Hub de calculadoras
Calculadoras gratuitas, agrupadas según tu necesidad
Elige tu intención — fechas, finanzas, fitness o utilidades diarias — y ve directo a la herramienta indicada. Todas las calculadoras son gratis, se ejecutan al instante en tu navegador y nunca piden registro.
Calculadoras de fecha y tiempo
Organiza tu agenda con matemática de fechas: cuenta atrás para plazos, suma o resta días, calcula horas de turno y convierte horarios entre las zonas horarias del mundo.
Date Math
4 calculadorasCalendar arithmetic: countdowns, add or subtract days/weeks/months, exact differences, and business-day counts.
Work & Scheduling
4 calculadorasPlan work and meetings: timesheet hours, time-zone conversions, business days, and a millisecond stopwatch.
Personal Time
2 calculadorasPersonal countdowns and milestones: exact age in years, months, and days, plus countdowns to any future date.
Moon & Lunar Dates
3 calculadorasLunar calendar tools: current moon phase for any date, lunar age in the East Asian system, and exact Gregorian age.
Day Counting
4 calculadorasCount forward and back: days from today, time elapsed since a past date, exact date differences, and add/subtract days.
Relationship Milestones
3 calculadorasAnniversary math: how long you've been together, how long you've been married, and exact age in years, months, and days.
Calculadoras de finanzas y dinero
Presupuesta, pide prestado, invierte y analiza: cuotas hipotecarias, refinanciación, salario neto, objetivos de ahorro, interés compuesto y proformas inmobiliarias completas.
Home Buying & Mortgages
4 calculadorasFrom first offer to closing day: mortgage payments, refinance break-evens, rent-vs-buy, and home-equity lines of credit.
Loans & Debt Payoff
4 calculadorasPlan or pay down any loan: monthly payments, total interest, credit-card payoff timelines, and home-equity lines.
Retirement & Investing
4 calculadorasCompound your savings: 401(k) projections, investment ROI/CAGR, long-term compounding, and APR↔APY conversions.
Income & Taxes
4 calculadorasKnow what actually lands in your account: paycheck estimators, state-by-state take-home pay, 1099 SE tax, and hourly↔salary conversions.
Everyday Money
6 calculadorasFast tools for daily decisions: tipping, discounts, sales tax, inflation lookups, live currency, and cost-of-living comparisons.
Savings & Net Worth
3 calculadorasSet targets and track progress: monthly savings to hit a goal, full net-worth snapshot, and long-term compounding.
Safety Nets & Savings Vehicles
4 calculadorasBuild the buffer first: emergency-fund target, CD yield, monthly savings pace, and a snowball plan for existing debt.
Retirement Accounts & Investing
6 calculadorasCompare tax-advantaged growth: Roth IRA projections, 401(k) balance with employer match, compounding, ROI, and margin math.
Event & Big-Purchase Budgeting
3 calculadorasPlan one-off spends: full wedding budget breakdown, savings pace to fund it, and discount math on the big line items.
Rental Underwriting
4 calculadorasUnderwrite a rental in minutes: cap rate, cash-on-cash, gross & net rental yield, and full multifamily proformas.
Commercial Proformas
7 calculadorasAsset-class proformas for commercial real estate: multifamily, hotel, retail, office, industrial, and self-storage.
Flipping & Tax Strategy
3 calculadorasBuy right and defer gains: 70% rule for flips, 1031 exchange deferred gain and boot, and buyer closing-cost estimates.
Mixed-Use Proformas
4 calculadorasUnderwrite blended asset classes: retail with apartments, retail with offices, hotel with retail, and hotel with retail plus apartments.
Valuation Metrics
4 calculadorasQuick value checks appraisers and investors run first: gross rent multiplier, price per square foot, ARV, and cap rate.
Debt & Leverage
5 calculadorasLender-side metrics: loan-to-value, debt yield, commercial loan payments with balloon, break-even occupancy, and NNN lease costs.
Flipping & BRRRR
4 calculadorasValue-add strategies end to end: BRRRR refinance math, flip profit after all costs, the 70% rule, and after-repair value.
Selling & Closing Costs
4 calculadorasWhat you actually walk away with: seller net proceeds, agent commission splits, buyer closing costs, and annual property tax.
1031 Exchanges
3 calculadorasDefer the gain correctly: deferred-gain math, taxable boot, and the 45-day identification and 180-day closing deadlines.
Buying Power
3 calculadorasHow much house the numbers support: affordability by income and debts, price per square foot, and the property tax that follows.
Más herramientas de finanzas y dinero
Calculadoras de salud y fitness
Mide composición corporal, calorías diarias, hidratación, ciclos de sueño, hitos del embarazo y ritmo de entrenamiento — fórmulas respaldadas por la ciencia y sin registro.
Body Composition
5 calculadorasFive complementary lenses on body composition: BMI, body fat %, BRI, waist-to-height ratio, and ideal-weight ranges.
Nutrition & Energy
5 calculadorasBuild a daily nutrition plan: TDEE calories, BMR baselines, protein/carb/fat macros, hydration targets, and the deficit math for weight loss.
Fitness Performance
3 calculadorasTrain smarter: race pace, estimated one-rep max across five formulas, and personalized heart-rate training zones.
Pregnancy & Family
3 calculadorasPlan and track: ovulation and fertile window, pregnancy due date, current week of pregnancy, and your dog's age in human years.
Sleep & Recovery
2 calculadorasRecover well: bedtime / wake time built around 90-minute sleep cycles, plus daily hydration.
Everyday Activity & Cardio
4 calculadorasTrack movement and aerobic fitness: steps to miles or kilometers, running pace, and estimated VO2 max.
Muscle, Protein & Strength
4 calculadorasBuild and fuel lean tissue: daily protein target, lean body mass, macro split, and estimated one-rep max.
Health Risk Ratios
4 calculadorasScreening ratios clinicians actually use: waist-to-hip, waist-to-height, BMI, and body fat percentage.
Calculadoras de uso diario
Herramientas prácticas para estudios, proyectos del hogar y conversiones rápidas: GPA y notas, metros cuadrados y hormigón, conversión de unidades y porcentajes.
Grades & GPA
3 calculadorasTrack and target academic performance: cumulative GPA, weighted course grades, and the score you need on what's left.
Math Tools
9 calculadorasGeneral-purpose math: percentages, percent change, averages, proportions, slope/grade, fractions, descriptive statistics, and a full scientific calculator.
Geometry
6 calculadorasArea, circumference, surface area, and volume for circles, spheres, cylinders, cones, and rectangular prisms — with the formula on every page.
Statistics & Probability
12 calculadorasFrom z-scores and confidence intervals to t-tests, chi-square, correlation, regression, and the binomial/Poisson distributions — textbook-grade tools with worked examples.
Length & Sizing
8 calculadorasLengths and sizes: general unit conversions, m²↔ft² area, inches↔cm, and international shoe sizes.
Cooking & Temperature
4 calculadorasRecipes and ovens: cups/grams/ml/oz cooking conversions, Fahrenheit↔Celsius↔Kelvin temperature, plus dedicated ml↔oz and oz↔cups pages.
Vehicles & Symbols
3 calculadorasEveryday conversions: miles-per-gallon and trip fuel cost, plus Arabic↔Roman numeral conversion (1–3999).
Land & Area
2 calculadorasArea across systems: acres to square feet and hectares, plus square meters to square feet for lots, parcels, and floor plans.
Weight & Volume
6 calculadorasMetric↔imperial for mass and liquid: kilograms to pounds, liters to gallons (US and Imperial), millilitres to ounces, and ounces to cups.
Materials & Coverage
6 calculadorasBuy the right amount the first time: paint, wallpaper, tile, concrete, lumber, and mulch/gravel — with waste factors built in.
Area Planning
1 calculadoraPlan home projects by area: square-footage planner with material cost — pair with the materials cluster for paint, tile, mulch, and concrete totals.
Home Energy
1 calculadoraEstimate rooftop solar production, first-year savings, payback, and 25-year cumulative savings.
Parties & Catering
3 calculadorasHost without over- or under-buying: drinks per guest, food quantities, and full catering portions by service style.
Walls & Ceilings
4 calculadorasInterior surfaces done right: drywall sheets and mud, insulation R-value and batt counts, paint gallons, and wallpaper rolls.
Exterior & Structures
8 calculadorasOutdoor builds and replacements: roofing squares, fence panels and posts, deck boards and joists, and asphalt driveway tonnage.
Flooring & Masonry
4 calculadorasHard surfaces by the square foot: flooring boxes with waste factor, tile counts, brick or block quantities, and concrete yards.
Más herramientas de utilidades diarias
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