt! I built checkmatter.com because I kept bouncing between five different sites just to check an EMI, convert GST, or figure out my BMI. It's a free, ad-light collection of 25+ calculators covering everyday finance (EMI, mortgage, SIP, India income tax, compound/simple interest, salary hikes) and health (BMI, BMR/calories, pregnancy due dates, water intake), plus utilities like fuel cost and age difference. No sign-up anywhere. Every calculator ships with worked examples and an FAQ so you're not just staring at a blank form. I also just added an embeddable widget version of the EMI calculator, so other sites can drop it into their own pages. Would love feedback on which calculator to build next!