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Health & Fitness
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Measures, time, recipe cost.
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Data & Computing
IP/CIDR, notation, data rate.
Trackers & Timers
Pomodoro, brainstorm, expenses.
Random Number Generators
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Mortgage Calculator
Plan home loan payments.
Loan Amortization
Full payment schedule.
Credit Card Debt
Payoff timeline & interest.
Investment Return
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Unit Converters
All converters in one hub.
Travel Cost & CO₂
Car vs EV/train/bus/flight.
RNG Hub
Random picks & number formats.
BMI Calculator
Adult BMI & ranges.
New & Recently Updated
Air Conditioner BTU
Room cooling size.
Drywall Sheet Estimator
Sheets + tape/mud.
House Cleaning Time
Estimate by tasks.
Flight CO₂
Per-flight footprint.
Daily Expense Tracker
Fast logging.
Brainstorm Timer
Timed ideas.
Calculators
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- Percentage Calculator
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- Loan Amortization Calculator
- Lease vs. Buy Calculator
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- Home Renovation Cost Calculator
- Credit Card Debt Calculator
- Student Loan Repayment Calculator
- German Income Tax Calculator
- Investment Return Calculator
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- Retirement Savings Calculator
- Compound Interest Calculator
- Body Fat Percentage Calculator
- Work Hours & Overtime Pay Calculator
- Age Calculator
- Net Present Value (NPV) Calculator
- Internal Rate of Return (IRR) Calculator
- Loan-to-Value (LTV) Ratio Calculator
- Break-Even Point Calculator
- Effective Annual Rate (EAR) Calculator
- Savings Withdrawal Calculator
- Ideal Sleep Duration Calculator
- Paint Coverage Estimator
- Daily Water Usage Calculator
- Stairs Calculator
- Split Bill Calculator
- Inflation Calculator
- Tile Calculator
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- Roof Shingle Estimator
- Time Card Calculator
- Home Affordability Calculator
- Air Conditioner BTU Calculator
- Interest-Only Loan Calculator
- Concrete Volume Calculator
- Calorie Deficit Calculator
- Drywall Sheet Estimator
- Basal Metabolic Rate (BMR) Calculator
- BMI Calculator for Children & Teens
- Weight-for-Length Calculator (0–24 Months)
- Ideal Weight & WHR Calculator
- Tip & Tax Calculator
- Molarity Calculator
- Blood Alcohol Concentration (BAC) Calculator
- VAT Calculator & Invoice Generator (Multi-Country)
- Marketplace Fee Calculator (eBay, Etsy, Amazon)
- Travel Cost, CO₂ & Time Calculator – Car vs EV, Train, Bus, Flight
- IP, Subnet & CIDR Calculator
- Day & Week Number
- Flight CO₂ Calculator
- Car vs Train Cost & CO₂ Calculator
- EV Trip Cost Calculator
- Army Fitness Test (AFT) & ACFT Calculator
Converters
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- Simple Unit Converter
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- Speed Unit Converter
- Flow-Rate Unit Converter
- Acceleration Unit Converter
- Force Unit Converter
- Pressure Unit Converter
- Torque Unit Converter
- Energy Unit Converter
- Power Unit Converter
- Viscosity Unit Converter
- Electric Unit Converter
- Temperature Unit Converter
- Data Storage Unit Converter
- Data Transfer Rate Unit Converter
- Luminous Unit Converter
- Radiation Unit Converter
- Scientific Notation Converter
- Time Zone Converter
- Cooking Measurement Converter
- Cooking Time Converter
- Simple Currency Converter
- Epoch and Unix Time Converter
Trackers
Random & Math Tools
Educational probability tools and randomizers.
- Random Number Generator
- Custom 6-from-N Generator (Generic)
- US PB-format Generator
- US MM-format Generator
- EuroJackpot-format Generator
- EuroMillions-format Generator
- DE 6aus49-format Generator
- IT SuperEnalotto-format Generator
- CA 6/49-format Generator
- CA LottoMax-format Generator
- UK 6-from-59-format Generator
- AU 6-from-45-format Generator
- AU PB-format Generator
- BR Mega-Sena-format Generator
- ZA 6-from-52-format Generator
- ZA PB-format Generator
- ES Christmas Draw-format Generator
- ES Primitiva-format Generator
- NZ Lotto-format Generator
- JP Lotto 6-format Generator
- Zodiac Number Explorer
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Homepage FAQ
What is SwissKnifeCalculator?
SwissKnifeCalculator is a free collection of calculators, converters, trackers and educational randomizers for everyday tasks in finance, health, home/DIY, cooking, energy and more.
Are your tools free to use?
Yes—everything on the site is free. You can use any tool without sign-up.
Do you store my data?
No. Calculations run in your browser and inputs are not saved on our servers. See Legal & Privacy for details.
Can I request a new tool?
Absolutely. Use the Request a Tool form to suggest features or new calculators.
How accurate are the results?
Formulas and assumptions are documented on each tool page. Results are for education and planning—not financial, medical or legal advice.
Do the Random & Math tools cover number-draw formats?
Yes. The Random & Math hub includes pure random generators and educational probability tools that support common number-draw formats.