LifeHackToolbox: fast, free everyday calculators.
LifeHackToolbox is a small set of simple tools you can use right in your browser. Everything here is free, requires no signup, and is designed to feel modern and easy to use on both phone and desktop.
- Free with no account or signup
- Modern, focused interface
- Works great on phones and laptops
Browse tools
Money & bills
Hourly to Salary Paycheck & After-Tax
Convert between hourly and salary pay and see your estimated take-home pay after taxes by state.
Mortgage Payoff & Amortization
Estimate your monthly payment, see a full payoff schedule, and explore how extra payments can reduce interest and shorten your mortgage term.
Receipt Bill Splitter
Enter receipt items, pick who ordered what (or who is sharing), and let the tool split the bill with tax and tip included. Everything runs on your device.
Rent vs Buy Calculator
Compare renting versus buying a home with full monthly cost breakdown, net worth over time, and a clear break-even year under your assumptions.
Home & everyday life
Random Meal Generator
Stuck on what to eat? Get a random meal idea filtered by diet and calories.
Smoothie Macro Calculator
Build a custom smoothie and see total calories, protein, carbs, and fat.
Paint Coverage Calculator
Estimate how many gallons of paint you need for one or more rooms, including doors, windows, ceilings, and coats.
Grass Seed Coverage Calculator
Estimate how many bags of grass seed you need. Supports top brands, new lawns, reseeding, and custom mixes.
How Long to Freeze?
Pick a food, freezer type, and frozen-on date to see how long it's recommended to keep it frozen and when quality starts to drop.
Health, fitness & family
Baby Kick Counter
Count and time baby movements in a calm, mobile-friendly tracker. Includes recent session history. Not medical advice.
Body Progress Tracker
Log your weight and measurements, see BMI and calorie estimates, and track progress toward your goals over time.
Workout Tracker
Log your strength and cardio sessions, track lifts over time, and export your training log as CSV or shareable charts.
Baby Name Generator
Explore boy, girl, and neutral names by origin and meaning, then randomize first and middle names with your last name.
Baby Genetic Predictor
Predict your baby's height, eye color, and hair color with beautiful data-driven visualizations.
Life Expectancy Explorer
Estimate your remaining years of life by age, sex, country, and lifestyle, with survival curves and risk visualizations.
School, study & classroom tools
Weighted Grade Calculator
Add class categories and weights to see your current grade as a weighted percentage.
Time Duration Calculator
Find the time between two dates or add/subtract days, hours, minutes, and seconds from a specific date and time.
Universal Unit Converter
Convert between units of length, weight, volume, temperature, speed, area, pressure, data, and more in a clean, mobile-friendly interface.
Unit Circle Calculator & Trig Explorer
Explore the unit circle with an interactive trig calculator. See angles in degrees and radians, and view sine, cosine, and tangent values with exact trig ratios.
Interactive Periodic Table
Explore all 118 elements with category filters, property maps, and detailed atomic data in a fully interactive table.
DNA Sequence Explorer
Visualize DNA sequences, codons, and amino acids with an interactive viewer and exportable charts and tables.
Solar System Orbit Simulator
Watch the planets circle the Sun in real time and tap each one to explore orbital periods, distances, and temperatures.
Team Randomizer
Split a class, roster, or group into fair random teams in seconds.
Work, docs & developer tools
Resume Builder
Create an ATS-friendly resume in your browser with no login, then export it to PDF, Word, plain text, or Markdown.
PDF Signature & Form Filler
Sign PDFs and add basic text form fields directly in your browser. No upload, fully client-side.
Email Signature Generator
Build a professional HTML email signature with your details, links, and logo, then copy the HTML or export a PNG preview.
JSON Linter & Formatter
Validate and format JSON locally, then copy or download the result with no data sent to a server.
Diff Checker
Compare two blocks of text or code, highlight additions and deletions, and download a simple diff.
QR Code Generator
Build QR codes for links, Wi‑Fi networks, and messages, customize colors, and download a PNG with optional branding.
Random Password Generator
Generate strong random passwords with custom character sets and a quick strength estimate, all in your browser.
Binary / Decimal / Hex / Octal Converter
Convert between binary, decimal, hexadecimal, and octal, and visualize bits and place values. Perfect for computer science students.
Design & visual tools
Creative & fun
Online Piano Keyboard
Play a virtual piano in your browser using your mouse or QWERTY keyboard across multiple octaves.
Custom Dice Roller & RPG Dice Simulator
Roll d4, d6, d8, d10, d12, and d20 dice with modifiers, animations, and roll history. Perfect for DnD and tabletop RPGs.
Online Beat Maker
Build drum patterns with a 16-step sequencer for kick, snare, hi-hats, and bass. Runs entirely in your browser using the Web Audio API.
Pixel Drawing Grid & Graph Paper
Draw pixel art and graph paper designs with an adjustable grid, color picker, undo/redo, and PNG export, all in your browser.