ToolBox Blog
Guides, tips, and updates on free online tools.
The Complete Guide to Free Online Unit Converters in 2026
Discover 1000+ free unit conversion tools covering length, weight, temperature, speed, energy and 40+ categories — all instant, no signup.
Dev Tools20+ Free Developer Tools Every Programmer Needs in 2026
From JSON formatters to regex builders, Docker generators to SQL tools — all the dev tools you need, free in your browser.
GuidesHow to Convert Any File Format Online — Free Guide
Complete guide to converting images, documents, audio, video, and data files between 100+ formats using free online tools.
EducationFree Math & Science Calculators for Students and Professionals
200+ free calculators covering algebra, calculus, trigonometry, statistics, physics, and chemistry — perfect for homework and professional work.
HealthFree Health & Fitness Calculators — BMI, TDEE, Macros & More
Calculate BMI, BMR, TDEE, macro splits, calorie burn, body fat, and more with free health calculators. No signup needed.
EngineeringFree Engineering & Construction Calculators — Concrete, Electrical, HVAC
210+ engineering calculators for structural, mechanical, electrical, HVAC, plumbing, and construction calculations.
FinanceFree Finance & Business Calculators — ROI, Compound Interest, Mortgage
120+ free financial calculators for loans, investments, business metrics, real estate, and salary calculations.