🧮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.
2904 tools
Bulb Exposure ISO Aperture
Estimates bulb exposure time from scene EV with given ISO and aperture.
Time Lapse Intervalometer Seconds
Computes interval between shots for a time lapse with target final length and FPS.
Star Trails Rule 500
Computes max exposure to avoid star trails via the 500 rule.
Radio Band L Frequency
Converts wavelength to GHz inside L band (1-2 GHz) for radio astronomy.
Radio Band S Frequency
Convert wavelength to frequency (GHz) within the radio S band (2 to 4 GHz). Useful for radar, satellites, Wi-Fi and telecommunications.
Radio Band C Frequency
Convert wavelength to frequency (GHz) within the radio C band (4 to 8 GHz). Useful for satellite communication, radar and telecommunications.
Radio Band X Frequency
Converts wavelength to GHz inside X band (8-12 GHz).
Radio Band Ku Frequency
Converts wavelength to GHz inside Ku band (12-18 GHz).
Radio Band Ka Frequency
Converts wavelength to GHz inside Ka band (27-40 GHz).
Radio Brightness Temperature Jansky
Estimates brightness temperature from flux in Jansky and source angular size.
Jansky to Microwatt per m2
Converts flux density from Jansky to microwatts per square meter per Hz.
Radiotelescope Resolution Arcsec
Applies 1.22 lambda/D to compute radiotelescope angular resolution in arcsec.
Interferometry Baseline Resolution
Computes interferometer angular resolution lambda over B in arcsec.
CMB Temperature Radio Approx
Computes approximate spectral intensity of the CMB at a given frequency.
Pulsar Distance by DM
Estimates pulsar distance from Dispersion Measure assuming mean electron density.
Radio Link Budget Calculator
Calculate the link budget of a radio link in dB by adding transmit power and gains, then subtracting path losses. Useful for radio communication projects.
Amazon River Route Distance
Estimates distance in km along the Amazon River between port cities.
Amazon Riverboat Speed
Computes effective riverboat speed considering Amazon River current.
Amazon Ferry Crossing Time
Estimates ferry or barge crossing time in hours along the Amazon.
Brazil Coast Distance km
Estimates distance in km along Brazil 7491 km coastline.
Sailboat Speed Apparent Wind Knots
Estimates sailboat hull speed from waterline length in knots.
Jangada Wind Speed Knots
Estimates Brazilian jangada speed in knots from apparent wind speed.
Tide High Low Interval Brazil
Computes interval between high and low tide on Brazilian coast (semidiurnal 12h 25min).
Pilotage Time Large Port Brazil
Estimates average pilotage time at large Brazilian ports such as Santos and Itaqui.
Yacht Marina Distance Brazil
Estimates yacht distance in nautical miles between Brazilian marinas.
Open Sea Fishing Time Brazil
Estimates open sea fishing trip hours by distance from shore and boat speed.
Sail Race Yacht Sea Distance
Estimates nautical miles in Brazilian coastal yacht races.
Windsurf Wind Speed Knots
Estimates windsurf speed in knots based on wind speed.
Daily Protein Intake Calculator
Calculate how many grams of protein to eat per day based on your weight (about 1.6 g per kg). Ideal for athletes who want to build or keep muscle.
Carbs per Day Training Weight
Computes carbohydrate grams per day from training intensity and body weight.
Fat per Day Healthy Weight
Estimates fat grams per day on a healthy diet (~25% of calories).
Essential Amino Acids Table
Shows daily requirement of 9 essential amino acids in mg per kg of weight.
Leucine Supplement Muscle
Computes grams of leucine per meal to trigger muscle protein synthesis.
Creatine Loading Phase Grams
Computes creatine loading phase dose by body weight plus maintenance.
Pre-Workout Caffeine Calculator
Calculate the ideal pre-workout caffeine dose for your body weight (about 3 to 6 mg per kg). Tune the amount to boost focus and performance without overdoing it.
Omega-3 Dose Calculator
Calculate the recommended daily omega-3 dose (EPA + DHA) according to your age and goal. Know how much to supplement for heart and brain health.
Vitamin D3 Dose Calculator
Calculate the daily vitamin D3 dose in IU based on your sun exposure and skin tone. Adjust supplementation to keep healthy levels year round.
Iodine per Day from Salt
Computes iodine intake per day from grams of iodized salt consumed.
Daily Iron Requirement
Calculate your daily iron requirement in mg according to sex and age. Important for preventing anemia, especially in women and during pregnancy.
Daily Magnesium Requirement
Calculate your daily magnesium requirement in mg according to sex and age. This mineral is essential for muscles, nerves and good sleep quality.
Roof Cover Area by Slope
Computes real roof cover area from projected area and slope in degrees.
Roof Tiles Count by Area
Estimates roof tiles needed per square meter by type.
Gutters & Flashings Calculator
Calculate how many linear meters of gutters and flashings to buy for a roof from its perimeter. Size the right material for rainwater drainage.
Gable Flashing by Height
Estimates meters of gable flashing from length and gable height.
Residential Septic Tank Size
Estimates septic tank useful volume by NBR 7229 from number of residents.
Residential Cistern Size
Estimates household water cistern volume by residents and days of autonomy.
Residential Pool Volume
Computes rectangular pool volume from length, width and depths.
Laundry Room Size
Estimates minimum residential laundry area by equipment count.
Bedroom Size by Bed
Estimates minimum bedroom area by bed size and circulation clearances.
Ceiling Height Brazil Standard
Checks ceiling height vs typical Brazilian municipal code by room.
Accessible Corridor Width Brazil
Checks corridor width against NBR 9050 accessibility standard.
Staircase Steps Brazil
Computes number of steps, tread and riser by Blondel formula adapted to Brazil.
Bathroom Size Brazil
Estimates minimum bathroom area by planned fixtures.
City Patron Saint Feast Date
Shows fixed feast date of a city patron saint by code.
Cirio de Nazare Date Calculator (Belem, Brazil)
Type any year from 1900 to 2200 and get the exact October date of Brazil's largest Catholic procession, held in Belem do Para on the second Sunday.
Iemanja Feast Date
Shows traditional Iemanja feast dates in Salvador and Rio.
Bom Jesus and Aparecida SP Date
Shows fixed dates for Aparecida and Bom Jesus dos Passos pilgrimage.
Lent and Easter Brazil
Computes Ash Wednesday, Easter and Lent period for the year.
Corpus Christi Brazil
Computes Corpus Christi date (60 days after Easter).
Finados Brazil Date
Shows Finados (All Souls Day, Nov 2) and weekday for the year.