Free Online Calculators for Everyday Math & Money
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All toolsCalculate percentages, proportions, and percentage change with a clear formula breakdown.
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Calculate a value after a percentage increase and see the exact increase amount.
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All categoriesMathPercentages, fractions, averages and everyday arithmetic.15 toolsFinanceLoans, interest, savings, tax and business numbers.15 toolsHealth & FitnessBody measurements, calories, pregnancy and fitness targets.5 toolsConversionsLength, weight, temperature, volume and more.8 toolsEverydayDates, time, travel and other daily helpers.15 toolsCareerCompare pay, benefits, work time, commuting, and job offers.10 toolsHomeMaterials, project quantities, room sizing and home planning estimates.9 toolsDeveloper ToolsBrowser-based formatters, encoders, validators and developer utilities.13 toolsText ToolsPrivate browser-based counters, cleaners, converters and comparison tools.9 toolsProfessional & IndustryCited calculators for engineering, manufacturing, quality, project, cloud and finance professionals.148 toolsElectricalOhm's law, power, batteries, voltage drop and AC power calculators.16 toolsMechanicalForce, torque, stress, beams, gears and bearing life calculators.16 toolsFluidFlow, pipe velocity, Reynolds number, pressure drop and pump calculators.6 toolsThermal & HVACHeat transfer, heating and cooling loads and energy cost calculators.5 toolsConstructionQuantities, labor and equipment hours, cost, bids, change orders and retainage.14 toolsEarned ValuePV, EV, AC, variances, CPI, SPI and every documented EAC model.13 toolsProject EstimationLabor, duration, capacity, team size, budget, contingency and forecasts.9 toolsAgile DeliveryVelocity, capacity, release forecasts and flow metrics for a single team.7 toolsPMOPortfolio cost, capacity, ROI, prioritization and budget variance.5 toolsInventoryEOQ, reorder point, safety stock, turnover, service level and fill rate.11 toolsProcurementPurchase and landed cost, supplier comparison, price variance, savings and TCO.8 toolsLogisticsFreight, fuel, driver, vehicle, trip, delivery, warehouse and 3PL costs.14 toolsSupply ChainDemand forecasting, lead-time demand, capacity and storage planning.7 toolsAccounting & CostingCOGS, gross margin, contribution margin, break-even, markup and margin.11 toolsCorporate FinanceROI, ROIC, NPV, IRR, payback, working capital and liquidity ratios.14 toolsFP&ARevenue and expense forecasts, budget variance, headcount, cash flow, burn and runway.8 toolsBusiness PricingProduct and service pricing, target margin and unit economics — markup kept separate from margin.4 toolsPersonal FinanceSIP and investment growth, inflation and net worth calculators.3 toolsTaxUS and India income tax and take-home pay estimators, from official published rates.4 toolsSalesQuota, commission, win rate, pipeline coverage, sales velocity, ARR/MRR and forecast calculators.13 toolsCustomer EconomicsCAC, LTV, payback, retention, churn and ARPU calculators — no assumed benchmarks.10 toolsMarketingCPM, CPC, CPA, CTR, ROAS, campaign break-even, media budget, reach and frequency calculators.9 toolsSaaSMRR and ARR growth, expansion, new logo revenue, burn multiple and SaaS break-even calculators.6 toolsWorkforceFTE, headcount, overtime, shift differential, staffing requirement, productivity and labor cost per unit calculators — no built-in legal or tax rates.7 toolsHR MetricsTurnover, absence, cost per hire, time to fill, offer acceptance, retention, internal mobility and training cost calculators.8 toolsStaffingRequired staff, shift staffing, coverage, workload capacity, billable staffing and contractor cost calculators.7 toolsEnergyElectricity cost, motor, pump, fan, compressor, generator, solar, payback, thermal energy and boiler efficiency calculators — no built-in energy prices.11 toolsFacilitiesHVAC load, lighting energy and building energy cost calculators.3 toolsData CentersPUE, IT and facility load, cooling energy, rack power and data center energy cost calculators — no built-in benchmarks.8 toolsHealthcare OperationsOccupancy, length of stay, staffing, readmission and cost calculators with explicit counting rules. No diagnosis, treatment or reimbursement advice.10 toolsLife SciencesMolarity, dilution, molecular weight, concentration, reaction yield and production costs. Educational laboratory calculations only.6 toolsStatisticsMean, variance, probability, weighted mean, median, standard error, confidence intervals, z scores, regression, correlation and uncertainty.10 tools