IT1ST

Calculate a balance.
Pick an option.

Explore how savings could grow, or let a wheel pick from your list. Open a tool below to get started. No sign-up is needed.

Compound Interest Calculator

Estimate a balance over time using a starting amount, interest rate and duration. Compare daily, weekly, monthly or yearly compounding, with optional regular deposits.

Try it: compare saving a fixed amount each month with leaving your starting balance alone. Check the rate convention before calculating.

Estimates exclude fees, tax, inflation and changing returns. Currency selection formats amounts; it does not convert them.

Open interest calculator

Choice Wheel

Enter names, activities or other options and spin for a random pick. Paste a list from a spreadsheet, customise the wheel, and save named wheels in this browser.

Try it: add the activities your group is happy with, then spin to choose one. Each row has an equal chance.

Designed for casual decisions. It is not a certified prize draw. Saved wheels stay on this device and browser.

Open choice wheel

Choose a tool, make it your own

Enter your own values

Each tool explains its inputs, assumptions and limits. Calculator results are estimates, not guaranteed investment returns or personal financial advice.

Use a basic version without scripts

Both tools offer native forms when JavaScript is off. Submitting those forms sends your entries to Cloudflare for a temporary result. With JavaScript, calculations and draws run in your browser.

Built and maintained by IT1ST

IT1ST makes practical web utilities with explanations you can inspect. Found a problem or have a useful suggestion? Include the tool name and a non-sensitive example.