Free Calculators
and Generators
for Everyday Projects
Simple, useful tools for home, garden, design, crafts and more. No sign up, no downloads — just accurate results in seconds.
Browse by Category
View all tools →Home & Renovation
Paint, building materials, water and energy. 15 available tools.
Garden & Outdoor
Soil, lawn care and outdoor materials. 8 available tools.
Sewing & Quilting
Fabric quantities and cutting allowances. 3 available tools.
Food & Kitchen
Recipe quantities and ingredient scaling. 4 available tools.
Pets & Aquariums
Names and ideas for your animal companions. 6 available tools.
Photo & Printing
Image proportions, QR codes and barcodes. 6 available tools.
Education & Everyday
Units, percentages, time and random numbers. 7 available tools.
Family & Lifestyle
Travel, shared expenses and parcel estimates. 8 available tools.
Design & Images
Web colors, contrast and CSS effects. 4 available tools.
Party & Events
Beverage quantities and event budgets. 2 available tools.
Outdoor & Travel
Walking duration, pace and travel planning. 1 available tool.
Popular Tools
View all popular tools →Fuel Cost Calculator
Calculate fuel costs for your next trip.
Paint Coverage Calculator
Estimate how much paint you need.
Mulch Calculator
Find the right amount of mulch for your project.
Color Contrast Checker
Check color contrast for better accessibility.
Aspect Ratio Calculator
Resize images and video easily.
Random Number Generator
Generate random numbers in seconds.
No matching tools. Try “fuel”, “paint”, “mulch”, “color”, “ratio”, or “random”.
Fast & Free
Get instant results with no sign up or downloads.
Accurate & Easy to Use
Simple tools that give reliable results.
Works on Any Device
Use Jolbox on your phone, tablet or computer.