100+ Free Online Calculators & Tools
Professional-grade calculators, converters, and utilities across 27 specialized categories. 100% free, no registration required, mobile-friendly.
Professional Calculator Categories
Construction Calculators
Concrete, gravel, lumber, and comprehensive building material calculators for contractors and DIY projects
Engineering Calculators
Structural, electrical, mechanical engineering calculators for professional applications
Roofing Calculators
Roof area, pitch, shingle, and material calculators for roofing professionals
Painting Calculators
Paint coverage, room area, and material cost calculators for painting projects
Loan & Mortgage Calculators
Mortgage payments, refinancing, PITI, and comprehensive home loan calculators
Investment Calculators
ROI, compound interest, portfolio analysis, and investment planning calculators
Automotive Finance Calculators
Car loan payments, lease vs buy, fuel costs, and automotive financial planning tools
Retirement Calculators
401k, IRA, pension, and comprehensive retirement planning calculators
Insurance Calculators
Life, health, auto insurance premium and coverage calculators
Business Finance Calculators
Cash flow, profit margin, break-even, and business financial planning tools
Health & Body Calculators
BMI, BMR, body fat percentage, and comprehensive health assessment tools
Fitness Calculators
Calorie burn, exercise tracking, workout planning, and fitness goal calculators
Medical Calculators
Clinical dosage, medical scoring, and healthcare professional calculators
Academic Calculators
GPA, grade point average, academic performance, and student assessment tools
College Calculators
Student loans, tuition costs, college savings, and higher education financial planning
Basic Math Calculators
Basic arithmetic, algebra, and fundamental mathematics calculators
Math Calculators
Advanced mathematical calculators and problem-solving tools
Geometry Calculators
Area, volume, perimeter, and comprehensive geometric calculators
Statistics Calculators
Statistical analysis, probability, and data science calculators
Percentage Calculators
Percentage change, increase/decrease, discount, and ratio calculators
Conversion Calculators
Unit converters for length, weight, temperature, area, volume, and more measurements
Time Calculators
Date calculations, age calculators, countdown timers, and time-related utilities
Text Processing Tools
Word counters, text formatters, JSON tools, and comprehensive text utilities
Security Tools
Password generators, QR codes, hash generators, and digital security utilities
Design Tools
Color pickers, image tools, design utilities, and creative professional tools
Digital Marketing Tools
QR codes, hash generators, analytics tools, and digital marketing utilities
Scientific Calculators
Advanced scientific, engineering, and research-grade calculators
Currently Available Tools
We currently have 85+ working tools available. Browse our existing collection while we expand to 299+ professional tools.
Why Choose Our Professional Tools?
Lightning Fast
Instant calculations with optimized performance
Precision Accuracy
Professional-grade algorithms and formulas
Privacy First
No tracking, no data collection, secure calculations
Mobile Ready
Perfect experience on phones, tablets, and desktops