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.
Mortgage Loans Amortization
Compound Interest Calculator
Model investment growth with regular contributions, inflation adjustments, and tax scenarios.
Investing Savings Growth
Percentage Calculator
Work out X% of Y, find percentage change, increase or decrease, and reverse percentages.
Percentage Math Discount

Health & Body Tools 2

BMI Calculator
Calculate your Body Mass Index and see where you fall within healthy weight ranges for your height.
BMI Weight Health
Age Calculator
Find your exact age in years, months, and days from any date — or calculate time between two dates.
Age Birthday Date

Everyday Utilities 5

Date Difference Calculator
Find the exact number of days, weeks, or months between any two dates — great for countdowns and deadlines.
Dates Countdown Calendar
Unit Converter
Convert between metric and imperial units — length, weight, temperature, volume, speed, and more.
Metric Imperial Convert
Tip Calculator
Calculate tip amounts and split the bill evenly across any number of people at any tip percentage.
Tip Restaurant Split Bill
Time Zone Converter
Convert times between any world time zones instantly — perfect for scheduling international meetings.
Time Zones World Clock UTC
QR Code Generator
Generate downloadable QR codes instantly for URLs, plain text, or Wi‑Fi credentials.
QR Code URL Wi-Fi

Productivity Tools 2

Password Generator
Generate strong, random passwords with custom length, symbols, numbers, and character rules.
Security Password Random
Word & Character Counter
Count words, characters, sentences, and paragraphs in any text — useful for essays, tweets, and bios.
Writing Words Characters