🧮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
Tae Kwon Do Score
Estimates tae kwon do score adding body kicks, head kicks and punches.
Archery Score
Estimates total archery score summing points per arrow.
Sport Shooting Score
Estimates sport shooting score adding 10s, 9s and other points.
Modern Pentathlon Score
Estimates the sum of scores in the 5 modern pentathlon events.
Decathlon Score
Estimates the sum of scores in the 10 decathlon events.
Heptathlon Score
Estimates the sum of scores in the 7 heptathlon events.
Portuguese Classical Sonnet Verses
Calculates total verses in a set of classical Portuguese sonnets.
Japanese Haiku Verses
Calculates total verses in a set of haiku poems (3 verses each).
Japanese Tanka Verses
Calculates total verses in a set of tanka poems (5 verses each).
Portuguese Quatrain Verses
Calculates total verses in a set of Portuguese quatrains (4 verses each).
Brazilian Cordel Verses
Calculates total verses in cordel pamphlets (6 or 10 verses per stanza).
Portuguese Trova Verses
Calculates total verses in Portuguese trovas (4 verses each).
Portuguese Classical Canto Verses
Calculates total verses in a Portuguese classical canto with ottava rima stanzas.
Russian Classical Short Story Pages
Estimates average pages in a Russian classical short story by words per page.
BW Film Development Time by Temperature
Estimates B&W film development time adjusted by developer temperature.
C41 Color Development Time by Temperature
Estimates C41 color film development time by bath temperature.
E6 Slide Development Time by Temperature
Estimates E6 slide film development time by bath temperature.
Film Fixer Quantity by Rolls
Estimates ml of fixer required by number of 35mm rolls.
Film Developer Quantity by Type
Estimates ml of developer needed by rolls and film type.
Film Bath Aeration Time
Estimates total agitation time during film development.
Film ISO Light Speed Relation
Calculates equivalent shutter speed when changing film ISO.
ASA ISO DIN Equivalence
Converts film sensitivity between ASA ISO and DIN scales.
BW Photo Paper Print Time
Estimates exposure seconds to print on B&W photo paper.
Photo Paper Sheets by Area
Estimates how many photo paper sheets cover a target area.
Photo Paper Chemicals Liters
Estimates liters of chemicals needed to process photo paper.
Photo Paper Drying Time by Type
Estimates air drying time for photo paper by type.
35mm Roll Average Sheets
Estimates contact prints and enlargements from a 36-pose 35mm roll.
EV Range by Battery kWh
Estimates EV range in km by usable battery kWh.
Hybrid Vehicle Range by Mode
Estimates total hybrid range combining fuel and battery.
EV Charging Time by Charger
Estimates EV charging hours by charger power.
EV DC Fast Charging Time
Estimates EV DC fast charging time from 10 to 80 percent.
EV Home Charging Time 12kW
Estimates home charging hours up to 12 kW.
EV kWh per 100km
Calculates average kWh per 100km for an electric vehicle.
Hybrid kWh per 100km
Calculates kWh per 100km for the electric portion of a hybrid.
EV vs ICE Annual Savings
Estimates annual savings of an EV versus an ICE vehicle.
Hybrid vs ICE Annual Savings
Estimates annual savings of a hybrid versus a pure ICE.
EV CO2 Emissions by Source
Estimates annual CO2 emissions of an EV by grid source.
Hybrid Annual CO2 Emissions
Estimates annual CO2 emissions for a hybrid vehicle.
EV Battery Degradation Years
Estimates remaining EV battery capacity after N years.
EV Battery Replacement Cost Years
Estimates amortized annual cost of EV battery replacement.
Epidemic Incidence per 100k
Calculates incidence rate per 100k from new cases and at-risk population.
Disease Prevalence per 100k
Calculates disease prevalence per 100k from total cases and population.
Disease Lethality Percent
Calculates disease lethality percent from deaths and cases.
Disease R0 Basic Reproduction
Estimates R0 by contacts, transmission probability and infectious duration.
Disease Rt Effective Reproduction
Estimates Rt from R0 and susceptible population fraction.
Disease IFR Infection Fatality Rate
Calculates IFR from deaths and estimated infections.
Outbreak Attack Rate
Calculates outbreak attack rate from ill and exposed counts.
Vaccine Coverage Percent
Calculates vaccination coverage percent of target population.
Herd Immunity Percent
Calculates herd immunity threshold from R0.
Vaccine Doses per Person
Estimates total doses required to immunize a population.
Pandemic Wave Peak Time Days
Estimates days to pandemic wave peak by R0 and generation time.
Sweden Christmas Luminaria Date
Computes Saint Lucia day date in Sweden by year.
Norway Christmas Luminaria Date
Computes Saint Lucia day date in Norway by year.
Jewish First Shabbat Date
Computes the first weekly Shabbat of the civil year.
Jewish Tu BiShvat Date
Computes approximate Tu BiShvat date in Gregorian calendar.
Jewish Purim Date
Computes approximate Purim date in Gregorian calendar.
Jewish Shavuot Date
Computes approximate Shavuot date in Gregorian calendar.
Jewish Sukkot Date
Computes approximate Sukkot date in Gregorian calendar.
Jewish Yom Kippur Date
Computes approximate Yom Kippur date in Gregorian calendar.
Tamil Pongal India Date
Computes Tamil Pongal festival date in India.