Free online tools and calculators
Calculate, convert and format data in seconds, no sign-up required.
Popular tools
Compound interestEstimate the future value of an investment with compounding interest and optional regular contributions.LoanSimulate the monthly payment, total cost and amortization schedule of a loan in seconds.Sleep cyclesCalculate the best bedtimes or wake-up times based on indicative 90-minute sleep cycles.VAT (Net/Gross)Instantly convert an amount between net, VAT and gross.BMICalculate your Body Mass Index and its standard classification.Business daysCount the number of business days between two dates, optionally excluding French public holidays.
Money & finance
Interest, loans, salaries, VAT, discounts and everyday budgeting.
Dates & time
Deadlines, business days, age, weeks, sleep and work hours.
Math
Cross-multiplication, averages, ratios, fractions and proportions.
Conversions
Length, weight, temperature, speed and data units.
Cm ↔ inchesFeet/inches ↔ cmKg ↔ lbsCelsius ↔ Fahrenheitkm/h ↔ mphkW ↔ horsepowerLiters ↔ gallonsNautical miles ↔ kmKilometers ↔ milesMeters ↔ feetMeters ↔ yardsMillimeters ↔ inchesm² ↔ ft²Hectares ↔ acresHectares ↔ m²Liters ↔ millilitersLiters ↔ m³mL ↔ fl ozGrams ↔ ouncesTonnes ↔ poundsBar ↔ PSIKnots ↔ km/hm/s ↔ km/hWatts ↔ BTU/hkcal ↔ kJJoules ↔ caloriesRadians ↔ degreesNM ↔ miles
Cars & transport
Fuel consumption, trip cost, range and tires.
Sport & body measurements
BMI, running pace and time projections.
Home & DIY
Areas, volumes, paint, tiling and concrete.
Developer tools
Epoch timestamps, HTML colors, numeric bases, encoding and format conversions.