Embed our calculators on your website for free
You can add 48 Rechenportal calculators to your own website for free – as a compact version with inputs and result, without the long explanations.
- FreeNo sign-up, no fees.
- No cookies, no trackingNo cookie banner needed, no data passed to third parties.
- CompactTwo views: inputs and result. The height adjusts automatically.
- Always up to dateWe maintain rates and values – nothing to update on your side.
How it works
- Pick a calculator below and open “Show code”.
- Copy the code.
- Paste it where the calculator should appear – in WordPress, for example, with the “Custom HTML” block.
The only condition: the source link “Rechenportal” below the calculator stays visible and unchanged. Details in the terms of use.
Taxes, Salary & Finance
Gross-to-Net Salary CalculatorFrom gross to net in secondsShow code
<script src="https://rechenportal.de/widget.js" data-calc="salary-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/salary-calculator/">Rechenportal</a></p>
Inflation CalculatorCalculate purchasing power loss and price trendsShow code
<script src="https://rechenportal.de/widget.js" data-calc="inflation-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/inflation-calculator/">Rechenportal</a></p>
Severance Pay CalculatorCalculate severance pay: fifth-part rule, tax burden, optimization tipsShow code
<script src="https://rechenportal.de/widget.js" data-calc="severance-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/severance-calculator/">Rechenportal</a></p>
Midijob CalculatorCalculate Midijob net pay: transition zone, social insurance savings, pensionShow code
<script src="https://rechenportal.de/widget.js" data-calc="midijob-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/midijob-calculator/">Rechenportal</a></p>
Active Pension CalculatorCalculate the 2026 Active Pension: up to €2,000 wage tax-free, net comparison, tax savingsShow code
<script src="https://rechenportal.de/widget.js" data-calc="active-pension-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/active-pension-calculator/">Rechenportal</a></p>
Commuter Allowance Calculator2026 commuter allowance: 38 cents from the first kilometre — deductions & real tax savingShow code
<script src="https://rechenportal.de/widget.js" data-calc="commuter-allowance-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/commuter-allowance-calculator/">Rechenportal</a></p>
Overtime CalculatorCalculate overtime surcharge and net payout — current vs. planned law comparedShow code
<script src="https://rechenportal.de/widget.js" data-calc="overtime-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/overtime-calculator/">Rechenportal</a></p>
Compound Interest CalculatorCalculate compound interest: lump sum, savings rate, interest gain & compounding effectShow code
<script src="https://rechenportal.de/widget.js" data-calc="compound-interest-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/compound-interest-calculator/">Rechenportal</a></p>
VAT CalculatorCalculate German VAT: gross to net and net to gross at 19% or 7%Show code
<script src="https://rechenportal.de/widget.js" data-calc="vat-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/vat-calculator/">Rechenportal</a></p>
Pension CalculatorCalculate your German state pension: pension points, deductions and net pensionShow code
<script src="https://rechenportal.de/widget.js" data-calc="pension-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/pension-calculator/">Rechenportal</a></p>
Income Tax CalculatorCalculate 2026 German income tax: single and joint tariff, solidarity and church taxShow code
<script src="https://rechenportal.de/widget.js" data-calc="income-tax-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/income-tax-calculator/">Rechenportal</a></p>
Hourly Wage CalculatorConvert monthly salary to hourly wage and back, including a minimum wage checkShow code
<script src="https://rechenportal.de/widget.js" data-calc="hourly-wage-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/hourly-wage-calculator/">Rechenportal</a></p>
Holiday Entitlement CalculatorCalculate holiday days: statutory entitlement, part-time and pro-rata leave on joining or leavingShow code
<script src="https://rechenportal.de/widget.js" data-calc="holiday-entitlement-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/holiday-entitlement-calculator/">Rechenportal</a></p>
Interest CalculatorSimple & daily interest: solve for interest, principal, rate or time — with formula, worked solution and German default interestShow code
<script src="https://rechenportal.de/widget.js" data-calc="interest-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/interest-calculator/">Rechenportal</a></p>
Retirement Savings Account CalculatorGermany's retirement savings account from 2027: basic & child subsidy, tax benefit and value at retirement – vs. ETF planShow code
<script src="https://rechenportal.de/widget.js" data-calc="retirement-savings-account-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/retirement-savings-account-calculator/">Rechenportal</a></p>
Cash Discount CalculatorCalculate a cash discount: discount, amount payable, VAT correction (§ 17 UStG) and effective annual rate compared with your overdraft rateShow code
<script src="https://rechenportal.de/widget.js" data-calc="cash-discount-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/cash-discount-calculator/">Rechenportal</a></p>
Currency ConverterConvert euros to dollars, Swiss francs, pounds, złoty & 25 more currencies: daily ECB reference rates, cross rates, a 90-day chart and a markup checkShow code
<script src="https://rechenportal.de/widget.js" data-calc="currency-converter" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/currency-converter/">Rechenportal</a></p>
Christmas Bonus CalculatorCalculate your net Christmas bonus – tax as a non-recurring payment, social contributions up to the 2026 ceiling, tax class comparisonShow code
<script src="https://rechenportal.de/widget.js" data-calc="christmas-bonus-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/christmas-bonus-calculator/">Rechenportal</a></p>
Family & Social
Due Date CalculatorCalculate your due date with the Naegele rule — incl. pregnancy week, trimester & maternity leaveShow code
<script src="https://rechenportal.de/widget.js" data-calc="due-date-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/due-date-calculator/">Rechenportal</a></p>
Ovulation CalculatorCalculate fertile days, ovulation & next period — not a contraception methodShow code
<script src="https://rechenportal.de/widget.js" data-calc="ovulation-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/ovulation-calculator/">Rechenportal</a></p>
Vocational Training Allowance CalculatorCalculate Germany's vocational training allowance (BAB): need, training pay and parental income under SGB IIIShow code
<script src="https://rechenportal.de/widget.js" data-calc="vocational-training-allowance-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/vocational-training-allowance-calculator/">Rechenportal</a></p>
Cars & Transport
Vehicle Tax CalculatorCalculate vehicle tax and compare carsShow code
<script src="https://rechenportal.de/widget.js" data-calc="kfz-tax-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/kfz-tax-calculator/">Rechenportal</a></p>
Fuel Cost CalculatorCalculate fuel cost per trip, per 100 km and per year for petrol, diesel, EV, hybrid, CNG and LPGShow code
<script src="https://rechenportal.de/widget.js" data-calc="fuel-cost-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/fuel-cost-calculator/">Rechenportal</a></p>
Traffic Fine CalculatorCalculate fine, points & driving ban — speeding, distance, red light & phone under Germany's 2026 fine catalogueShow code
<script src="https://rechenportal.de/widget.js" data-calc="traffic-fine-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/traffic-fine-calculator/">Rechenportal</a></p>
Tire Size & Wheel CalculatorCompare tire sizes: diameter, circumference & speedometer error old vs. new — plus wheel offset, track width, load/speed index and DOT ageShow code
<script src="https://rechenportal.de/widget.js" data-calc="tire-size-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/tire-size-calculator/">Rechenportal</a></p>
kW to HP CalculatorConvert kW to PS and hp and back – exact formula (1 PS = 0.73549875 kW), table 1–500 kW, registration field P.2 and licence limits A1/A2Show code
<script src="https://rechenportal.de/widget.js" data-calc="kw-to-hp-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/kw-to-hp-calculator/">Rechenportal</a></p>
Building & DIY
3-4-5 Method CalculatorCheck right angles using the Pythagorean theoremShow code
<script src="https://rechenportal.de/widget.js" data-calc="345-methode" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/345-methode/">Rechenportal</a></p>
Slope CalculatorCalculate slope with DIN standard complianceShow code
<script src="https://rechenportal.de/widget.js" data-calc="slope-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/slope-calculator/">Rechenportal</a></p>
Mixing Ratio CalculatorConcrete, mortar, epoxy & more — exact mixing ratiosShow code
<script src="https://rechenportal.de/widget.js" data-calc="mixing-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/mixing-calculator/">Rechenportal</a></p>
Dew Point CalculatorCalculate dew point & absolute humidity, check the mould risk on exterior walls (80% criterion) and compare indoor vs. outdoor air for ventilationShow code
<script src="https://rechenportal.de/widget.js" data-calc="dew-point-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/dew-point-calculator/">Rechenportal</a></p>
Health & Nutrition
BMI CalculatorCalculate and interpret your Body Mass IndexShow code
<script src="https://rechenportal.de/widget.js" data-calc="bmi-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/bmi-calculator/">Rechenportal</a></p>
Water Intake CalculatorCalculate your personal daily water intakeShow code
<script src="https://rechenportal.de/widget.js" data-calc="water-intake-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/water-intake-calculator/">Rechenportal</a></p>
Sleep Cycle CalculatorCalculate optimal bedtime: sleep cycles, hypnogram, sleep qualityShow code
<script src="https://rechenportal.de/widget.js" data-calc="sleep-cycle-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/sleep-cycle-calculator/">Rechenportal</a></p>
Blood Alcohol CalculatorEstimate blood alcohol (BAC) with the Widmark formula — no statement on fitness to driveShow code
<script src="https://rechenportal.de/widget.js" data-calc="blood-alcohol-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/blood-alcohol-calculator/">Rechenportal</a></p>
Ideal Weight & Body Fat CalculatorCalculate ideal weight and body fat: Broca, Devine, BMI range & US Navy formulaShow code
<script src="https://rechenportal.de/widget.js" data-calc="ideal-weight-body-fat-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/ideal-weight-body-fat-calculator/">Rechenportal</a></p>
Pace CalculatorCalculate running pace, time & distance: min/km ↔ km/h, split table and finish-time prediction from 5K to marathonShow code
<script src="https://rechenportal.de/widget.js" data-calc="pace-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/pace-calculator/">Rechenportal</a></p>
Child BMI CalculatorCalculate BMI percentiles for children & teens (0–18) using the German Kromeyer-Hauschild reference — with SDS, classification and percentile chartShow code
<script src="https://rechenportal.de/widget.js" data-calc="child-bmi-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/child-bmi-calculator/">Rechenportal</a></p>
Date & Time
Age CalculatorCalculate your exact age: years, months, days, days lived & countdownShow code
<script src="https://rechenportal.de/widget.js" data-calc="age-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/age-calculator/">Rechenportal</a></p>
Calendar Week CalculatorCurrent week number, convert dates to ISO weeks, all weeks of the year with German public holidaysShow code
<script src="https://rechenportal.de/widget.js" data-calc="calendar-week" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/calendar-week/">Rechenportal</a></p>
Days CalculatorCount the days between two dates, with working days by German state, date plus/minus days and countdownShow code
<script src="https://rechenportal.de/widget.js" data-calc="days-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/days-calculator/">Rechenportal</a></p>
Bridge Days CalculatorFind the best bridge days in Germany for 2026, 2027 and 2028: optimal leave combinations, all public holidays by state with dates, also for part-time and a four-day weekShow code
<script src="https://rechenportal.de/widget.js" data-calc="bridge-days-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/bridge-days-calculator/">Rechenportal</a></p>
Math & Calculators
Area CalculatorCalculate area and perimeter: rectangle, circle, triangle, trapezoid – or draw irregular shapes yourselfShow code
<script src="https://rechenportal.de/widget.js" data-calc="area-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/area-calculator/">Rechenportal</a></p>
Percentage CalculatorCalculate percentages: base value, percentage, change, markup & discountShow code
<script src="https://rechenportal.de/widget.js" data-calc="percentage-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/percentage-calculator/">Rechenportal</a></p>
Fraction CalculatorAdd, subtract, multiply, divide, simplify and convert fractionsShow code
<script src="https://rechenportal.de/widget.js" data-calc="fraction-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/fraction-calculator/">Rechenportal</a></p>
Rule of Three CalculatorProportional, inverse and compound rule of three with step-by-step solutionShow code
<script src="https://rechenportal.de/widget.js" data-calc="rule-of-three-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/rule-of-three-calculator/">Rechenportal</a></p>
Roman Numerals ConverterConvert Roman numerals — live in both directions, with breakdown, validation and a 1–100 chartShow code
<script src="https://rechenportal.de/widget.js" data-calc="roman-numerals-converter" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/roman-numerals-converter/">Rechenportal</a></p>
Volume CalculatorCalculate volume & surface area of cube, cuboid, cylinder, sphere, cone & pyramid in litres — plus circle and Pythagoras calculator with sketch and step-by-step solutionShow code
<script src="https://rechenportal.de/widget.js" data-calc="volume-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/volume-calculator/">Rechenportal</a></p>
Circle CalculatorCalculate a circle: all values from radius, diameter, circumference or area – plus annulus, sector and segment with diagram and step-by-step solutionShow code
<script src="https://rechenportal.de/widget.js" data-calc="circle-calculator" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Calculator by <a href="https://rechenportal.de/en/circle-calculator/">Rechenportal</a></p>
Embed a countdown
A countdown to your date – for events, openings, deadlines or holidays. It counts live and picks the unit itself: weeks and days when the date is far away, then days, hours, minutes and seconds.
<script src="https://rechenportal.de/widget.js" data-calc="days-calculator" data-mode="countdown" data-ziel="2026-12-24" data-titel="Christmas" data-lang="en" async></script> <p class="rp-credit" style="margin:4px 0 0;font-size:12px;text-align:right">Countdown by <a href="https://rechenportal.de/en/days-calculator/">Rechenportal</a></p>