🧮 Calculators
139 tools in this category • Page 4 of 5 • All free to use
About Calculators
Our calculator collection provides accurate, instant results for a wide range of mathematical, financial, health, chemistry, and marketing calculations. Whether you are planning your budget, checking your health metrics, analyzing marketing campaigns, or performing complex scientific operations, these tools deliver professional-grade accuracy with user-friendly interfaces.
All calculators work entirely in your browser for privacy and provide detailed breakdowns of results with industry benchmarks where applicable. Perfect for students, professionals, marketers, and anyone who needs reliable calculation tools.
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Password Entropy Estimator
Calculate password strength using Shannon entropy with comprehensive security analysis and crack time estimates
Percentage Calculator
Calculate percentages, percentage changes, tips, discounts, and more with our comprehensive percentage calculator featuring step-by-step explanations and multiple calculation types.
Percentage Error Calculator - Math & Physics
Calculate percentage error between measured and actual values for scientific experiments and academic studies
Percentage Off Calculator
Calculate discount savings and percentage off from original and sale prices instantly
Physics Calculator
Comprehensive physics calculator for mechanics, electricity, thermodynamics, waves, and modern physics
Plant Watering Reminder
Generate customized watering schedules for your plants based on type, season, and environment
Plywood Sheet Optimizer
Calculate optimal cutting layouts for plywood sheets with visual SVG diagrams and material efficiency analysis
Portion Size Calculator
Calculate precise ingredient portions and serving sizes for any number of people with comprehensive cooking measurements and meal planning guidance
Posture Reminder
Pop-up reminder tool that nudges you every X minutes to check and improve your posture for better health
Potty Training Schedule
Plan and log potty training attempts with visual progress tracking and downloadable schedules for children's bathroom training success
Prime Number Checker
Check if any number is prime with detailed mathematical explanations and factor analysis
Profit Loss Calculator
Comprehensive profit and loss calculator for business P&L statements, trading profits, gross/net margins, break-even analysis, and ROI calculations
Rainfall Tracker
Track daily rainfall data and calculate cumulative watering totals over time
Recipe Nutrition Estimator
Estimate nutrition facts for recipes using preloaded ingredient database - calculate calories, protein, carbs, and fat per serving
Recipe Scaler
Scale recipe ingredient quantities up or down for any number of servings instantly
Roof Shingle Estimator
Calculate shingle quantities, squares, and costs for your roofing project with accurate measurements
Savings Calculator
Professional savings calculator with emergency fund planning, goal-based savings, compound interest analysis, and inflation adjustment for comprehensive financial planning
School Attendance Tracker
Track student attendance with daily records, calculate attendance rates, and generate attendance reports for classrooms
School Lunch Planner
Generate balanced school lunch menus following USDA nutrition guidelines with dietary accommodations and allergen considerations
Scientific Calculator
Advanced scientific calculator with expression parser supporting mathematical functions, trigonometry, logarithms, and complex calculations
Seed Starting Schedule
Calculate optimal indoor and outdoor seed starting dates based on your last frost date and crop selection
Serving Temperature Guide
Reference safe serving temperatures for different dishes with food safety guidelines and USDA compliance
Shelving Cut Calculator
Calculate optimized cut plans for shelving projects with minimal wood waste and detailed material lists
Shipping Cost Estimator
Calculate accurate shipping costs based on weight, distance, and custom rates with detailed breakdown
Simple Compound Growth Chart
Visualize compound growth over time with interactive charts showing exponential growth patterns and financial projections
Simple Loan Overpayment Estimator
Calculate the effect of extra loan payments per period with detailed overpayment analysis and savings projections
Slope & Y-Intercept Calculator
Calculate slope and y-intercept from two points to find linear equation y=mx+b with detailed step-by-step solutions
Smart Tip Calculator
Professional tip calculator with percentage options, bill splitting, tax calculations, and dining etiquette guidance for accurate gratuity calculations.
Soil pH Tracker
Track and visualize soil pH test results over time with charts and agricultural insights
Square Root & Cube Root Calculator
Calculate square roots and cube roots of any number with customizable precision and step-by-step explanations