Solve Problems. Succeed.

Free, practical tools designed to remove obstacles and help you get things done.

Explore Tools Learning Practice SterlingCat · Money InitiCat · Start small

WHO, NIST, IRS formulas 100% in-browser Free, 7 languages

What Are You Working On?

Home Improvement Project

Calculate insulation, size HVAC systems, check wiring, and plan financing.

Insulation R-Value Calculator Heat Load Calculator HVAC Sizing Calculator Mini Split Sizing Calculator Duct Size Calculator Voltage Drop Calculator Wire Size & Ampacity Calculator

Prep Meals & Cook

Scale recipes, convert units, and calculate nutrition for any occasion.

Recipe Scaler Cooking Unit Converter Grams to Cups Converter Nutrition Label Generator & Recipe Analyzer Crowd Food Calculator Calorie Calculator

Design for the Web

Build color palettes, check accessibility, and optimize images.

Color Palette Generator Color Contrast Checker Color Converter Favicon Generator Image Compressor Slug Generator

Focus & Unwind

Boost productivity with timers, then relax with ambient sounds.

Pomodoro Timer Visual Timer Breathing Timer Noise Machine Binaural Beats Generator Soundscape Generator

Play & Practice Music

Generate tones, keep tempo, tune instruments, learn chords, and train your ear.

Online Tone Generator Metronome Instrument Tuner Chord Chart Ear Pitch Trainer Virtual Piano

Prepare Documents

Merge, compress, and sign PDFs, then polish your text.

Merge PDF Compress PDF Sign PDF Add Page Numbers Word & Character Counter Images to PDF

Make Better Decisions

Weigh options, clarify values, and think through decisions before you commit.

Decide Navigate Core Values Decision Journal Expectation Tracker Commitment Tracker Assumptions Map Fact Base

Plan & Organize

Count down to events, calculate dates, and keep time on your side.

Event Countdown Age Calculator Time Calculator Stopwatch Visual Timer

Print & Create

Design custom calendars, coloring pages, craft paper, and printable sheets.

Calendar Maker Coloring Pages Craft Pattern Paper Paper Generator Music Paper

Popular Tools

Online Tone Generator

Free online tone generator, sine wave generator, and pitch generator. Play pure tones from 20 Hz to 20 kHz with 6 waveforms, frequency sweep mode, and WAV export.

Visual Timer

See time run out with color-coded countdown. 4 modes: circle, bar, sand, text. Fullscreen, classroom presets, keyboard shortcuts.

Nutrition Label Generator & Recipe Analyzer

Free nutrition label generator from any recipe — create FDA-compliant nutrition facts in 4 formats with macro breakdowns, daily value charts, and allergen detection.

Duct Size Calculator

Calculate HVAC duct dimensions from airflow (CFM). Supports round and rectangular ducts with velocity validation.

Crowd Food Calculator

Calculate food quantities per guest count for any event. Supports sit-down dinners, buffets, BBQs, and appetizer parties with 6 event presets and adjustments for kids, appetite, and duration.

Decimal Feet Converter

Convert between feet-and-inches (with fractions) and decimal feet. Bidirectional with quick reference table.

Grade Calculator

Calculate grades, weighted averages, final exam scores, and grade curves instantly.

Binaural Beats Generator

Create binaural beats for sleep, relaxation, focus, and meditation with adjustable frequencies and session timer.

Time Zone Converter

Find the time difference between any two cities. Convert times across 600+ cities using the IANA time zone database with DST handling, UTC offsets, and a meeting planner.