All Calculators - Kalcufy
- Auto Loan Calculator - Calculate your monthly car payment, total interest, and see a full amortization schedule with trade-in and tax options.
- Quadratic Formula Calculator - Solve quadratic equations instantly
- Tip Calculator - Calculate the tip, split the bill, and settle up fast β with pre-tax options for any group size
- Age Calculator - Calculate your exact age with zodiac signs, life statistics, and planetary ages
- Body Fat Calculator - Estimate your body fat percentage with 5 science-backed methods β no calipers needed.
- Caloric Deficit Calculator - Calculate your ideal calorie deficit and see how long it takes to reach your goal weight with a personalized plan.
- Maintenance Calories Calculator - Calculate your TDEE, BMR, BMI, macros, and body composition with the most advanced free calculator β uses multiple formulas for maximum accuracy
- One Rep Max Calculator - Estimate your one-repetition maximum using 7 proven formulas with warm-up calculator and strength standards
- BMI Calculator - Calculate your Body Mass Index, waist-to-height ratio, body fat percentage, and healthy weight range with ethnic-specific thresholds and personalized insights
- Ideal Weight Calculator - Find your ideal body weight using 7 science-backed formulas β with frame size, activity level, and ethnic adjustments
- Keto Calculator - Calculate your personalized keto macros for fat, protein, and net carbs with meal examples, electrolyte targets, and training day adjustments
- Lean Body Mass Calculator - Calculate your lean body mass with Boer, James, and Hume formulas β plus body composition chart, protein targets, BMR, TDEE, and actionable meal plans
- Macro Calculator - Calculate your daily macros with dual BMR formulas, 8 diet types, custom ratios, protein analysis, and per-meal macro splitting β visualize your nutrition plan with our free macro calculator
- Water Intake Calculator - Find your personalized daily water intake based on weight, activity, climate, and lifestyle β not the generic 8 glasses rule
- Sleep Calculator - Find your perfect sleep schedule with personalized cycle timing, chronotype alignment, caffeine cutoff, light exposure plan, and recovery planning β free sleep cycle calculator
- Rest Day Calculator - Advanced recovery calculator with heart rate monitoring, hydration tracking, and personalized readiness scores
- Running Pace Calculator - Calculate your pace, predict race times, get VDOT training zones, heart rate zones, and personalized split times for any distance
- Protein Calculator - Calculate your optimal daily protein intake, get personalized meal plans, and discover the best high-protein foods for your diet
- Waist-to-Height Ratio Calculator - Assess your cardiometabolic risk with a metric more accurate than BMI β plus get your target waist, BMI comparison, and personalized action plan
- Heart Rate Zones Calculator - Get personalized training zones using Karvonen, LTHR, or 4 different MaxHR formulas β with sport-specific adjustments, fat burn zones, and calorie estimates
- Weight Gain Calculator - Calculate daily calories, surplus, macros, and body composition tracking to gain weight safely with Mifflin-St Jeor and Katch-McArdle formulas
- Weight Loss Calculator - Calculate your daily calorie target, deficit, and macros for safe weight loss with metabolic adaptation, dual BMR formulas, and body composition tracking
- Calories Burned Calculator - Find out how many calories you burn during any exercise or activity using scientifically-validated MET values
- TDEE Calculator - Calculate your Total Daily Energy Expenditure using 3 scientific formulas with interactive charts and personalized calorie goals
- Calorie Calculator - Find your daily calorie needs with zig-zag cycling, macro breakdown, and diet mode support for smarter nutrition planning
- BMR Calculator - Calculate your Basal Metabolic Rate, TDEE, and daily calorie needs using 3 scientifically validated formulas
- Pregnancy Due Date Calculator - Calculate your estimated due date using 5 methods β LMP, conception, ultrasound, IVF transfer, or known date with trimester timeline
- Currency Converter - Convert between 45+ world currencies using mid-market exchange rates.
- Length Converter - Convert between 18 length units instantly β from nanometers to light-years.
- CM to Inches Converter - Convert centimeters to inches instantly with a conversion table for common values.
- Inches to CM Converter - Convert inches to centimeters instantly with a reference table for common measurements.
- KM to Miles Converter - Convert kilometers to miles instantly β perfect for running, driving, and travel distances.
- Miles to KM Converter - Convert miles to kilometers instantly β perfect for running, driving, and navigation.
- Meters to Feet Converter - Convert meters to feet instantly β ideal for height, construction, and real estate measurements.
- Feet to Meters Converter - Convert feet to meters instantly β great for height, construction, and international measurements.
- MM to Inches Converter - Convert millimeters to inches instantly β essential for engineering, manufacturing, and precision work.
- Inches to MM Converter - Convert inches to millimeters instantly β perfect for engineering, hardware, and precision measurements.
- CM to Feet Converter - Convert centimeters to feet and inches instantly β perfect for height conversions and measurements.
- Feet to CM Converter - Convert feet to centimeters instantly β ideal for height, furniture, and room measurements.
- Inches to Feet Converter - Convert inches to feet and inches instantly β great for height, screen sizes, and measurements.
- KG to LBS Converter - Convert kilograms to pounds instantly β essential for travel, fitness, shipping, and cooking.
- LBS to KG Converter - Convert pounds to kilograms instantly β perfect for fitness, travel, shipping, and cooking.
- Celsius to Fahrenheit Converter - Convert Celsius to Fahrenheit instantly β essential for weather, cooking, travel, and science.
- Fahrenheit to Celsius Converter - Convert Fahrenheit to Celsius instantly β essential for weather, cooking, travel, and science.
- OZ to ML Converter - Convert fluid ounces to milliliters instantly β essential for cooking, drinks, medicine, and travel.
- Paint Calculator - Calculate how much paint you need for any room and estimate the total cost of your project.
- Concrete Calculator - Estimate cubic yards, bags, weight, cost, and rebar for slabs, columns, walls, and stairs.
- IP Subnet Calculator - Calculate subnet mask, network address, broadcast, wildcard mask, and usable host ranges from any IPv4 address and CIDR prefix.
- CIDR Calculator - Convert between CIDR notation, subnet masks, and IP ranges. Calculate network details with cloud provider support, supernet detection, and reverse IP-to-CIDR conversion.
- Bandwidth Calculator - Convert between bandwidth units (Mbps, Gbps, MB/s) and estimate the bandwidth needed to host a website or service.
- VLSM Calculator - Divide a network into variable-size subnets using VLSM. Allocate IP addresses efficiently with minimum waste β enter your host requirements and get optimal subnets.
- Password Strength Calculator - Analyze password entropy, detect weak patterns, and estimate crack times across 7 attack scenarios β including quantum computing. 100% private, nothing leaves your browser.
- RAID Calculator - Calculate RAID capacity, performance, rebuild time, and URE risk for all RAID levels
- PSU Calculator - Calculate the ideal power supply wattage for your PC build. Accounts for overclocking, capacitor aging, 80 PLUS efficiency, and annual energy cost.
- Intermittent Fasting Calculator - Plan your fasting schedule, calculate daily calories and macros, and see your estimated results.
- Ovulation Calculator - Track your fertile window, predict ovulation day, and plan ahead with a 6-month fertility calendar.
- Pregnancy Due Date Calculator - Estimate your due date, track baby's weekly growth, and view your complete prenatal milestone timeline with personalized dates
- Conception Date Calculator - Estimate when conception occurred based on your due date, last period, or ultrasound β plus your probable fertile window.
- Implantation Calculator - Predict your implantation window, see daily probability by DPO, and find the best day to take a pregnancy test.
- Chinese Gender Predictor - Predict your baby's gender using the ancient Chinese lunar calendar chart β with planning mode and zodiac insights.
- hCG Calculator - Track your hCG blood draw levels, calculate doubling time, and compare against normal pregnancy ranges with visual charts
- Gallons to Liters Converter - Convert gallons to liters instantly. Works for US and UK gallons with metric equivalents.
- Cups to mL Converter - Convert cups to milliliters for cooking and baking. Includes tablespoons, teaspoons, and fluid ounces.
- Square Feet to Square Meters Converter - Convert square feet to square meters for real estate, construction, and floor planning.
- MPH to KM/H Converter - Convert miles per hour to kilometers per hour for speed comparisons, travel planning, and vehicle specs.
- Date Calculator - Add or subtract days, weeks, months, years from any date. Calculate the difference between two dates instantly.
- Loan Calculator - Calculate your monthly loan payment, total interest, and view a full amortization schedule. See how extra payments save you money.
- Percentage Calculator - Calculate percentages instantly β find X% of Y, what percent X is of Y, or the percentage change between two numbers.
- Random Number Generator - Generate random numbers instantly. Set your range, quantity, and options for lottery picks, dice rolls, or any random selection.
- Cuadras to Hectares Converter - Convert cuadras to hectares, acres, and square meters β the traditional land unit of Argentina, Uruguay, and Paraguay.
- Fanegadas to Hectares Converter - Convert fanegadas to hectares, acres, and square meters β Colombia's traditional land unit.
- Manzanas to Hectares Converter - Convert manzanas to hectares, acres, and square meters β the standard land unit in Central America.
- Tareas to Square Meters Converter - Convert tareas to square meters, hectares, and acres β the Dominican Republic's land measurement unit.
- Varas to Meters Converter - Convert varas to meters, feet, and inches β the traditional Latin American unit of length.
- Discount Calculator - Calculate the sale price, savings amount, and final cost after discount and tax instantly.
- GPA Calculator - Calculate your semester and cumulative GPA on the 4.0 scale. Enter course names, letter grades, and credit hours. Supports A+ (4.3), Pass/No Pass, and prior GPA.
- Grade Calculator - Calculate your weighted grade, simple percentage, or find out what you need on the final exam to reach your target grade.
- Time Calculator - Add, subtract, and convert time durations with hours, minutes, and seconds.
- Square Footage Calculator - Calculate the area of any space in square feet, meters, or yards β for flooring, painting, landscaping, and construction projects.
- Flooring Calculator - Calculate how much flooring material you need β in square feet, boxes, and estimated cost β for any room or project.
- Roofing Calculator - Estimate your roof area, materials needed, and project cost based on dimensions and roof pitch.
- Savings Goal Calculator - Find out how much you need to save each month, week, or day to reach your financial goal β with interest and inflation included.
- Drywall Calculator - Calculate how many drywall sheets you need, plus screws, tape, joint compound, and cost estimates.
- Mulch & Gravel Calculator - Calculate how much mulch, gravel, stone, or soil you need in cubic yards and bags β with cost estimates.
- Mortgage Calculator - Estimate your monthly mortgage payment including principal, interest, taxes, insurance, PMI, and HOA β with a full amortization schedule.
- 401(k) Calculator - Estimate your 401(k) balance at retirement with employer match, salary growth, and inflation β see how your savings grow over time.
- Amortization Calculator - Generate a complete amortization schedule and see how extra payments can save you thousands in interest.
- BTU Calculator - Calculate the BTU cooling or heating capacity needed for any room based on size, insulation, sun exposure, and occupancy.
- Debt Payoff Calculator - Create your personalized debt-free plan using snowball, avalanche, or minimum payment strategies.
- Fence Calculator - Calculate posts, pickets, rails, concrete, and materials needed for wood, chain link, or vinyl fencing projects.
- Tile Calculator - Calculate how many tiles you need plus grout, thinset, and cost estimates for any floor, wall, or backsplash project.
- Credit Card Interest Calculator - See exactly how much interest you're paying, your true cost, and how faster payments or a balance transfer can save you thousands.
- Personal Loan Calculator - Calculate your monthly payment, total interest, and real APR including origination fees. See how extra payments save you thousands.
- Compound Interest Calculator - Calculate how your money grows with compound interest, regular contributions, and see the real impact of inflation and taxes on your returns
- KG to Stones Converter - Convert kilograms to stones and pounds instantly β essential for understanding UK body weight measurements.
- Pints to Liters Converter - Convert pints to liters instantly β supports both US and UK (Imperial) pint standards for cooking, beverages, and daily use.
- Stones to KG Converter - Convert stones to kilograms instantly with a reference table for common weights β perfect for UK to metric conversions.
- Tablespoons to mL Converter - Convert tablespoons to milliliters instantly β essential for cooking, baking, and medicine dosing with US, UK, and metric standards.
- Credit Card Payoff Calculator - Find out how long it takes to pay off your credit card, see the true cost of minimum payments, and discover how much faster you can be debt-free
- Password Generator - Generate strong random passwords, memorable passphrases, and secure PINs with real-time strength analysis and crack time estimates.
- Transfer Time Calculator - Estimate how long it takes to download, upload, or copy any file. Compares 20 interfaces including WiFi 7, Thunderbolt 5, and USB4 v2 β with real-world overhead.