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All 20 sections, every tool organised by topic.

πŸ’±
382 tools
Currency Insights
Explore currency calculation methods and practical examples...
πŸ’°
133 tools
Finance
Salary and tax, loan and mortgage repayments, savings growth...
❀️
46 tools
Health
BMI, BMR and kidney function; cycle, due-date and conception...
πŸ”’
42 tools
Math
Percentage change versus percentage points, mean versus medi...
πŸ”§
32 tools
Sport
Heart rate zones, VO2 max and calorie burn by activity, pace...
πŸ”¬
30 tools
Science
Molarity, dilution and pH for chemistry; force, energy and m...
πŸ”₯
26 tools
FIRE
Work out your FIRE number, your safe withdrawal rate and how...
πŸ“Š
23 tools
Business
Liquidity, leverage, margin, cash-cycle and unit-economics c...
πŸ’Ό
19 tools
Work
Hourly rate, overtime and total compensation, plus statutory...
πŸ“ˆ
18 tools
Statistics
Standard deviation, correlation and confidence intervals for...
πŸ“…
15 tools
Dates
Add days, weeks or months to a date, find the exact gap betw...
🍽️
13 tools
Food
Convert keg and bottle volumes into servings, butter between...
πŸ”§
12 tools
Developer
Browser-side tools for formatting and inspecting the data de...
πŸ”§
9 tools
Weather
Convert temperatures and work out wind chill, heat index, de...
✈️
7 tools
Travel
Work out fuel cost and consumption for a trip, journey time...
πŸ”„
6 tools
Converters
Convert kVA to amps, kW to amps for single- and three-phase...
🏠
3 tools
Home
How big a heating or cooling system a room needs, how to mea...
πŸŽ“
2 tools
Education
Convert grades into a GPA on the standard 4.0 scale, or work...
🧾
2 tools
Tax
Income tax and VAT/GST calculators with a country selector c...
πŸ‘—
1 tools
Fashion
Convert waist and inseam measurements into an actual jeans s...

Articles

All articles
A hand holding a smartphone at a wooden table, showing a personal investing app with a balance and rising line chart

The Β£20,000 ISA allowance for 2025/26, and what changes after it

The headline number has not moved in years, but two things around it have: a UK-shares top-up was proposed and then drop...

Tax forms, a pen, and a coffee mug arranged on a dark wooden desk

The personal allowance freeze, and what fiscal drag actually costs you

Nobody raised your tax rate. Nobody needed to. Freezing the personal allowance and the higher rate threshold while wages...

An older man and woman sitting close together indoors, reviewing a paper document

The state pension for 2026/27, and how the triple lock set it

Earnings growth beat inflation this year, so the triple lock used the earnings figure. That single comparison, repeated...

A large white percentage sign standing on a wooden roof

What a rate change does to your mortgage payment

Central banks move rates in quarter points, and lenders pass them on in steps that look small on paper. Here is what eac...

A person at a desk holding a model house next to a calculator and paperwork

How much can I borrow, and what does a lender actually count?

The number a lender will give you is not your salary times four. It is a payment they think you can still afford if rate...

A small wooden model house beside a magnifying glass on a table

Fixed or variable: how to choose the way your rate is set

The choice is not a forecast about rates. It is a question about how much a known payment is worth to your household, an...

A brick building with a yellow door and window

The Lifetime ISA 25% penalty, and why it costs more than just the bonus

A Lifetime ISA pays a generous 25% government bonus, up to Β£1,000 a year. Take the money out for the wrong reason, thoug...

A street corner with a storefront on the corner

UK business rates in 2026/27: five multipliers, one revaluation, and a relief scheme that just changed shape

A 2026 revaluation, a permanent split into five multipliers, and the end of the old retail relief scheme have all landed...

An elderly couple reviewing documents at home

Pension Credit in 2025/26: the weekly minimum it guarantees, and why even a small award matters

Pension Credit tops up a low income in retirement to a guaranteed weekly floor β€” and getting even a few pence of it open...

A person using a white smartphone

UK student loan repayment thresholds in 2026/27, plan by plan

Five different student loan plans run in parallel in the UK, each with its own threshold, repayment rate, and interest f...

A woman sitting at a desk using a laptop computer

UK Corporation Tax rates in 2026: 19%, 25%, and the 26.5% marginal band

The 2026 Corporation Tax rates are unchanged from the last three years, but the marginal relief band between them is whe...

A pile of coins sitting on top of a pile of money

UK National Insurance thresholds for 2026/27: where it starts and what you pay

Nothing has moved on employee National Insurance for 2026/27 β€” the thresholds and rates are exactly where they were the...