Bits&Bobs
Odd little tools that just work. Free, quick, and nobody asks for your email.
UK Salary Calculator
Take-home pay after income tax, National Insurance, pension and student loans, with Scottish rates, tax codes, bonuses and overtime.
Mortgage Calculator
Monthly repayments, total interest, and a full amortization breakdown for any home loan.
Mortgage Overpayment Calculator
See how much interest and how many years you save by overpaying your mortgage each month or with a lump sum.
Compound Interest Calculator
Watch savings and investments grow with compounding, regular contributions, and a year-by-year chart.
Percentage Calculator
Every percentage question in one place: X% of Y, percentage change, increases, and discounts.
Arrow Spine Calculator
See how cutting a shaft or changing point weight shifts an arrow's effective spine, with draw weight equivalents.
Free online calculators, built for the UK
Bits & Bobs is a small, growing collection of calculators for the questions that come up in real life: what your salary is worth after tax, what a mortgage costs each month and how much overpaying saves, how savings grow with compound interest, and quick percentage maths. Every tool runs in your browser, works on your phone, and gives you a link you can share with the numbers already filled in.
The money tools use current HMRC rates and standard lender formulas, and each page explains how the calculation works so you can check it yourself. They are estimates for planning, not financial advice.