Alle Tools

Die vollständige Bibliothek

343 Rechner und browserbasierte Tools in 18 Kategorien — privat und kostenlos.

AI Tools

8 live

AI Token Counter

Count estimated tokens, characters, words, sentences, and timing for leading AI models.

AI Cost Calculator

Estimate input, output, daily, and monthly API costs from your prompt.

Context Window Calculator

See how much of each model’s context window your prompt uses.

Token Visualizer

Explore a local approximation of how text becomes model tokens.

Prompt Analyzer

Inspect prompt complexity, structure, placeholders, code, and more—privately.

AI Model Comparison

Compare context, output limits, pricing, vision, and tool support.

Prompt Size Estimator

Translate prompt length into words, tokens, pages, and reading time.

AI Pricing Calculator

Forecast monthly API budgets across major AI providers.

Gesundheit

21 live

Body Mass Index from height and weight.

Körperfett-Rechner

Estimate body fat with the U.S. Navy method.

Magermasse-Rechner

Fat-free mass from height and weight.

Fat-free mass index for athletes.

Idealgewicht-Rechner

Reference weight ranges by height.

Grundumsatz-Rechner

Basal metabolic rate at rest.

Total daily energy expenditure.

Kalorien-Rechner

Daily calorie needs by activity level.

Kaloriendefizit-Rechner

Targets for gradual weight change.

Protein-Rechner

Daily protein target in grams.

Makronährstoff-Rechner

Protein, carbs and fat targets.

Wasserbedarf-Rechner

Daily hydration target.

Pace, distance and finish time.

Herzfrequenz-Zonen-Rechner

Five training zones from max HR.

Schwangerschafts-Rechner

Weeks pregnant and trimester.

Schwangerschaftsgewicht-Rechner

Reference weight-gain range by pre-pregnancy BMI.

Geburtstermin-Rechner

Estimated due date from LMP.

Empfängnis-Rechner

Estimated conception date.

Eisprung-Rechner

Estimated fertile window.

Perioden-Rechner

Estimate your next period from cycle length.

Taille-Hüft-Verhältnis

Body-shape health indicator.

Tiere

18 live

Katzen-Tragezeit-Rechner

Estimated feline due date.

Kuh-Tragezeit-Rechner

Estimated calving date.

Hunde-Tragezeit-Rechner

Estimated canine due date.

Ziegen-Tragezeit-Rechner

Estimated kidding date.

Meerschweinchen-Tragezeit-Rechner

Estimated guinea pig due date.

Stuten-Tragezeit-Rechner

Estimated foaling date.

Lama-Tragezeit-Rechner

Estimated llama due date.

Kaninchen-Tragezeit-Rechner

Estimated rabbit due date.

Schaf-Tragezeit-Rechner

Estimated lambing date.

Schwein-Tragezeit-Rechner

Estimated farrowing date.

Rinder-pro-Hektar-Rechner

Estimate herd capacity from available forage.

Futterverwertungs-Rechner

Feed used per unit of weight gained.

Getreidesilo-Rechner

Round-bin storage capacity estimate.

Tiersterblichkeits-Rechner

Deaths as a percentage of a herd or flock.

Pferdegewicht-Rechner

Estimate adult horse body weight from measurements.

Hundegewicht-Tracker

Record and compare measured dog weights.

Katzengewicht-Tracker

Record and compare measured cat weights.

Rindergewicht-Rechner

Estimate cattle weight from body measurements.

Finanzen

16 live

Hypothekenrechner

Monthly payment and total interest.

Personal loan payment estimate.

Autokredit-Rechner

Car payment estimate.

Payment from principal, rate and term.

Tilgungsrechner

Full loan amortization schedule.

Zinseszinsrechner

Growth with compounding.

Investmentrechner

Future value of investments.

Retirement savings projection.

Sparziel-Rechner

Time to reach a savings target.

Inflationsrechner

Purchasing power over time.

Annual salary from hourly rate.

Gehalt-zu-Stunden-Rechner

Hourly rate from annual salary.

Budgetverteilungs-Rechner

Split income into needs, wants, savings.

Vermögensrechner

Assets minus liabilities.

Schuldenabbau-Rechner

Time to pay off debt.

Kreditkarten-Tilgungsrechner

Payoff time and interest.

Islamische Finanzen

9 live

Allgemeiner Zakat-Rechner

Zakat on combined assets.

Bargeld-Zakat-Rechner

Zakat on cash holdings.

Gold-Zakat-Rechner

Zakat on gold you enter by weight.

Silber-Zakat-Rechner

Zakat on silver you enter by weight.

Geschäfts-Zakat-Rechner

Zakat on business assets.

Investment-Zakat-Rechner

Zakat on investments.

Nisab threshold from gold or silver.

Fidya for missed fasts.

Islamischer Erbschaftsrechner

Organise heirs and estate for Faraid review.

Mathematik

7 live

Find percentages and changes.

Add and multiply fractions.

Wissenschaftlicher Rechner

Basic expressions in the browser.

Durchschnittsrechner

Mean of a set of numbers.

Verhältnisrechner

Split a total by ratio.

Dreiecksrechner

Area and perimeter of triangles.

Zufallszahlengenerator

Random integers or decimals.

Datum & Uhrzeit

7 live

Exact age from date of birth.

Datumsdifferenz-Rechner

Days between two dates.

Add or subtract days from a date.

Zeitdauer-Rechner

Duration between times.

Total hours from time entries.

Werktage-Rechner

Weekdays between dates.

Countdown-Rechner

Time until a target date.

Bildung

5 live

Grade point average.

Weighted course grade.

Abschlussnoten-Rechner

Score needed on the final.

Cumulative GPA across semesters.

Anwesenheitsrechner

Attendance percentage.

Umrechner

12 live

Längenumrechner

Meters, feet, miles and more.

Gewichtsumrechner

Kilograms, pounds and ounces.

Temperaturumrechner

Celsius, Fahrenheit, Kelvin.

Flächenumrechner

Square meters, acres, hectares.

Volumenumrechner

Liters, gallons, cups.

Geschwindigkeitsumrechner

mph, km/h, m/s, knots.

Energieumrechner

Joules, calories, kWh.

Seconds, minutes, hours, days.

Verbrauchsumrechner

MPG and L/100km.

Cups, tablespoons, milliliters.

Manueller Wechselkursumrechner

Convert with a rate you enter.

Datenspeicher-Umrechner

Bytes, KB, MB, GB, TB.

Haus

18 live

Volume for slabs and footings.

Estimate room cooling capacity.

Quadratmeter-Rechner

Find room or project area.

Plan risers, treads and run.

Liters or gallons needed.

Tiles needed for a floor.

Bodenbelag-Rechner

Flooring boxes needed.

Gravel volume and tonnage.

Shingle bundles needed.

Rolls needed for walls.

Mulch volume for garden beds.

Pflanzenabstands-Rechner

Plan plants from area and spacing.

Compost volume for a bed.

Product amount from a nutrient target.

Blumenerderechner

Potting-mix volume for round pots.

Hochbeet-Erdrechner

Soil mix volume for raised beds.

Gemüsesamen-Rechner

Seeds needed for rows and germination.

Gemüseertrags-Rechner

Estimate harvest from plant count.

Entwickler-Tools

29 live

Unix-Timestamp-Konverter

Unix time to readable date.

Epoch-Konverter

Epoch seconds and milliseconds.

Passwort-Generator

Secure random passwords.

Passwort-Stärke-Prüfer

Check password strength locally.

SHA-256, SHA-384, SHA-512.

Pretty-print JSON.

Validate JSON syntax.

Compress JSON to one line.

JSON-Beautifier

Beautify and indent JSON.

Decode JWT header and payload.

Generate UUID v4.

Validate UUID format.

Base64-Encoder & Decoder

Encode and decode Base64.

URL-Encoder & Decoder

Percent-encode and decode URLs.

Indent HTML markup.

Format CSS stylesheets.

Format SQL queries (never executed).

Indent XML documents.

Clean up YAML formatting.

Test JavaScript regular expressions.

Markdown-Vorschau

Preview Markdown as HTML.

Cron-Ausdrucks-Parser

Parse cron schedule fields.

Subnetz-Rechner

Hosts in a CIDR block.

MIME-Typ-Lookup

Common MIME type descriptions.

HTTP-Statuscode-Lookup

HTTP status code meanings.

HEX, RGB and HSL.

QR-Code-Generator

Make a QR code from text or a URL.

CSV ↔ JSON-Konverter

Convert tabular data locally.

Text-Diff-Checker

Compare two pieces of text.

PDF

10 live

Merge, split, sign and convert PDFs.

PDF zusammenführen

Combine PDF files into one document.

Split a PDF into individual page files.

Add a styled name or signature image to a PDF.

Convert each PDF page to a PNG image.

Turn multiple images into one PDF.

Convert RTF documents to PDF.

Convert RTF documents to Word.

Convert Word DOCX documents to PDF.

PDF-Text zu DOCX

Extract text from a PDF into a Word DOCX file.

Bild

2 live

Bildgrößen-Tool

Resize, convert and strip metadata.

Reduce image file size.

Chemie

29 live

Convert between moles, particles, and mass.

Molmassen-Rechner

Find molar mass from a chemical formula.

Molekulargewicht-Rechner

Compute molecular weight of any compound.

Gramm-zu-Mol-Rechner

Convert a mass in grams to moles.

Mol-zu-Gramm-Rechner

Convert moles to mass in grams.

Massenprozent-Rechner

Find mass percent composition of a compound.

Ausbeute-Rechner

Compare actual vs. theoretical yield.

Summenformel-Rechner

Derive the simplest whole-number ratio.

Molekularformel-Rechner

Find the true molecular formula from empirical data.

Limitierender Reaktant Rechner

Identify the limiting reagent in a reaction.

Molaritäts-Rechner

Calculate molarity from moles and volume.

Molalitäts-Rechner

Express concentration as moles per kilogram.

Normalitäts-Rechner

Find normality for acid-base and redox work.

Verdünnungs-Rechner

Use C₁V₁ = C₂V₂ to dilute stock solutions.

Lösungskonzentration Rechner

Convert between common concentration units.

Ideale Gasgesetz-Rechner

Solve PV = nRT for any variable.

Boyle-Gesetz-Rechner

Relate pressure and volume at constant temperature.

Charles-Gesetz-Rechner

Relate volume and temperature at constant pressure.

Kombiniertes Gasgesetz-Rechner

Link P, V, and T when moles are constant.

Gay-Lussac-Gesetz-Rechner

Relate pressure and temperature at constant volume.

Dalton-Gesetz-Rechner

Find partial pressures in gas mixtures.

Spezifische Wärme Rechner

Compute q = mcΔT for heating or cooling.

Wärmekapazitäts-Rechner

Find heat capacity from mass and specific heat.

Enthalpie-Rechner

Estimate ΔH from bond energies or Hess's law.

Gibbs-Energie-Rechner

Determine spontaneity with ΔG = ΔH − TΔS.

Elektronenkonfiguration-Rechner

Write full and noble-gas electron configurations.

Atommasse-Rechner

Weighted average atomic mass from isotopes.

Isotopen-Rechner

Compare isotope numbers and neutron counts.

Halbwertszeit-Rechner

Model radioactive decay over time.

Physik

35 live

Geschwindigkeits-Rechner

Find velocity from displacement and time.

Geschwindigkeits-Rechner

Find speed from distance and time.

Mittlere Geschwindigkeit Rechner

Mean speed over multiple segments.

Beschleunigungs-Rechner

Rate of change of velocity over time.

Strecke-Rechner

Distance from speed and time or SUVAT.

Time from distance and speed or acceleration.

Freier Fall Rechner

Motion under gravity near Earth's surface.

Wurfbewegung-Rechner

Range, height, and flight time for projectiles.

Compute force with F = ma.

Gewichts-Rechner

Gravitational weight from mass and g.

Linear momentum p = mv.

Impulse equals change in momentum.

Drehmoment-Rechner

Rotational force τ = rF sin θ.

Kinetische Energie Rechner

Energy of motion: KE = ½mv².

Potenzielle Energie Rechner

Gravitational PE = mgh.

Mechanical work W = Fd cos θ.

Leistungs-Rechner

Power as work or energy per time.

Mechanische Energie Rechner

Total KE + PE in conservative systems.

Wirkungsgrad-Rechner

Output vs. input energy or power.

Ohmsches Gesetz Rechner

Relate voltage, current, and resistance.

Spannungs-Rechner

Find voltage from current and resistance.

Find current from voltage and resistance.

Widerstands-Rechner

Resistance from V/I or resistivity.

Elektrische Leistung Rechner

Power in circuits: P = VI = I²R.

Kapazitäts-Rechner

Charge storage Q = CV and parallel-plate C.

Frequenz-Rechner

Frequency from period or wave speed.

Wellenlänge-Rechner

Wavelength from speed and frequency.

Wellengeschwindigkeit Rechner

Speed of propagation v = fλ.

Perioden-Rechner

Period as the inverse of frequency.

Thin-lens equation and magnification.

Spiegelgleichung Rechner

Spherical mirrors and ray diagrams.

Brechungs-Rechner

Snell's law and index of refraction.

Pressure as force per unit area.

Mass per unit volume ρ = m/V.

Auftrieb-Rechner

Archimedes' principle and floating objects.

Statistik

29 live

Mittelwert-Rechner

Arithmetic average of a data set.

Middle value of sorted data.

Most frequently occurring value.

Spannweite-Rechner

Spread from minimum to maximum.

Varianz-Rechner

Average squared deviation from the mean.

Standardabweichungs-Rechner

Typical distance from the mean.

Quartil-Rechner

Q1, Q2, and Q3 for any data set.

Interquartilsabstand-Rechner

IQR = Q3 − Q1 robust spread measure.

Wahrscheinlichkeits-Rechner

Basic probability rules and complements.

Binomial-Rechner

Binomial probabilities and cumulative counts.

Normalverteilungs-Rechner

Z-scores and normal CDF probabilities.

Poisson-Rechner

Rare events in fixed intervals.

Kombinations-Rechner

n choose k unordered selections.

Permutations-Rechner

Ordered arrangements of k from n.

Korrelations-Rechner

Pearson r between two variables.

Lineare-Regression-Rechner

Best-fit line slope and intercept.

Coefficient of determination R².

Z-Score-Rechner

Standardize values to the z scale.

One-sample z-test for known σ.

One- and two-sample t-tests.

Chi-Quadrat-Rechner

Goodness-of-fit and independence tests.

One-way analysis of variance F-test.

Stichprobengrößen-Rechner

Plan n for a target margin of error.

Fehlertoleranz-Rechner

MOE from sample size and confidence.

Konfidenzintervall-Rechner

CI for a mean or proportion.

Perzentil-Rechner

Find the kth percentile of data.

Prozent-Rang-Rechner

Percentile rank of a given value.

Relatives-Risiko-Rechner

Risk ratio for cohort studies.

Zufallsstichproben-Rechner

Draw a simple random sample.

Erde & Wetter

20 live

Antipode-Rechner

Find the point on Earth directly opposite any location.

Lat-Lon-Abstand-Rechner

Great-circle distance between two coordinate pairs.

Initial bearing between two coordinates.

Großkreisdistanz-Rechner

Shortest path distance over a sphere.

Sonnenauf- und -untergang-Rechner

Approximate sun times for a location and day.

Mondphase-Rechner

Moon phase and illumination for a date.

Windchill-Rechner

Feels-like temperature with wind (US formula).

Hitzeindex-Rechner

Apparent temperature from heat and humidity.

Taupunkt-Rechner

Dew point from temperature and humidity.

Luftfeuchtigkeit-Rechner

Relative humidity from temp and dew point.

Niederschlag-Rechner

Rain volume from area and depth.

Regen zu Schnee-Rechner

Convert liquid rain to snow depth.

Schneefall-Rechner

Snow depth from liquid equivalent.

UV-Index-Rechner

Estimated UV index from sun angle.

Sonnenbrandzeit-Rechner

Minutes to burn by skin type and UV.

Sonnenexposition-Rechner

UV dose from UV index and duration.

Wachstumsgradtage-Rechner

Heat accumulation for crops.

Frostdatum-Rechner

Estimate first frost day of year.

Luftdichte-Rechner

Density from temperature and pressure.

Luftdruck-Rechner

Pressure at altitude above sea level.

Essen

68 live

Convert butter between cups, grams, and sticks.

Butterstücke-Umrechner

Convert butter sticks to grams or cups.

Kuchenformen-Umrechner

Scale a recipe between pan sizes.

Kochmaße-Umrechner

Convert cups, tablespoons, and teaspoons.

Tassen zu Pfund-Umrechner

Convert cups of an ingredient to pounds.

Pfund zu Tassen-Umrechner

Convert pounds of an ingredient to cups.

Tassen zu Gramm-Umrechner

Convert cups to grams for baking.

Gramm zu Tassen-Umrechner

Convert grams to cups for baking.

Gramm zu Esslöffel-Umrechner

Convert grams to tablespoons.

Gramm zu Teelöffel-Umrechner

Convert grams to teaspoons.

ml zu Gramm-Rechner

Convert milliliters to grams by density.

Öl zu Butter-Umrechner

Substitute oil for butter in recipes.

Reisumrechnung-Umrechner

Convert raw rice to cooked volume.

Nudelumrechnung-Umrechner

Convert dry pasta to cooked weight.

Kräuterumrechnung-Umrechner

Convert fresh herbs to dried.

Knoblauchumrechnung-Umrechner

Convert garlic cloves to teaspoons.

Convert between yeast types.

Ground coffee for multiple servings.

Kaffee-Verhältnis-Rechner

Coffee-to-water brew ratio.

Kaffee zu Wasser-Rechner

Find water for a coffee dose.

Cold Brew-Rechner

Coffee and water for cold brew.

Teeaufguss-Rechner

Tea leaves for water volume.

Koffein-Rechner

Estimate caffeine from coffee dose.

Kaffee-Fußabdruck-Rechner

Estimate environmental impact of coffee.

Alkoholgehalt-Rechner

Calculate ABV from gravities or proof.

Alkoholverdünnung-Rechner

Dilute spirits to a target ABV.

kalte Getränke-Rechner

Estimate dilution from melting ice.

Cocktail-Verhältnis-Rechner

Split a cocktail into ingredient parts.

Wein-SO2-Rechner

Potassium metabisulfite addition for wine.

Speisezucker-Rechner

Homebrew bottle carbonation sugar.

Bäckerprozent-Rechner

Express ingredients as % of flour.

Kuchenpreis-Rechner

Price a custom cake order.

Kuchenportionen-Rechner

Servings from cake dimensions.

Pfannkuchenrezept-Rechner

Scale pancake batter ingredients.

Eiscreme-Rechner

Base mix for homemade ice cream.

Donuts from batch dough weight.

Schokolade-Rechner

Chocolate needed for a recipe.

Selbstaufgehendes Mehl-Rechner

Make self-rising flour at home.

Sauerteig-Rechner

Hydration and starter feeding.

Pizza dough ingredient amounts.

Pizza-Party-Rechner

Pizzas needed for a crowd.

Pizzagröße-Rechner

Area of a pizza by diameter.

Pizza-Vergleich-Rechner

Compare two pizza sizes.

Grillgröße-Rechner

Grill cooking surface area.

Grillparty-Rechner

Meat needed for a BBQ.

Partygetränke-Rechner

Drinks needed for an event.

Popcorn-Rechner

Kernels for desired popcorn volume.

Taco-Bar-Rechner

Plan a taco bar for a crowd.

Hochzeitsalkohol-Rechner

Bottles needed for a wedding.

Schinken pro Person-Rechner

Ham weight for a gathering.

Reis zu Wasser-Rechner

Water for a rice volume.

Eierkochen-Rechner

Boiling time for eggs.

ideale Eierkochzeit-Rechner

Adjust egg time for altitude.

Steak-Garzeit-Rechner

Pan or grill time by thickness.

Truthahn-Garzeit-Rechner

Roasting time by turkey weight.

Truthahn auftauen-Rechner

Safe thaw time for turkey.

Truthahngröße-Rechner

Turkey weight for guest count.

Wasserkühlung-Rechner

Mix hot and cold water.

Salatkalorien-Rechner

Estimate salad calorie total.

Kartoffelbrei pro Person-Rechner

Potatoes for a crowd.

Salt brine for wet curing.

Bacon-Pökeln-Rechner

Dry cure salt and sugar for bacon.

Brotaufstrich-Rechner

Butter or spread for servings.

Schwefel-Rechner

SO₂-Zusätze für die Weinbereitung.

Lebensmittellagerung-Rechner

Estimated safe storage duration.

Rezeptskalierung-Rechner

Scale any ingredient amount.

Zutatenaustausch-Rechner

Convert substitute amounts.

Meal Prep-Rechner

Portions and batches for meal prep.