Free Online Calculators
50+ free calculators for finance, health, AI, math, and everyday life. No sign-up required.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization schedule.
FinanceCompound Interest
See how your money grows over time with compound interest.
FinanceLoan Calculator
Calculate auto, personal, or student loan payments.
FinanceSalary Calculator
Convert salary to hourly, weekly, or monthly pay.
FinanceRetirement Calculator
Plan your retirement savings and see if you're on track.
FinanceROI Calculator
Calculate return on investment for any project or asset.
FinanceCredit Card Payoff
Find out how long it'll take to pay off your credit card.
FinanceNet Worth Calculator
Track your assets and liabilities.
FinanceCurrency Converter
Convert between 50+ world currencies.
FinanceFreelance Rate Calculator
Determine your ideal hourly rate as a freelancer.
BusinessBreak-Even Calculator
Find the point where your revenue equals costs.
BusinessProfit Margin Calculator
Calculate gross, operating, and net profit margins.
BusinessSide Hustle Tax Calculator
Calculate your estimated taxes on side hustle income including self-employment tax, quarterly payments, and deductions.
FinanceCalorie (TDEE) Calculator
Calculate your total daily energy expenditure and calorie needs.
HealthBMI Calculator
Calculate your Body Mass Index and see your category.
HealthBody Fat Calculator
Estimate your body fat percentage.
HealthMacro Calculator
Calculate ideal protein, carbs, and fat intake.
HealthIdeal Weight Calculator
Find your ideal weight based on height and frame.
HealthWater Intake Calculator
How much water should you drink daily?
HealthHeart Rate Zone Calculator
Find your optimal training heart rate zones.
HealthPregnancy Due Date
Calculate your estimated due date.
HealthOvulation Calculator
Predict your ovulation and fertile window.
HealthGLP-1 Cost Calculator
Calculate the monthly and annual cost of GLP-1 medications like Ozempic, Wegovy, Mounjaro, and Zepbound with and without insurance.
HealthProtein Intake Calculator
Calculate your daily protein needs based on your weight, activity level, and fitness goals. Supports grams per pound and per kg.
HealthCreatine Dosage Calculator
Calculate your optimal creatine dosage for loading phase and maintenance based on body weight and type (monohydrate, HCL).
HealthAI Token Cost Calculator
Estimate costs for using AI models like GPT-4, Claude, and more.
AI & TechCloud Cost Calculator
Estimate monthly cloud computing costs.
AI & TechAPI Rate Limit Calculator
Plan API usage within rate limits.
AI & TechBandwidth Calculator
Calculate data transfer needs and bandwidth.
AI & TechVibe Coding Cost Calculator
Estimate your monthly costs for AI-powered coding tools like Claude, ChatGPT, Cursor, Windsurf, GitHub Copilot, and more.
AI & TechAI Spend Tracker
Track and estimate your monthly AI tool spending across ChatGPT, Claude, Midjourney, GitHub Copilot, and other AI subscriptions.
AI & TechAI App Cost Estimator
Estimate the cost to build an AI-powered app including API costs, hosting, development time, and ongoing maintenance.
AI & TechPercentage Calculator
Calculate percentages, increases, decreases, and differences.
MathFraction Calculator
Add, subtract, multiply, and divide fractions.
MathScientific Calculator
Advanced scientific calculations with trigonometry and more.
MathUnit Converter
Convert length, weight, temperature, and more.
MathGPA Calculator
Calculate your grade point average.
MathAge Calculator
Calculate your exact age in years, months, and days.
MathStandard Deviation
Calculate mean, variance, and standard deviation.
MathTip Calculator
Calculate tip amount and split the bill.
EverydayRent vs Buy Calculator
Should you rent or buy? Find out which is better.
HomeHome Affordability
How much house can you afford?
HomeSquare Footage Calculator
Calculate area for rooms, yards, and more.
HomeSolar Savings Calculator
Estimate your solar panel savings, payback period, and ROI based on your location, electricity usage, and roof size.
HomeCar Loan Calculator
Calculate monthly car payment and total cost.
AutoGas Mileage Calculator
Calculate your vehicle's fuel efficiency.
AutoCar Depreciation Calculator
See how much your car will be worth over time.
AutoEV Savings Calculator
Calculate how much you can save by switching to an electric vehicle. Compare gas vs EV fuel costs, maintenance savings, tax credits, CO2 emissions reduction, and break-even time with our comprehensive side-by-side EV savings calculator.
AutoDate Difference
Calculate the exact days between two dates.
Date & TimeCountdown Calculator
Count down to any date or event.
Date & TimeWork Hours Calculator
Calculate work hours and earnings.
Date & TimeCrypto Profit Calculator
Calculate cryptocurrency investment profits.
NicheSocial Media Engagement
Calculate your engagement rate across platforms.
NicheCarbon Footprint Calculator
Estimate your environmental impact.
NicheInflation Calculator
Calculate how inflation affects purchasing power over time with historical CPI data.
FinanceMileage Reimbursement Calculator
Calculate tax-deductible mileage reimbursement for business travel using IRS standard rates.
BusinessBra Size Calculator
Calculate your bra size from underbust and bust measurements with international size conversions.
EverydayRoofing Calculator
Calculate roofing materials, squares, and cost for gable, hip, and flat roof types.
HomeConcrete Calculator
Calculate how much concrete you need for slabs, footings, columns, and steps in cubic yards or meters.
HomeShoe Size Conversion
Convert shoe sizes between US, UK, EU, and CM for men, women, and kids.
EverydayTire Size Calculator
Compare tire sizes, calculate diameter, sidewall height, speedometer error, and find equivalent tires.
AutoCanadian Mortgage Calculator
Calculate Canadian mortgage payments with semi-annual compounding, CMHC insurance, and amortization.
FinanceDownload Time Calculator
Calculate how long it takes to download a file based on your internet speed. Compare across common speed tiers.
EverydayInternet Speed Calculator
Find out how much internet speed you need based on your household's streaming, gaming, video calls, and smart home usage.
EverydayTake-Home Pay Calculator
Calculate your net take-home pay after federal tax, state tax, FICA, 401(k), HSA, and insurance deductions for 2025 and 2026.
FinanceTime Duration Calculator
Calculate the exact duration between two dates and times, or add/subtract time from a date. Includes business days calculation.
Date & TimeBusiness Loan Calculator
Calculate monthly payments for business loans including SBA 7(a), term loans, lines of credit, and equipment financing with amortization.
BusinessReal Estate Investment Calculator
Evaluate rental property investments with NOI, cap rate, cash-on-cash return, rental yield, and 10-year cash flow projections.
BusinessDebt Payoff Calculator
Plan your debt-free journey with avalanche vs snowball strategies. See payoff timelines, interest savings, and optimal payment allocation.
FinanceStudent Loan Calculator
Calculate monthly payments, total interest, and repayment timeline for federal and private student loans with multiple repayment plans including income-driven repayment.
FinanceCollege Cost Calculator
Estimate the total cost of college including tuition inflation, room and board, and plan your savings with a 529 college fund projection.
FinanceMutual Fund Calculator
Calculate mutual fund returns with SIP or lump sum, compare fund categories, and see the impact of expense ratios and loads on your investment growth.
FinanceBond Calculator
Calculate bond yield to maturity, price, duration, convexity, and analyze price sensitivity to interest rate changes for government and corporate bonds.
FinancePresent Value Calculator
Calculate present value and future value of annuities, analyze NPV and IRR of investment projects with cash flow timelines and detailed amortization.
FinanceCircle Calculator
Calculate circle radius, diameter, circumference, and area from any one known property with interactive circle diagram.
MathPythagorean Theorem Calculator
Calculate the missing side of a right triangle using the Pythagorean theorem with visual diagram and triangle classification.
MathTriangle Calculator
Solve triangles using SSS, SAS, ASA, AAS methods. Calculate angles, sides, area, perimeter, inradius, and circumradius with interactive triangle diagram.
MathSlope Calculator
Calculate slope, distance, midpoint, angle, and line equations (slope-intercept, point-slope, standard form) between two points with coordinate plane visualization.
MathArea Calculator
Calculate the area of rectangles, triangles, trapezoids, parallelograms, circles, ellipses, sectors, and rhombuses with shape diagrams.
MathVolume Calculator
Calculate the volume and surface area of cubes, spheres, cylinders, cones, pyramids, prisms, and tori with 3D shape diagrams.
MathSurface Area Calculator
Calculate total, lateral, and base surface area of 3D shapes including cubes, spheres, cylinders, cones, pyramids, and hemispheres with net diagrams.
MathNumber Sequence Calculator
Analyze number patterns to identify arithmetic, geometric, Fibonacci, quadratic, and power sequences. Predict next terms with formula and step-by-step explanation.
MathSample Size Calculator
Calculate the required sample size for surveys and research studies using Cochran's formula with finite population correction.
MathProbability Calculator
Calculate probability for single events, compound events (AND/OR), and complementary probability with odds notation and probability scale.
MathStatistics Calculator
Comprehensive descriptive statistics including quartiles, IQR, outlier detection, skewness, frequency distribution, and box plot visualization.
MathMean Median Mode Range
Calculate mean, median, mode, and range for any dataset with step-by-step solutions and frequency distribution visualization.
MathPermutation & Combination
Calculate permutations (nPr), combinations (nCr), and factorials with step-by-step computation and Pascal's triangle.
MathZ-Score Calculator
Calculate z-scores, percentiles, and probabilities for normal distribution. Convert between raw scores and z-scores with bell curve visualization.
MathConfidence Interval Calculator
Calculate confidence intervals for population means and proportions with margin of error, z-critical values, and number line visualization.
MathQuadratic Formula Calculator
Solve quadratic equations ax² + bx + c = 0 with step-by-step solutions, discriminant analysis, vertex form, and parabola visualization.
MathLog Calculator
Calculate logarithms in any base including common log (base 10), natural log (ln), binary log (base 2), or custom base with step-by-step solutions.
MathRandom Number Generator
Generate random numbers with options for integers, decimals, even/odd/prime only, custom range, no duplicates, and sorting.
MathExponent Calculator
Calculate base raised to any exponent power with support for negative bases, fractional exponents, Euler's number e, and exponent laws reference.
MathAmortization Calculator
Generate a full loan amortization schedule with monthly payments, principal vs interest breakdown, and total cost analysis for any loan term.
FinanceTile Calculator
Calculate how many tiles you need for any room including waste factor, total cost, and number of boxes. Supports any tile size and room dimensions.
ConstructionDebt-to-Income Ratio Calculator
Calculate your debt-to-income (DTI) ratio with front-end and back-end analysis. See if you qualify for mortgages and other loans.
FinanceFuel Cost Calculator
Calculate trip fuel costs based on distance, fuel efficiency (MPG), and gas price. See cost per mile, round trip cost, and commute estimates.
AutoDiscount Calculator
Calculate sale prices, discount amounts, and total savings including tax. See exactly what you pay after percentage discounts and sales tax.
ShoppingHeat Index Calculator
Calculate the feels-like temperature based on air temperature and humidity using the NWS Rothfusz equation. Includes risk levels and safety recommendations.
WeatherYouTube Money Calculator
Estimate your YouTube channel earnings based on daily views, CTR, niche, and viewer region. Compare ad revenue, sponsorships, affiliate income, and merchandise. See CPM rates by niche and project annual income.
Social MediaTikTok Money Calculator
Calculate your TikTok earnings from Creator Fund, sponsorships, LIVE gifts, and affiliate marketing. See your creator tier, engagement rate, and niche RPM comparison.
Social MediaFinancial Independence Calculator
Calculate your FI number, years to financial freedom, and see the impact of savings rate on your timeline. Compare Lean FI, Standard FI, and Fat FI targets with multiple withdrawal strategies and post-retirement sustainability analysis.
FinanceTrue Cost of Subscriptions Calculator
Add up every subscription — streaming, software, gym, delivery — and see your real monthly total, annual cost, daily drain, and what that money could grow to if invested instead. Free, private, instant.
FinanceSleep Calculator
Find your optimal bedtime based on natural 90-minute sleep cycles. See recommended bedtimes, quality scores by age group, nap recommendations, and a full cycle breakdown.
HealthPaint Calculator
Estimate how much paint you need for any room. Calculate gallons and liters based on room dimensions, doors, windows, and number of coats.
HomeHouse Paint Calculator
Full house interior and exterior paint estimator. Calculate paint needed, DIY vs professional cost, and breakdown by section for any home size.
HomeBedroom Paint Calculator
Specialized paint estimator for bedrooms with room type suggestions, color scheme recommendations, and closet deductions.
HomeCommute Cost Calculator
Compare daily, monthly, and yearly commute costs across car, bus, train, and bicycle. Includes fuel, parking, maintenance, CO2 emissions, and savings analysis.
EverydayGrade Calculator
Calculate your current class grade from assignments, tests, and categories with weighted grading. Supports custom categories, shows letter grade with +/- modifiers, and a detailed breakdown of each category's contribution.
MathFinal Grade Calculator
Find out what score you need on your final exam to achieve your desired grade. Enter your current grade, desired grade, and final exam weight to get instant results.
MathSales Tax Calculator
Calculate sales tax amount and total price from any item price and tax rate. Supports reverse calculation to find the pre-tax price from a total. Includes a reference table of US state sales tax rates.
ShoppingTime Zone Converter
Convert time between any two time zones worldwide. See live clocks, time differences, and find the best meeting times across time zones. Covers all major cities and regions.
Date & TimeBusiness Days Calculator
Calculate business days between two dates or add business days to a date. Excludes weekends and US federal holidays. Essential for project deadlines, contract dates, and delivery estimates.
Date & Time
Trusted by 50,000+ users worldwide
“SupaCalc's AI Token Cost calculator saved me from a $200 surprise bill. I use it every day now to track my API costs.”
Sarah K.
Freelance Designer
“The mortgage calculator is hands down the best I've used online. Clean, fast, and my clients love it. I send the link to everyone.”
Marcus J.
Real Estate Agent
“I use the calorie and macro calculators with all my clients. It's become an essential part of my coaching toolkit. So accurate!”
Aisha L.
Fitness Coach