Add/subtract/multiply/divide/powers.

Percent of, what percent, increase/decrease.

Reduce a fraction + mixed number + decimal.

Average, sum, min, max from a list.

Cost per item or per unit.

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

Greatest common divisor and least common multiple.

Round a number to N decimals.

Check if an integer is prime.

Area and circumference from radius.

Area and perimeter from width/height.

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

Calculate alcohol by volume from original and final gravity. Includes standard and advanced formulas.

Calculate priming sugar (corn sugar, table sugar, DME, honey, maple) for bottle conditioning based on batch volume, temperature, and target carbonation.

Calculate strike water temperature and volume for infusion mashing. Accounts for grain weight, temperature, equipment loss, and absorption.

Calculate International Bitterness Units (IBU) using Tinseth, Rager, or Garetz formulas. Accounts for hop form, alpha acid, boil time, and gravity.

Calculate yeast cells needed and packages required based on batch volume, gravity, yeast type, viability, and starter. Supports ale and lager rates.

Convert between Brix, Specific Gravity, and Plato. Includes potential ABV estimate at 75% attenuation.

Calculate apparent and real attenuation from OG/FG, or predict FG from yeast attenuation rating. Includes ABV estimates.

Calculate total grain weight and per-grain amounts for a target OG, volume, and efficiency. Includes SRM color estimate via Morey formula.

Calculate boil-off rate, total evaporation, and required pre-boil volume. Work forward from volumes or backward from target rate.

Estimate beer calories from OG/FG or ABV. Breaks down alcohol vs carb calories. Supports oz/ml serving sizes.

Convert °C, °F, K.

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

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

Degrees ↔ radians.

Calculate fuel needed and trip cost from distance, efficiency, and fuel price.

Convert between major world currencies with custom exchange rates.

Convert between Nm, ft-lb, in-lb, and kgf·m torque units.

Calculate diameter, circumference, sidewall, and revs/km from tire code.

V/I/R + power.

Vout, current, resistor power.

Series resistor and power for an LED.

RC time constant and cutoff frequency.

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

Runtime from capacity and load current.

Tip amount and total bill.

Monthly payment + total interest.

Monthly PITI+HOA estimate.

Future value with monthly contributions.

Total = P + P·r·t.

Return on investment (%).

Compute margin% and markup% from cost and price.

Convert APR to APY with compounding.

PV of a future amount with discount rate.

FV from present value with rate.

Estimate months to payoff with fixed monthly payment.

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

Add or remove VAT/GST from an amount with custom rates.

Calculate monthly savings needed to reach a financial goal.

Future & present value of regular payments (ordinary or due).

Test if your portfolio can sustain withdrawals for retirement using the 4% rule.

See how extra monthly payments reduce loan term and interest.

Quick mental math: years to double, triple, or quadruple your money.

Calculate gross yield, net yield, and cash-on-cash return for rental properties.

Compare lump sum vs periodic investing. Calculate per-period investment amounts.

Calculate intrinsic value, time value, break-even, and total cost for call/put options.

Calculate future/past purchasing power with custom inflation rates.

Project your retirement savings and income based on age, contributions, and returns.

Calculate how much emergency savings you need and how long to build it.

Calculate months to become debt-free. Compare your payment vs minimum payment.

Compare current vs new mortgage. Calculate break-even point and lifetime savings.

Estimate your Social Security benefit at different claim ages (62-70).

Calculate your FIRE number, years to financial independence, and Coast FIRE.

Calculate federal tax, effective rate, and marginal bracket for 2024.

Compare salary purchasing power between US cities with cost of living adjustment.

Body mass index (US/Metric).

Calories/day estimate (Mifflin-St Jeor).

Karvonen zones from age + resting HR.

Simple daily water estimate by body weight.

Convert distance/time to pace and speed.

Calories burned from MET, weight, minutes.

Estimate 1RM from weight and reps.

Calculate BSA using Mosteller and Du Bois formulas.

Calculate UK units, US standard drinks, and calories from volume and ABV.

Estimate body fat percentage using US Navy circumference method (gender-specific).

Calculate daily protein needs based on weight, activity level, and fitness goals.

Calculate TDEE and macro split (protein/fat/carbs) based on lean mass and goals.

Calculate training volume (sets × reps × weight) with MEV/MAV/MRV landmarks.

Compare powerlifting strength across bodyweight classes.

Find which weight plates to load on a barbell.

Calculate 5/3/1 training max and working sets from your 1RM.

Estimate aerobic fitness (VO2 max) from heart rate.

See how your squat, bench, deadlift, and OHP compare to strength standards.

Days/weeks between two dates.

Unix seconds ↔ ISO date/time (local).

Add or subtract years, months, weeks, and days from a date.