Battery Life Calculator
How long a phone, power bank, or gadget battery will last — and how many charges a power bank gives.Travel Budget Calculator
Add flights, stays, food, and activities to see your total trip cost and cost per person per day.Currency & Crypto Converter
Convert Bitcoin, Ethereum, and 100+ coins — or USD, INR, EUR, and more — at today’s rates.Crypto Profit Calculator
See your profit or loss, ROI, and break-even price after fees on any crypto trade.Why these tools are free
Nionenad is supported by advertising and clearly labeled affiliate links. The tools run entirely in your browser, so we never see what you enter — not even the text or code you paste.