laskeprosentti

Topic

Everyday and leisure

Percentages don't live only in an invoice and on a payslip. They're also a drink's strength, a fuel price rise and the number next to a set in your training programme. In these calculations the units matter more than anywhere else.

This topic's calculators

drink strengthPunch calculatorA drink's alcohol strength, total volume and servings per guest.fuel priceFuel price calculatorA fuel price rise in per cent and in pounds for a journey.training weightTraining weight calculatorPercentages of your max and a 1RM estimate from your reps.percentage calculatorPercentage calculatorFive modes: percentage of a number, share, reverse calculation, increase and change.discount calculatorDiscount calculatorDiscounted price, saving, discount percentage and successive discounts.

Background on this topic

The units decide

You can't work out the alcohol strength of a mix by averaging the ingredients' percentages – each strength has to be weighted by its volume. In fuel calculations, in turn, consumption is given per 100 km (or as miles per gallon), so the journey has to be converted first. In both, the wrong unit gives a result that looks sensible but is badly off.

What these calculators don't tell you

The punch calculator tells you a drink's strength, not your blood alcohol level or whether you're fit to drive. The training weight calculator tells you the kilos, not whether a programme suits you. In both, safety is a separate question.

Other topics

All the site's calculators are grouped into six topics. The same calculator can belong to more than one, because a percentage calculation is rarely tied to just one situation.

Discounts and prices6Tax and VAT5Salary and work4Loans and interest5Maths and formulas5

Guides

Frequently asked questions about everyday and leisure

How do I work out the strength of a mixed drink?

Weight each strength by its volume: Σ(amount × strength) / total amount. Don't just average the percentages.

Does the punch calculator tell me my blood alcohol level?

No. It works out the drink's strength, not your blood alcohol level. Blood alcohol depends on many personal variables.

How do I work out the fuel cost of a journey?

Convert the journey to litres first: consumption / 100 × km, then multiply by the price per litre.

What do the percentages in a training programme mean?

They're shares of your one-rep max. 75% of a 120 kg max is 90 kg. The percentages come from the training weight calculator.