Section II · 1192 tools
Calculators.
Mortgages, loans, interest, taxes, retirement, health, math, and the rest. Every tool computes in arbitrary precision and links its formula in plain language.
1192 calculators
Standard Equation Of A Circle Calculator
Calculate the standard circle equation (x−h)²+(y−k)²=r² by entering a center and radius, or a center and a known point on the circle.
Days Old Calculator
Calculate exactly how many days old you are by entering your birth date and a target date. Uses the Julian Day Number formula for precision.
Covid 19 Mortality Risk Calculator
Estimate COVID-19 mortality risk using age, sex, vaccination status, and up to 8 comorbidities. Powered by peer-reviewed epidemiological odds ratios.
Wedding Countdown Calculator
Free wedding countdown calculator. Enter your wedding date to instantly see the exact number of days remaining. Handles leap years and all calendar dates.
Tidal Volume Calculator (Lung Protective Ventilation)
Tidal Volume Calculator determines appropriate ventilation parameters using ideal body weight and lung-protective ventilation principles to reduce ventilator-induced lung injury.
Working Days Calculator
Count business days between any two dates, excluding weekends and US federal or state holidays. Accurate results for payroll, legal, and project deadlines.
Price Per Weight Calculator
Calculate price per pound, kilogram, ounce, or gram. Compare products across weight units to find the best value when shopping or buying in bulk.
Price Per Unit Calculator
Calculate price per unit from any total price and quantity. Compare package sizes, apply sales tax, and convert units to find the best value deal.
Time Adder Calculator
Add or subtract two time values in hours, minutes, and seconds and instantly display the total in HH:MM:SS, minutes, or decimal hours.
Vacation Countdown Calculator
Calculate exactly how many days, weeks, hours, or minutes remain until your vacation using precise Julian Day Number date arithmetic.
Price Per Round Calculator
Calculate cost per round, per box, or per case including shipping fees. Compare ammunition prices accurately to find the best value on every purchase.
Price Per Pound Calculator
Calculate price per pound from total cost and weight, find total cost from unit price, or determine how much weight a budget can buy. Supports lb, oz, kg, and g.