All Tools

Convert recipe serving sizes. Scale ingredients up or down based on desired number of servings. Perfect for adjusting recipes for different group sizes.

Food & Drink

Laundry Load Size Calculator

Calculate optimal washing machine load size based on machine type, fabric type, and soil level. Get recommendations for small, medium, large, or extra-large loads.

Home DIY

Cleaning Product Dilution Calculator

Calculate exact dilution ratios for cleaning products. Convert 1:10, 1:20, or custom ratios to precise amounts of concentrate and water needed.

Home DIY

Paint Color Lighting Preview

Preview how paint colors look under different lighting conditions. Enter a hex color code to see how it appears in warm light, cool light, and daylight.

Design

Air Fryer Conversion Calculator

Convert oven recipes to air fryer settings. Calculate adjusted temperature and cooking time for perfect air fryer results.

Food & Drink

Screen Distance & FOV Calculator

Calculate optimal viewing distance and field of view for phones, monitors, and TVs. Get recommendations based on screen size and resolution.

Tech

Age Gap Calculator

Calculate the age difference between two people. Shows age gap in years, months, and percentage. Educational tool for understanding age relationships.

Lifestyle Tools

AC BTU Calculator

Calculate required BTU (British Thermal Units) for air conditioning based on room size, ceiling height, and other factors. Estimate cooling power needed.

Home DIY

Marinade & Brining Time Calculator

Calculate safe minimum and maximum marinating/brining times for meat, poultry, and vegetables based on protein type and weight.

Food & Drink

Room Paint Quantity Calculator (Advanced)

Calculate exact paint and primer quantities needed for a room based on wall dimensions, number of doors, windows, and paint type.

Home DIY

Slow Cooker to Instant Pot Conversion Calculator

Convert slow cooker recipe times to Instant Pot pressure cooking times. Get accurate temperature and time conversions for perfect results.

Food & Drink

Calorie Burn Calculator for Household Chores

Calculate calories burned during household chores like cleaning, gardening, and yard work based on activity type, duration, and body weight.

Fitness

Home Energy Usage Estimator

Calculate monthly energy consumption and cost for individual appliances based on wattage and daily usage hours. Estimate electricity bills.

Home DIY

Water Intake Calculator

Calculate daily water intake recommendations based on body weight, activity level, and climate. Get personalized hydration guidelines.

Health

Wedding Guest Alcohol Calculator

Calculate wine, beer, and liquor quantities needed for wedding or event based on guest count, event duration, and drink preferences.

Lifestyle Tools

Shelf Weight Capacity Estimator

Estimate safe weight capacity for shelves based on material type, thickness, span length, and support configuration.

Home DIY

Carpet & Rug Size Room Visualizer

Visualize carpet and rug sizes in your room. Interactive grid-based room diagram to help choose the perfect rug size for your space.

Design

Solar Panel Angle Calculator

Calculate optimal solar panel tilt angle based on location (latitude) and season. Perfect for van life, RV, and home solar installations.

Travel

Clothing Size Converter

Convert clothing sizes between US, EU, UK, and Japan sizing systems. Works for shoes, tops, pants, and dresses.

Fashion

Child Growth Percentile Calculator

Calculate your child's growth percentile based on age, weight, and height. Visualize growth charts and track development.

Parenting

BPM Tap Tempo Tool

Tap to measure BPM (beats per minute) for music. Perfect for DJs and musicians. Client-side tool that measures time between taps.

Music

Audio Frequency Hearing Test

Test your hearing range with client-side tone generator. Discover which frequencies you can and cannot hear. Pure JavaScript audio test.

Health

Car Loan Affordability Calculator

Calculate how much car you can afford based on monthly income, loan term, and interest rate. Get recommended maximum car price.

Finance

Meal Prep Portion Container Planner

Plan meal prep container sizes and portions based on daily calories and meals per day. Calculate grams per meal and container recommendations.

Food & Fitness

Phone Storage Cleanup Planner

Estimate storage usage by photos, apps, and files. Get a personalized cleaning plan to free up space on your phone.

Tech

Home Office Ergonomics Calculator

Calculate optimal ergonomic setup for your home office. Get recommendations for seat height, screen height, keyboard angle, and desk setup.

Workplace

Movie Runtime to Start Time Planner

Calculate when a movie will end based on start time and runtime. Get end time and optional schedule reminders for perfect movie planning.

Entertainment

Sewing Pattern Scale Converter

Convert sewing pattern scales. Calculate correct percentage to print or adjust patterns based on original scale vs desired print size.

Crafts

HOA Fee Breakdown & True Cost Calculator

Calculate the true cost of HOA fees. Breakdown into per-day cost, percentage of mortgage, and long-term costs to determine if HOA fees are worth it.

Real Estate

Property Tax Increase Estimator (After Purchase)

Estimate property tax increases after buying a home. Calculate expected tax based on purchase price and regional averages. All calculations client-side.

Real Estate

Employee vs Contractor Cost Comparison Tool

Compare the true cost difference between hiring a W2 employee versus a 1099 contractor. Calculate total costs including taxes, benefits, and overhead.

Business

Energy Vampire Appliance Standby Cost Calculator

Calculate how much standby power (phantom energy) costs per year. Find out which appliances are energy vampires and their true cost.

Home Energy

Car Insurance Deductible Break-Even Calculator

Compare high deductible vs low deductible car insurance. Calculate break-even point based on accident likelihood and premium savings.

Automotive

Lease Buyout Value Estimator (Cars)

Compare lease residual value vs current market price to determine if buying out your car lease is worth it. Math-only tool with market price comparison.

Automotive

Business Shipping Carrier Cost Comparison Tool

Compare shipping costs across carriers. Input weight and dimensions to find the cheapest shipping option. Uses average behavioral patterns, no API needed.

E-commerce

Time-to-Save Calculator (Irregular Income)

Calculate how long it will take to save for a goal with irregular income. Perfect for freelancers, contractors, and variable income earners.

Finance

Lease vs Buy Furniture Cost Calculator

Compare the total cost of leasing furniture versus buying. Perfect for college students and short-term renters deciding between rent-to-own and purchase.

Home

Clothing Cost Per Wear Analyzer

Calculate the true value of clothing by analyzing cost per wear. Input price and expected uses to determine if clothing purchases are worth it.

Lifestyle

Rental vs Commercial Kitchen Calculator (Food Startups)

Help cottage bakers and food startups decide if renting a commercial kitchen is worth it. Compare rental costs vs home kitchen setup costs.

Business

Pet Adoption Lifetime Cost Estimator

Calculate the total lifetime cost of pet ownership. Estimate expenses for dogs, cats, and other pets including food, vet care, and supplies.

Pets

Student Housing Cost Comparison Tool

Compare dorm vs off-campus housing costs. Calculate real total cost including utilities, commuting, and hidden fees. Universities do not provide this tool.

Education

Podcast Equipment ROI Calculator

Calculate return on investment for podcast equipment upgrades. Determine if gear upgrades are worth it based on expected revenue and listener growth.

Creator Business

Salary After Relocation Cost-of-Living Calculator

Calculate equivalent salary after relocation using cost-of-living adjustments. Uses rent percentage, grocery index, and transportation index based on public data tables.

Finance

Contract Cancellation Penalty Estimator

Calculate the true cost of canceling contracts early. Works for gym memberships, phone plans, leases, and subscriptions. Shows remaining months, penalty percentage, and total cancellation cost.

Finance

Mattress Lifespan & Sagging Risk Calculator

Calculate estimated mattress lifespan and sagging risk based on weight, mattress type, and nightly hours of use. Get personalized recommendations for when to replace your mattress.

Lifestyle

Email Newsletter Growth Projection Calculator

Project your email newsletter list size over time. Input growth rate, churn rate, and send frequency to see projected subscriber counts. Perfect for content creators and marketers.

Business

Yard Sale Pricing Calculator

Get recommended sale prices for yard sale items. Enter item type and condition to receive pricing suggestions based on market value and condition. Perfect for garage sales and decluttering.

Lifestyle

Moving Truck Size Estimator

Estimate the right U-Haul or moving truck size based on number of boxes and furniture pieces. Get recommendations for small, medium, large, or extra-large trucks.

Lifestyle

Should I Repair or Replace Appliance Calculator

Determine if you should repair or replace your appliance. Input age, repair cost, and typical lifespan to get a recommendation. Save money on appliance decisions.

Home DIY

Food Expiry Leftovers Shelf Life Calculator

Calculate safe shelf life for leftovers and cooked foods. Uses USDA public data tables to determine safe days remaining based on food type and storage method.

Food & Drink

Home Cleaning Time Estimator

Estimate cleaning time based on home size and mess level. Get realistic time estimates for deep cleaning, regular cleaning, and quick cleanups. Perfect for planning cleaning schedules.

Lifestyle

Pet Grooming Cost Estimator

Estimate pet grooming costs based on breed, coat type, and desired cut. Get pricing estimates for different grooming services. Perfect for budgeting pet care expenses.

Pet Tools

Bedroom Furniture Layout Optimizer

Optimize your bedroom furniture layout with a simple grid planner. Drag and drop furniture pieces to find the best arrangement. No WebGL needed, works on all devices.

Design

Plant Repotting Size Recommendation Tool

Get recommended pot size for repotting plants. Calculate the ideal pot diameter based on current pot size. General rule: add 1-2 inches for optimal growth.

Garden

Basic Music Key Transposer

Transpose chords from one key to another. Simple, easy-to-use tool for musicians. Enter chords in the original key and get the transposed chords instantly.

Music

Car Battery Health Estimator

Estimate car battery health and remaining lifespan based on age and climate. No hardware needed. Get recommendations for when to replace your battery.

Automotive

Furniture Assembly Time Calculator

Estimate furniture assembly time based on brand, item type, and complexity. Get realistic time estimates for IKEA, Wayfair, and other furniture brands.

Lifestyle

Holiday Gift Budget Splitter

Split your holiday gift budget across categories. Enter total budget and get auto-balanced allocations by priority. Perfect for managing gift spending.

Lifestyle

Window Sunlight Exposure Estimator

Estimate sunlight hours for windows based on orientation and season. Calculate direct and indirect sunlight exposure. Perfect for plant placement and home design.

Garden

Shower Water Usage & Cost Calculator

Calculate water usage and cost per shower. See cost per minute and total monthly costs. Modern, easy-to-use tool for tracking water consumption.

Home DIY

Tomato Growing Start Date Planner

Plan when to start tomato seeds indoors and when to transplant outdoors. Calculate optimal start dates based on your last frost date and growing zone.

Garden

Phone Screen Replacement Cost Estimator

Estimate phone screen replacement costs by model. Uses average parts cost tables stored client-side. Get repair cost estimates for iPhone, Samsung, and other brands.

Tech

Coffee Roast Level Converter

Convert coffee roast levels using color picker. Estimate roast level from color, temperature, or roast stage. Unique tool for coffee enthusiasts.

Food & Drink

Cookie Dough Chilling Time Estimator

Calculate recommended chilling time for cookie dough. Input dough type and get optimal chill time recommendations. Perfect for achieving perfect cookie texture.

Food & Drink

Social Media Screen Time Goal Planner

Plan incremental reduction of social media screen time. Input current screen time and get a step-by-step reduction plan. Track progress toward healthier habits.

Lifestyle

Clothing Laundry Care Symbol Decoder

Decode laundry care symbols on clothing tags. Upload or select symbols to get washing, drying, and ironing instructions. Understand what each symbol means for proper garment care.

Lifestyle Tools

Home Office Internet Speed Recommender

Calculate recommended internet speed for your home office. Input number of users, video meetings, streaming, and other activities to get MB/s recommendations. Perfect for remote workers.

Tech

Kitchen Appliance Counter Space Planner

Calculate required counter space for kitchen appliances. Enter appliances you plan to use to determine total counter area needed. Perfect for kitchen planning and remodeling.

Home DIY

Food Fermentation Temperature Planner

Get ideal fermentation temperatures and duration for different foods. Enter food type to receive temperature ranges and fermentation timeline recommendations. Perfect for fermenting vegetables, dairy, and more.

Food & Drink

Water Filter Replacement Interval Estimator

Estimate when to replace your water filter. Input water usage and filter type to calculate replacement date. Track filter lifespan and get reminders for optimal water quality.

Home DIY

Closet Storage Capacity Calculator

Calculate closet storage capacity based on shelf dimensions and clothing type. Estimate how many items your closet can hold. Perfect for organizing and maximizing storage space.

Lifestyle Tools

Sleep Environment Score Calculator

Calculate your sleep environment score based on noise, light, temperature, and other factors. Get personalized recommendations to improve sleep quality. Perfect for optimizing your bedroom.

Lifestyle Tools

Shower Temperature Recommendation Tool

Optimal water temperature recommendations for your skin type, hair goals, eczema conditions, and circadian rhythm optimization.

Lifestyle Tools

Daily Light Exposure Planner

Circadian rhythm optimizer that tells you when to get sunlight or reduce light exposure for better sleep and energy levels.

Lifestyle Tools

Coffee Bean-to-Grind Setting Converter

Matches specific coffee beans and brewing methods to precise grinder settings for optimal extraction.

Food & Drink

Running Injury Risk Estimator

Estimates injury risk based on mileage, pace increases, footwear age, sleep quality, and muscle soreness levels.

Fitness

Home Humidity Target Calculator

Recommends optimal seasonal humidity levels and device settings for comfort and health.

Lifestyle Tools

Home Fragrance Diffuser Oil Ratio Calculator

Custom ratios for reed diffusers based on bottle size and desired fragrance strength.

Lifestyle Tools

Nail Polish Wear-Time Estimator

Estimates how long nail polish will last based on polish type, base coat, top coat, nail shape, and daily habits.

Lifestyle Tools

Hair Dye Fade Timeline Calculator

Predicts fade time based on hair porosity, color type, wash frequency, and care routine.

Lifestyle Tools

Camera Settings Recommender

Suggests ISO, shutter speed, and aperture settings based on lighting conditions and subject type.

Tech

Home Baking Altitude Adjustment Calculator

Automatically adjusts baking recipes for high altitude with temperature, time, and ingredient modifications.

Baking Tools

Haircut Maintenance Schedule Estimator

Predicts how often to trim based on hairstyle type and hair growth rate for optimal maintenance.

Lifestyle Tools

Protein Intake Planner by Lifestyle

Detailed protein recommendations for hair health, strength goals, satiety, and vegan options beyond basic TDEE.

Fitness

Air Fryer Wattage and Time Planner

Adapts recipes based on air fryer wattage differences to ensure proper cooking times and temperatures.

Food & Drink

Car Maintenance Timeline Customizer

Adjusts maintenance intervals by driving style, climate conditions, mileage, and terrain type.

Lifestyle Tools

Small Space Furniture Fit Visualizer

Checks if furniture dimensions fit through doors, hallways, and tight spaces before purchase or move.

Lifestyle Tools

Body Measurements to Clothing Pattern Converter

Auto-generates sewing measurements and pattern adjustments based on body shape and measurements.

DIY Tools

Posture-Friendly Backpack Fit Calculator

Recommends strap length, torso fit, and load height based on body type for optimal posture and comfort.

Hiking/Camping

Beverage Sweetness Adjustment Calculator

Converts sweetness levels between sugar, honey, syrups, and artificial sweeteners with accurate ratios.

Food & Drink