Degrees ↔ radians.

Convert J/kJ/Wh/kWh/cal/kcal/BTU.

Convert mm/cm/m/km/in/ft/yd/mi.

Convert mg/g/kg/oz/lb.

Convert Pa/kPa/bar/psi/atm.

Convert m/s, km/h, mph, knots.

Convert °C, °F, K.

Convert mL/L/m^3/US gal/US qt/ft^3.

Convert APR to APY with compounding.

Units to break even: fixed / (price - variable).

Future value with monthly contributions.

Estimate months to payoff with fixed monthly payment.

FV from present value with rate.

Monthly payment + total interest.

Compute margin% and markup% from cost and price.

Monthly PITI+HOA estimate.

PV of a future amount with discount rate.

Return on investment (%).

Add/remove sales tax.

Total = P + P·r·t.

Tip amount and total bill.

Area and circumference from radius.

Area and perimeter from width/height.

Average, sum, min, max from a list.

Add/subtract/multiply/divide/powers.

Reduce a fraction + mixed number + decimal.

Greatest common divisor and least common multiple.

Percent of, what percent, increase/decrease.

Compute x^n and n-th root of x.

Check if an integer is prime.

Solve a:b = c:d for missing value.

Round a number to N decimals.

Cost per item or per unit.

Runtime from capacity and load current.

Time to reach a target % of final voltage in RC.

Series resistor and power for an LED.

V/I/R + power.

RC time constant and cutoff frequency.

Vout, current, resistor power.

Body mass index (US/Metric).

Calories/day estimate (Mifflin-St Jeor).

Estimate body fat % from measurements.

Calories burned from MET, weight, minutes.

Karvonen zones from age + resting HR.

Convert macro % to grams/day.

Estimate 1RM from weight and reps.

Convert distance/time to pace and speed.

Simple daily water estimate by body weight.

Days/weeks between two dates.

Unix seconds ↔ ISO date/time (local).