Calculators

Every formula shown, every assumption editable. Compare up to three scenarios.

Turkey thawing time

USDA guidance: about 24 hours per 4–5 lb in the fridge.

Distance ÷ speed, with optional daily limits.

How long a supply lasts at a steady rate of use.

Units of work ÷ (rate × people), in working days.

File size vs. connection speed, bits vs. bytes, decimal vs. binary.

Fill or drain time from volume and flow rate.

Monthly contributions with optional compound interest.

Balance, APR and fixed payment — detects payments that never pay it off.

Usable watt-hours ÷ load, with efficiency losses.

Energy needed ÷ charger power, with losses and the slow final stretch.

Fuel on hand ÷ consumption at your load.

Words ÷ reading speed.

Episodes × length, at your playback speed.

How many working hours a purchase costs after tax.

How long a balance lasts with regular withdrawals and growth.

Plants, hair, savings of patience — needs YOUR growth-rate range.

Physics floor for heating water — real time is longer due to heat loss.

Distance ÷ the speed of light (exact by definition).

A hypothetical classic.

Thought experiment only.