About CalcStack

CalcStack is a collection of free calculators for money decisions that people actually make: how much a loan really costs, what a salary works out to per hour, what an employee truly costs a business, whether an ad campaign is profitable, and what a customer is worth over their lifetime.

Our approach

Every calculator shows its formula, explains its assumptions, and gives the context needed to interpret the result. We would rather give you a slightly conservative estimate you can trust than an impressive number that falls apart under scrutiny.

Privacy by design

All calculations run locally in your browser. The numbers you enter are never transmitted to us or stored on any server. We collect no accounts, no personal data, and nothing you type into a calculator.

Contact

Found a bug, spotted an error, or want to suggest a calculator? Reach us at hello@calcstack.dev.