MonkeyTactics
Free Online Calculators & Tools
Free Online Calculators and Tools
MonkeyTactics is a growing collection of free online calculators and utilities designed to be quick, accurate, and effortless to use on any device. Everything runs directly in your browser, keeping your data private and secure.
Popular Tools
A curated selection of the tools people use most.
Age Calculator
Find your exact age in years, months, and days.
Percentage Calculator
Work out X% of Y, percent changes, and more.
BMI Calculator
Calculate your Body Mass Index and healthy weight range.
Loan & Mortgage Calculator
Monthly payments, interest, and amortization schedules.
Compound Interest Calculator
Model growth, contributions, withdrawals, inflation, taxes, and scenarios.
QR Code Generator
Create QR codes for URLs, text, or Wi‑Fi details.
Browse Tools by Category
Explore calculators grouped by what you're trying to solve.
Health & Body Tools
Everyday Utilities
Productivity Tools
About MonkeyTactics
MonkeyTactics provides simple, reliable tools that help you calculate, convert, plan, and solve everyday tasks without friction.
Privacy & Trust
Your data stays on your device. Calculations run entirely in your browser — nothing is sent to a server.