Calculate anything, instantly.
Numeros gives you fast, accurate calculators for finance, health, math and everyday life — built by a small team obsessed with getting the numbers right.
Browse by category
Eleven focused collections. Edit the names and links by hand as you publish each calculator.
Financial
Loans, mortgages, interest, tax, savings
- Mortgage Calculator
- Loan Calculator
- Auto Loan Calculator
- Compound Interest Calculator
- Simple Interest Calculator
- Retirement Calculator
- Investment Calculator
- Income Tax Calculator
- Salary Calculator
- Savings Calculator
- Credit Card Payoff Calculator
- Debt Payoff Calculator
- Student Loan Calculator
- Rent vs. Buy Calculator
- Net Worth Calculator
- CD Calculator
- Refinance Calculator
- Home Affordability Calculator
- Debt-to-Income Ratio Calculator
- Budget Calculator
- Emergency Fund Calculator
- Inflation Calculator
- Rule of 72 Calculator
- VAT Calculator
- Amortization Schedule Calculator
- 401(k) Calculator
- Down Payment Calculator
- Mortgage Payoff Calculator
- APR Calculator
- Gold Calculator
- VA Disability Calculator
- Interest Rate Calculator
Health
BMI, calories, body fat, pregnancy
- BMI Calculator
- Calorie Calculator
- Body Fat Calculator
- BMR Calculator
- Ideal Weight Calculator
- Pregnancy Due Date Calculator
- Ovulation Calculator
- Macro Calculator
- Water Intake Calculator
- Target Heart Rate Calculator
- Protein Intake Calculator
- TDEE Calculator
- One-Rep Max Calculator
- Blood Alcohol Calculator
- Waist-to-Hip Ratio Calculator
- Pace Calculator
- Lean Body Mass Calculator
- Calories Burned Calculator
- Period Calculator
- Pregnancy Weight Gain Calculator
- Body Surface Area Calculator
Math
Percentages, fractions, algebra, geometry
- Percentage Calculator
- Fraction Calculator
- Scientific Calculator
- Standard Deviation Calculator
- Quadratic Formula Calculator
- Ratio Calculator
- Area Calculator
- Volume Calculator
- Circle Calculator
- Triangle Calculator
- Square Root Calculator
- Exponent Calculator
- Average Calculator
- Probability Calculator
- Percent Error Calculator
- Pythagorean Theorem Calculator
- GCF and LCM Calculator
- Slope Calculator
- P-Value Calculator
- Confidence Interval Calculator
- Log Calculator
- Significant Figures Calculator
- Scientific Notation Calculator
- Odds Calculator
- Graphing Calculator
- Limit Calculator
- Matrix Calculator
- System of Equations Calculator
- Long Division Calculator
- Factoring Calculator
- Rounding Calculator
- Percentile Calculator
- Summation Calculator
Date & Time
Age, countdown, duration, work days
- Age Calculator
- Date Difference Calculator
- Countdown Calculator
- Business Days Calculator
- Add/Subtract Date Calculator
- Time Zone Converter
- Time Duration Calculator
- Day of the Week Calculator
- Week Number Calculator
- Time Card Calculator
- Sleep Calculator
- Hours Calculator
- Unix Timestamp Converter
- Leap Year Calculator
- Moon Phase Calculator
Construction
Concrete, paint, flooring, roofing
Engineering
Electrical, mechanical, structural
- Ohm's Law Calculator
- Voltage Drop Calculator
- Resistor Color Code Calculator
- Horsepower Calculator
- BTU Calculator
- Wire Gauge Calculator
- Flow Rate Calculator
- Pressure Converter
- Solar Panel Size Calculator
- Gear Ratio Calculator
- Torque Calculator
- Beam Load Calculator
- LED Resistor Calculator
- Capacitor Calculator
- Power Factor Calculator
Physics
Motion, energy, force, waves
- Velocity Calculator
- Acceleration Calculator
- Force Calculator
- Work Calculator
- Power Calculator
- Kinetic Energy Calculator
- Gravitational Potential Energy Calculator
- Momentum Calculator
- Impulse-Momentum Calculator
- Hooke's Law Calculator
- Centripetal Force Calculator
- Projectile Motion Calculator
- Free Fall Calculator
- Wavelength Calculator
- AP Physics Score Calculator
Business
Margin, ROI, payroll, break-even
- Profit Margin Calculator
- Break-Even Point Calculator
- Payroll Calculator
- Sales Tax Calculator
- Markup Calculator
- ROI Calculator
- Inventory Turnover Calculator
- Cash Flow Calculator
- Business Valuation Calculator
- Commission Calculator
- Discount Calculator
- CAGR Calculator
- Depreciation Calculator
- Customer Lifetime Value Calculator
- Freelance Rate Calculator
- Employee Cost Calculator
- Salary to Hourly Calculator
- Net Profit Calculator
- Startup Costs Calculator
Education
GPA, grade average, test scores
- GPA Calculator
- Grade Calculator
- Weighted Grade Calculator
- Final Exam Grade Calculator
- Test Score Calculator
- Study Time Planner
- Class Rank Calculator
- Reading Time Calculator
- Word Counter
- College Cost Calculator
- Semester GPA Calculator
- Grade Curve Calculator
- Letter Grade to GPA Calculator
- Target GPA Calculator
- Word Count to Pages Calculator
Lifestyle
Cooking, travel, everyday tools
Converters
Units, currency, measurements
- Currency Converter
- Volume Converter
- Temperature Converter
- Length Converter
- Weight Converter
- Speed Converter
- Area Converter
- Roman Numeral Converter
- Shoe Size Converter
- Color Converter (HEX/RGB)
- Binary/Hex Converter
- Data Storage Converter
- Fuel Economy Converter
- Time Converter
- Angle Converter
- Energy Converter
- Power Converter
- Oven Temperature Converter
- Pressure Converter
- Time Zone Converter
Generators
Passwords, QR codes, random picks
Built differently
Most calculator sites are cluttered and slow. We started over.
Fast, on any device
No bloated scripts or intrusive pop-ups — just a calculator that loads instantly, even on a slow connection.
Formulas you can check
Every tool shows the exact formula and a worked example, so you understand the answer, not just see it.
Free, always
No account, no paywall, no email required. Every calculator on the site is free to use, in full.
Frequently asked questions
Are the calculators on this site really free?
Yes. Every calculator is free to use, with no account, subscription, or hidden limits.
How accurate are the results?
Each tool uses the standard, published formula for its category, shown directly on the page so you can verify it yourself. For decisions involving money, health, or legal matters, use the results as a starting point and confirm with a qualified professional.
Can I use these calculators on my phone?
Yes, every calculator is fully responsive and designed mobile-first.
Do you store the numbers I enter?
No. Calculations run entirely in your browser — nothing you type is sent to a server or saved.
Numeros
Numeros is a free calculator platform covering finance, health, math, construction, business, and everyday life. Every tool ships with the full formula, a worked example, and plain-English explanations, so you understand the number, not just see it. Nothing you type is sent to a server or stored - every calculation runs directly in your browser.
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