Free UK tools that actually help
From your real take-home pay to your broadband speed, a subnet range or a cloud service lookup — a growing set of handy tools that all run right in your browser. Nothing you type is stored or sent anywhere.
Money & tax
Your real take-home pay, plus pensions, mortgage, savings and VAT — all current for the 2026/27 tax year.
Salary & Tax Calculator
Take-home pay after Income Tax, NI, pension and student loan — England, Scotland, Wales & NI, 2026/27.
Pension Calculator
Combine up to five pensions and project their growth over the years you choose.
Mortgage Calculator
Estimate monthly repayments and total interest for any loan amount, rate and term.
Savings & Interest
See how your savings grow with regular deposits and compound interest.
VAT Calculator
Add or remove VAT at 20%, 5% or any rate. Quick and simple.
Broadband, networking & cloud
Test your connection, plan IP ranges, and look up the equivalent service across the big cloud providers.
Broadband Speed Test
Measure your download, upload and ping on a live speedometer — no app needed.
CIDR / Subnet Calculator
Work out IPv4 and IPv6 network ranges, masks and host counts from any prefix.
Cloud Service Mapping
Find the equivalent service across AWS, Azure and Google Cloud — a searchable cheat sheet.
Guides & explainers
Plain-English guides to go with the tools — how UK tax really works, what you take home at common salaries, and how to make sense of your broadband speed.
UK tax brackets 2026/27 · Take-home on £30k–£50k · Salary sacrifice explained · What speed do I need? · Why is my broadband slow? · Mbps vs MB/s
Home Assistant blog
A seven-part build log — local control of a GivEnergy solar-and-battery system, myenergi hot water and an Octopus tariff on a Raspberry Pi 5, with the real configs.
AWS blog
Hands-on AWS proof-of-concept write-ups from a home lab — real experiments across serverless, networking and IAM, with the commands to reproduce them.
Why Toolbox UK?
Every tool here runs entirely in your own browser. That means it's fast, works offline once loaded, and none of the numbers you type — your salary, your pension, your broadband results — ever leave your device. The UK tax figures are kept up to date for the current 2026/27 tax year.