What your everyday life actually costs.
Free calculators for cars, housing, energy and travel. Every formula is shown, every assumption is named, and nothing asks you to sign up.
Car cost per kilometre
Most usedFuel, servicing and insurance are not included — the full car cost calculator adds those.
Calculate full car costsMost often calculated
Four calculators instead of twenty-three. The rest is below, sorted rather than stacked.
Car Wear per Kilometer Calculator
Estimate your car depreciation cost per kilometer using purchase value, current value, and mileage.
Cars & mobility · 2 minHome Utility Cost Calculator
Calculate your monthly utility bills including electricity, gas, water, and internet.
Housing & energy · 2 minGas vs Heat Pump Heating Cost Calculator
Compare annual heating costs for gas boiler and heat pump with your own prices, efficiency, and maintenance assumptions.
Housing & energy · 3 minSolar Battery Payback Calculator
Estimate solar battery payback from your own battery cost, cycle count, efficiency, and electricity vs feed-in prices.
Housing & energy · 3 minWhy you can trust these numbers
The part most calculator sites leave out — and exactly what Google and AI assistants look for before citing a page.
The formula is shown
Every calculator prints the equation it uses in plain text. No result without a visible path to it.
Example: value lost per km = (purchase price − current value) ÷ kilometres drivenAssumptions are named
Default values are listed one by one, with their unit and where they come from. Anything we cannot source is labelled an estimate.
Every default is editable — nothing is hidden in the codeThe date is visible
Each calculator page says when its stored values were last reviewed, right under the heading.
Shown as "Last updated" on every calculatorLimits are stated
What a calculator cannot account for is written down next to what it can. That is worth more than a number without context.
e.g. no regional grid fees, no tax effectsAll calculators
Sorted by topic. The time shown is roughly how long the form takes to fill in.
Stored values last reviewed: August 2026