Download SmartCalc

Free on Android and iPhone. Six offline calculators and converters, plus notes, in one obsidian-dark app.

Why use SmartCalc?

Offline-first — every calculator, converter and note works without an internet connection.

Six tools, no clutter — EMI, GST/tax, age, unit and land-area calculators, plus notes, in one app.

Simple by design — enter your numbers, get a result, no accounts or setup.

Dark & light themes — a system-aware theme that matches your phone.

Enter a principal amount, annual interest rate and tenure in months to see your monthly EMI, total interest and total repayment.

Switch between Add GST and Remove GST, pick a 5%, 12%, 18% or 28% slab, and get the net amount, GST and total instantly.

Set a date of birth to see your exact age, a countdown to your next birthday, and totals in days, weeks and hours.

Convert between Length, Weight, Temperature and Volume with a dual From/To layout and a one-tap swap.

A dedicated From/To converter for land measurements — including square feet to marla — with an instant swap button.

Tag notes by category, edit them any time, and keep them stored locally — right next to the tools they relate to.