tools
Small, free, single-page utilities. No sign-up, nothing tracked.
Percentage Calculator
Quick X% of Y, and X as a % of Y.
IMEI Validator
Generate the 15th check digit, or verify an existing one.
UK Take-Home Pay vs Salary
Tax code → take-home pay and effective rate across a salary range.
Loan Calculator
Monthly payment, total interest, and total repaid, with a full schedule.
What's My IP
Your public IP, network location, browser, and device — what any site sees.
Tiered Pricing Calculator
Model graduated pay-per-use pricing — total cost and effective rate across a volume range.