🏃 Calculators

Calculate BMI instantly — metric or imperial.

Live exchange rates for 160+ currencies.

Exact age plus totals and next birthday.

Calculate your BMR and daily calorie needs (TDEE).

Three live calculators for every percent problem.

Keyboard-friendly, with history.

Monthly payment, interest total, amortization schedule.

Estimate your baby's due date from your last period.

Calculate running pace, finish time, or distance — km & miles.

Future value with compound interest and deposits.

Split daily calories into protein, carb & fat grams.

Split bill and tip by party size instantly.

Find missing width/height or simplify any aspect ratio.

Final price and savings for any sale or stacked deal.

Birth date to all three Korean age systems.

Add or remove VAT / sales tax — net, tax and gross.

Trig, log, roots, factorial — safe offline evaluator.

Estimate monthly net pay after Korean taxes.

Weighted GPA from grades and credits, 4.0 or 4.5.

Bedtime or wake-up times based on 90-min sleep cycles.

Estimate your one-rep max from any set — six formulas plus a training weight table.

Your new average price after buying more, or the shares needed to hit a target.

Find the units needed to break even.

See how many months of cash runway you have left.

Calculate customer acquisition cost and payback months.

Convert your cat's age to human years (15 / 24 / +4 rule).

Days, weeks, months, years between two dates.

Daily calories and cups for your dog or cat (RER × activity factor).

Convert your dog's age to human years using the size-based AKC chart.

Estimate chocolate toxicity risk for dogs by weight, type and amount.

Estimate your dog's whelping (due) date from the breeding date — ~63 days.

Solve quadratic, linear, cubic and simultaneous equations with the working shown.

Find the score you need on your final exam to hit your target grade.

Add, subtract, multiply and divide fractions — simplified, mixed number and decimal.

Estimate unused annual-leave allowance from service years and ordinary wage.

Estimate withholding tax and net amount on a Korean bonus (payment-period method).

After-tax interest on Korean savings — 15.4% tax and maturity payout.

Convert hourly wage to monthly/weekly pay incl. Korean weekly holiday allowance.

Estimate monthly Korean income & local tax from the 2026 simplified withholding table.

Estimate Korean statutory severance pay from service dates and pay.

Estimate Korean unemployment benefit (구직급여): daily amount and benefit days.

Estimate customer LTV and your LTV:CAC ratio.

Find the selling price for a target profit margin.

Collateral ratio, cash shortfall and how many shares a forced sale takes.

Compute Net Promoter Score from 0–10 responses.

Odds over many tries: at least once, exactly k, expected count.

Estimate how big your puppy will get from its weight and age.

Pyeong ↔ m², plus supply / exclusive / common area breakdown.

Mean, median, mode, standard deviation, variance and quartiles from a list of numbers.

Compare price per unit across products.