MonkeyTactics
Free Online Calculators & Tools
All Tools
Every free calculator and utility on MonkeyTactics — all running privately in your browser, no sign-up required.
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Finance Tools 3
Loan & Mortgage Calculator
Calculate monthly payments, total interest paid, and view a full amortization schedule for any loan.
Compound Interest Calculator
Model investment growth with regular contributions, inflation adjustments, and tax scenarios.
Percentage Calculator
Work out X% of Y, find percentage change, increase or decrease, and reverse percentages.
Health & Body Tools 3
BMI Calculator
Calculate your Body Mass Index and see where you fall within healthy weight ranges for your height.
Calorie Calculator
Estimate your BMR, daily calorie needs (TDEE), maintenance calories, and calorie goals based on your activity level.
Age Calculator
Find your exact age in years, months, and days from any date — or calculate time between two dates.
Everyday Utilities 7
Date Difference Calculator
Find the exact number of days, weeks, or months between any two dates — great for countdowns and deadlines.
Unit Converter
Convert between metric and imperial units — length, weight, temperature, volume, speed, and more.
Tip Calculator
Calculate tip amounts and split the bill evenly across any number of people at any tip percentage.
Time Zone Converter
Convert times between any world time zones instantly — perfect for scheduling international meetings.
QR Code Generator
Generate downloadable QR codes instantly for URLs, plain text, or Wi‑Fi credentials.
QR Code Decoder
Decode QR codes privately from images, screenshots, public image URLs, or your camera.
Word Unscrambler
Find anagrams and Scrabble words by length, with tile scores and dictionary definitions.