Eighteen calculators covering finance (loan, mortgage, interest, savings, VAT, tip, discount), business (ROI, break-even, profit margin, salary tax), health (BMI, calorie), lifestyle (age, fuel cost, GPA) and general utility (percentage, unit converter). Each one runs instantly in your browser as you type — no submit button, no waiting, no ads in the calculation flow. This guide explains which calculator solves which real-world question, and how to combine them for planning decisions.
Bereken BTW-bedragen en prijzen (21%, 9%, 0%).
Bereken percentages snel en gemakkelijk.
Bereken kortingsprijzen en besparingen.
Bereken maandlasten en rente van een lening.
Gebruik Rente Calculator direct online.
Bereken exacte leeftijd op basis van geboortedatum.
Bereken je Body Mass Index.
Schat je nettoloon na belasting.
Bereken maandelijkse hypotheeklasten.
Bereken fooien en splits rekeningen.
Gebruik Break-even Calculator direct online.
Gebruik Winstmarge Calculator direct online.
Gebruik ROI Calculator direct online.
Gebruik GPA Calculator direct online.
Gebruik Calorie Calculator direct online.
Gebruik Eenheden Omrekenen direct online.
Bereken brandstofkosten voor een rit.
Bereken de groei van je spaargeld.
Buying a home: start with the Mortgage Calculator for the monthly payment, then use the Loan Calculator to compare a smaller loan for the down payment, and the Savings Calculator to plan how quickly you can rebuild savings. Evaluating an investment: ROI Calculator for expected return, Interest Calculator for compound growth over time, Savings Calculator to model steady contributions. Running a business? Break-Even Calculator tells you the units to sell, Profit Margin Calculator sets the price, VAT Calculator adds tax correctly for the region.
BMI Calculator gives a rough weight-for-height signal but ignores muscle mass and body composition — treat it as one data point, not a verdict. Calorie Calculator uses the Mifflin-St Jeor equation, one of the most accurate formulas for basal metabolic rate; multiply by an activity factor for daily needs. Age Calculator returns exact years, months and days, useful for legal, medical or milestone contexts.
Percentage Calculator handles the three common variants: 'what is X% of Y', 'what percent is X of Y', and 'percent change from X to Y'. Discount Calculator answers 'what's the final price after this deal'. Tip Calculator splits a bill including or excluding the tip, useful for group dinners. Unit Converter covers length, weight, temperature, volume and area — no more googling 'how many ounces in a cup'.
The maths is exact — floating-point precision is not a limitation at everyday scales. What varies is the model behind the calculation: tax rates change by country and year, mortgage amortisation assumes fixed rates, BMI ignores body composition. Every calculator uses standard, published formulas, but you should still cross-check any high-stakes decision (loan approval, tax filing) with a professional or an official calculator from your local authority.
There's no submit button — every field is reactive. This lets you explore scenarios quickly: nudge the interest rate up 0.5% to see the monthly payment impact, change the term from 30 to 25 years, drop the tip from 20% to 15%. This 'live modelling' approach makes the calculators genuinely more useful than a static formula.
The maths is exact. Any variance comes from the underlying model — for example, mortgage calculators assume a fixed rate and don't include insurance or property tax. Use the results as an accurate starting point, not a final answer for legal or tax decisions.
No. All calculations run in your browser. Nothing is saved, uploaded, or logged.
No. Every calculator is free and unlimited without a signup.
Once the page has loaded, yes — the calculation runs entirely in your browser, so you can disconnect and it still works.
Yes. All calculators are fully responsive and are actually used more on mobile than desktop for quick everyday calculations.