About us

We build free calculators for the questions that pop up in real life: how much paint for the spare room, how much food for a growing puppy, what your paycheck actually looks like after deductions.

Why we made this

Most calculators online feel like a tax form. Ours are quick, colourful and written in plain English — with a friendly calculator called Bolt cheering you on.

How we work

• Every calculator shows its math, so you can check our thinking.
• We update our numbers when the guidance behind them changes.
• Results are estimates to help you plan — never a substitute for professional advice.

Got an idea for a calculator? We'd love to hear it on our contact page.