🧮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
Turtle Lifespan
Shows turtle lifespan by species.
Parrot Lifespan
Shows parrot lifespan by species.
Blue Whale Lifespan
Shows blue whale lifespan estimate.
Cheetah Speed
Shows cheetah average and maximum running speed.
Golden Eagle Speed
Shows golden eagle gliding and stooping speeds.
Peregrine Falcon Speed
Shows peregrine falcon stooping/hunting dive speed.
Swallow Migration Distance
Shows swallow yearly migration distance by species.
Gray Whale Migration
Shows gray whale yearly migration distance in the Pacific.
Tropical Birds Body Temperature
Shows tropical bird body temperature in Celsius by species.
Octopus Hearts
Shows the number of octopus hearts and their function.
Dog vs Human Chromosomes
Shows dog and human chromosome counts side by side.
CDB Gross vs Net (Regressive Tax)
Computes gross and net CDB yield applying Brazilian regressive income tax by tenor.
LCI/LCA vs CDB with the Income Tax Table
Compares tax-free LCI/LCA gross rate with equivalent CDB for the same tenor — investment decision.
Tesouro Prefixado Unit Price (PU)
Computes Tesouro Prefixado unit price (PU) given rate and business days to maturity.
Tesouro IPCA+ Yield
Estimates real and nominal yield of Tesouro IPCA+ over the period given projected inflation.
SAC Extra Amortization Simulator
Simulates interest savings and term reduction when making monthly/yearly extra amortization in SAC.
Credit Card Revolving Cost
Computes accrued interest and Brazilian IOF on credit card revolving balance with monthly rate and days.
Social Security Contribution Time
Sums total Brazilian RGPS contribution time from a list of work periods with start/end dates.
Pesach Jewish Passover Date
Shows the approximate Pesach (Jewish Passover) date for upcoming years.
Ramadan Start Date
See the approximate start date of Ramadan, the holy fasting month of the Islamic calendar, for the coming years.
Diwali Festival Date
Shows the approximate Diwali (Hindu festival of lights) date for upcoming years.
Holi Festival Date
Shows the approximate Holi (Hindu colors festival) date for upcoming years.
Chinese New Year and Zodiac
Find out the date of Chinese New Year and which zodiac animal (rat, ox, tiger, dragon...) rules each of the coming years.
Orthodox Christmas Date
Shows the Russian Orthodox Christmas date (Julian calendar).
Losar Tibetan New Year
Shows the Losar (Tibetan New Year) date for upcoming years.
Vesak Buddhist Festival
Shows the Vesak (Buddhist festival of lights) date for upcoming years.
Chuseok Korean Festival
Shows the Chuseok (Korean harvest festival) date for upcoming years.
Seollal Korean New Year
Shows the Seollal (Korean Lunar New Year) date for upcoming years.
Obon Japanese Festival
Shows the Obon (Japanese ancestor festival) date for upcoming years.
Tet Vietnamese Festival
Shows the Tet (Vietnamese Lunar New Year) date for upcoming years.
Spell Casting Time
Estimates average minutes to cast a spell by category.
Potion Ingredients Count
Estimates number of ingredients in a classic potion by effect.
Dragon Egg Incubation
Estimates days of incubation for a dragon egg by species.
Werewolf Full Moon Nights
Computes nights of werewolf transformation per year (13 full moons).
Vampire Years
Computes years as a vampire since the year of transformation.
Silver Bullets for Werewolf
Estimates silver bullets needed to kill a werewolf by size.
Garlic Vampire Defense
Estimates garlic cloves needed to defend an area against vampires (2 per m2).
Fairy Portal Encounter
Estimates minutes to find a fairy portal in the forest by density.
Unicorn Encounter Forest
Estimates days to encounter a unicorn in an enchanted forest by pilgrim purity.
Home Magic Portal Walk
Computes minutes on foot between home and a magic portal at 80 m/min.
Genie Grant Wish Time
Estimates seconds for a genie to grant a wish by difficulty.
Witch Broom Flight km
Computes minutes of witch broom flight per km at 60 km/h.
Mage Magic Recovery Time
Estimates hours for a mage to recover magic by level.
Keynesian Multiplier
Computes the keynesian multiplier k=1/(1-MPC) from marginal propensity to consume.
GDP by Expenditure C+I+G+X-M
Computes GDP by expenditure summing consumption, investment, government, and net exports.
Trade Balance Surplus or Deficit
Calculate a country trade balance by subtracting imports from exports and see whether there is a surplus or deficit. A handy tool for studying economics.
GDP Deflator Real vs Nominal
Calculate the GDP deflator from nominal and real GDP and measure the overall inflation of an economy. Essential in macroeconomics and national accounts.
Real Interest Rate (Fisher)
Calculate the real interest rate by stripping out inflation with the Fisher equation: (1+r) = (1+i)/(1+π). See an investment true return above inflation.
Real Effective Exchange Rate (REER)
Computes the real effective exchange rate weighted by inflation.
Purchasing Power Parity (PPP)
Calculate purchasing power parity (PPP) between two currencies by comparing the price of equivalent goods. Understand the real exchange rate beyond the market.
Phillips Curve Inflation vs Unemployment
Shows the Phillips curve relationship: inflation = expected inflation - beta*(unemployment - natural).
Laffer Curve Tax vs Revenue
Shows tax revenue estimated by the Laffer curve R=t*(1-t)*B with normalized base.
Money Velocity MV=PY
Computes money velocity V via the quantity equation MV=PY.
Savings Investment Identity
Checks accounting identity S=I in closed economy.
Savings Income MPC MPS
Computes total and marginal savings from income using MPC and MPS=1-MPC.
MDF Panel Screws Count
Estimates screws needed to fix an MDF panel by area.
Wood Nails by Size
Estimates nails per linear meter of wood by nail size.
Wall Anchors by Hole
Estimates plastic anchors per hole by hole size.
Washers per Screw
Estimates washers needed for through-bolts in DIY assemblies.
Garden Hose Length
Estimates meters of hose needed for a path with safety margin.