🧮Calculators
Calculators cover finance, health, math, physics, engineering and everyday life: interest and loans, net salary, BMI, rule of three, conversions and more. Results are informational and educational — for important decisions, confirm with a professional and official sources.
2826 tools
Star Distance Modulus Calculator
Computes distance modulus m - M and equivalent distance in parsecs from apparent and absolute star magnitudes.
Distance in Parsec from Magnitude
Calculates distance in parsec and light-years from a stars distance modulus (m - M).
Star Color Temperature Calculator
Estimates effective star temperature in Kelvin from the B-V color index using Ballesteros approximation.
Star Bolometric Luminosity Calculator
Computes star bolometric luminosity in watts and in solar luminosities from radius in solar radii and effective temperature.
Galactic Jeans Mass Calculator
Calculates approximate Jeans mass of an interstellar cloud from temperature in Kelvin and density in particles per cm3.
Planet Escape Velocity Calculator
Calculates surface gravitational escape velocity of a planet in km/s from its mass in kg and radius in km.
Kepler Orbital Period Calculator
Applies Kepler third law to compute orbital period in years from semi-major axis in AU and total system mass in solar masses.
Asteroid Mean Density Calculator
Computes mean density of an asteroid in g/cm3 from mass in kg and mean diameter in km assuming spherical geometry.
Planet Surface Gravity Calculator
Computes surface gravity acceleration of a planet in m/s2 and in Earth-g from mass in kg and radius in km.
Planet Rotation Time Calculator
Computes equatorial tangential velocity of a planet in km/h from radius in km and rotation period in hours.
Sumerian Zodiac by Date
Returns the Sumerian zodiac sign (Mul.Apin) corresponding to a date given in YYYY-MM-DD format.
Wind Chill Temperature Calculator
Computes wind chill temperature in Celsius using the North American formula from air temperature and wind speed in km/h.
Relative Humidity from Dew Point
Computes air relative humidity percentage from dry-bulb temperature and dew point in Celsius.
Barometric Atmospheric Pressure by Altitude
Estimates atmospheric pressure in hPa at an arbitrary altitude in meters using the simplified standard atmosphere formula.
Wind Gust to Mean Ratio
Computes the gust factor G/U and the mean wind speed from the gust velocity and the ratio entered.
Cumulative Rainfall in mm per Hour
Sums cumulative precipitation in mm from a list of hourly values separated by commas and computes mean and peak.
Rain Intensity in mm per Hour
Classifies rain intensity (light, moderate, heavy, very heavy) from precipitation rate in millimeters per hour.
Snow mm to cm Ratio Calculator
Converts rain-equivalent millimeters to centimeters of snow applying the typical regional snow liquid ratio (SLR).
Lightning Distance by Thunder Delay
Calculates distance in km and miles to a lightning strike from the seconds between flash and thunder using sound speed.
Lightning Frequency per km2
Computes lightning density per km2 per year from the total observed strikes, the area in km2 and the time interval.
Class A Pan Evaporation Calculator
Estimates reference evapotranspiration ETo in mm/day applying the Class A pan coefficient Kp to a measured evaporation.
Incident Solar Radiation W per m2
Estimates incident solar irradiance in W per m2 at ground level from the solar constant and the cosine of the zenith angle.
Wind Direction Degrees to Cardinal
Converts a wind direction angle in degrees (0 to 360) to the approximate cardinal direction across 16 sectors.
Virtual Temperature from Humidity
Computes virtual temperature in Kelvin from air temperature in Kelvin and water vapor mixing ratio in kg per kg.
Lens Field of View by Focal and Sensor
Computes horizontal, vertical and diagonal angle of view of a lens from focal length in mm and sensor size in mm.
Hyperfocal Distance by Aperture
Computes hyperfocal distance in meters for sharp infinity from focal length in mm, f-number and circle of confusion in mm.
Exposure Time by ISO and Aperture
Calculates a new exposure time in seconds when ISO and f-number change while keeping the same EV as a reference exposure.
Lens f-number by Focal and Diameter
Computes lens f-number from focal length in mm and effective entrance pupil diameter in mm using the relation N = f/D.
Lens Diffraction Diaphragm mm
Computes the Airy disk diameter in micrometers in a photographic lens from the f-number and the wavelength in nanometers.
Illuminance from Lumens and Area
Computes illuminance in lux from luminous flux in lumens and illuminated area in m2 via E = phi / A.
Distance for Lux Illuminance from Watt
Estimates the distance from a point source in meters to reach a target lux level from luminous intensity in candelas using inverse-square law.
Depth of Field and Circle of Confusion
Computes total depth of field in meters between near and far limits from focal length, f-number, subject distance and circle of confusion.
Chromatic Aberration of Lens
Estimates longitudinal chromatic aberration in micrometers between two wavelengths from the Abbe number and the focal length of the lens.
CCT Kelvin to Mireds Calculator
Converts correlated color temperature CCT in Kelvin to mireds and computes the mired shift between two photographic light sources.
Photo EV from ISO Aperture Time
Computes exposure value EV from a combination of ISO, f-number and exposure time using EV100 = log2(f2/t) - log2(ISO/100).
Shutter Priority Aperture and ISO
Computes the equivalent f-number when shutter speed or ISO is changed in shutter priority mode while keeping exposure constant.
CLT Brazilian Severance Notice Calculator
Computes proportional indemnified prior notice on Brazilian CLT termination from gross monthly salary and full years of service (3 extra days per year after the first).
CLT FGTS 40 Percent Severance Fine Calculator
Computes the 40% FGTS severance fine on Brazilian CLT termination without cause given the worker FGTS balance.
CLT Brazilian 13th Salary Calculator
Computes proportional Brazilian CLT 13th salary from gross monthly wage and months worked (full months with at least 15 days).
CLT Vacation One Third Sold Calculator
Computes the value of selling one third of Brazilian CLT vacation days (abono pecuniario) including the constitutional 1/3 bonus.
CLT Night Shift Bonus Calculator
Computes the 20% Brazilian night shift premium (22h to 5h) using reduced 52 min 30 s urban night hour and given hourly wage.
CLT Hazard Pay Bonus Calculator
Computes the 30% Brazilian CLT hazard pay (periculosidade) bonus on base salary for workers under NR 16 risk activities.
CLT Unhealthiness Bonus by Degree Calculator
Computes Brazilian CLT unhealthiness bonus of 10, 20 or 40 percent on the minimum wage per NR 15 degree (low, medium, max).
CLT Overtime 50 and 100 Percent Calculator
Computes Brazilian CLT overtime with 50% surcharge on weekdays and 100% on Sundays and holidays from the regular hourly wage.
CLT Optional Union Monthly Fee Calculator
Computes the optional Brazilian CLT union monthly fee (as percent of category floor or flat amount) authorized by the worker.
CLT Category Salary Floor Comparator
Compares a Brazilian CLT employee wage with the union category floor (piso salarial) from the CCT and shows the difference.
CLT Transport Voucher 6 Percent Discount Calculator
Computes the 6% maximum payroll deduction for Brazilian CLT transport voucher (vale transporte) and the effective discount vs real transport cost.
CLT Meal Voucher CCT Discount Calculator
Computes the Brazilian CLT meal voucher (vale refeicao) payroll discount using the category CCT percent on the total monthly benefit.
CLT Maternity and Paternity Leave Calculator
Computes Brazilian CLT maternity (120 default or 180 Empresa Cidada) and paternity (5 default or 20 extended) leave duration from a starting date.
Tesouro Prefixado Bond Yield Calculator
Computes gross yield of a Brazilian Tesouro Prefixado bond from invested amount, annual contracted rate and years to maturity.
Tesouro Selic Bond Yield Calculator
Estimates gross yield of a Brazilian Tesouro Selic bond from invested amount, average annual Selic rate and years to maturity or redemption.
Tesouro IPCA Plus Yield Calculator
Estimates gross yield of a Brazilian Tesouro IPCA bond combining annual real coupon with expected IPCA inflation over the given years.
Fixed Income CDI Percentage Yield Calculator
Computes the annual gross yield of a fixed income product contracted as a percent of the Brazilian CDI from CDI rate and offered percent.
CDB Regressive Income Tax Yield Calculator
Computes net yield of a Brazilian post-fixed CDB applying the regressive IR table (22.5 down to 15%) based on holding period in days.
Brazilian REIT FII Tax Free Income Calculator
Computes the monthly tax-free dividend distributed by a Brazilian REIT (FII) from the number of shares held and per-share distribution amount.
Brick FII Vacancy and Rental Income Calculator
Computes the effective rental income of a Brazilian brick FII from theoretical total rent and portfolio vacancy rate in percent.
FII Cap Rate Calculator
Computes annualized cap rate of a Brazilian REIT (FII) dividing annual net operating income (NOI) by the portfolio asset value.
Stock PE Forward PE and PB Ratio Calculator
Computes price to earnings (P/E), forward P/E and price to book (P/B) fundamentals of a stock from current price, EPS and book value per share.
EBITDA Margin Calculator
Computes EBITDA margin percent of a company from annual EBITDA and net revenue, useful for operating performance analysis.
Stock Dividend Payout Ratio Calculator
Computes the payout ratio of a listed company from annual dividends paid and net income earned in the same period.