About OmniCalc

Our Mission

OmniCalc exists because most calculator sites hand you a number and nothing else. Here, each tool shows the formula it runs, a worked example you can follow with a pen, and notes on the edge cases — so the answer is something you can verify, not something you have to trust.

Each calculator is tested against hand-worked cases before it ships, and tools that depend on statutory figures — tax caps, benefit rates, poverty thresholds — name the year their defaults come from and let you edit the rate fields, so a tool built in one tax year stays honest in the next.