The complete library
Every calculator, one place.
313 live calculators across 6 categories. Every page is built from a JSON config, computed by a unit-tested formula, and cited to primary sources only.
313 calculators6 categories100% primary-source cited
Education
GPA, SAT/ACT scores, weighted grades, college cost projection.
Everyday
Time, date, tip, shopping, travel, food, sleep, dating.
- AC BTU Calculator
- Age Calculator
- Aquarium Volume Calculator
- Baseboard Trim Calculator
- Board Foot Calculator
- Brick Calculator
- Carpet Square Footage Calculator
- Caulk Calculator
- Concrete Volume Calculator
- Cooking Converter
- Date Difference Calculator
- Deck Board Calculator
- Deck Stair Stringer Calculator
- Discount Calculator
- Driveway Sealer Calculator
- Drywall Calculator
- Drywall Mud Calculator
- Electricity Cost Calculator
- Fence Calculator
- Fence Post Concrete Calculator
- Firewood Cord Calculator
- French Drain Gravel Calculator
- Fuel Cost Calculator
- Generator Size Calculator
- Gravel Calculator
- Gutter Size Calculator
- Insulation Calculator
- KPLC Token Cost Calculator
- Laminate Flooring Calculator
- Lawn Fertilizer Calculator
- M-Pesa Fee Calculator
- Moving Box Calculator
- Moving Truck Size Calculator
- MPG Calculator
- Mulch Calculator
- Nairobi Water Bill Calculator
- Paint Cost Calculator
- Paint Coverage Calculator
- Paver Calculator
- Plywood Sheet Calculator
- Pool Volume Calculator
- Rainwater Harvesting Calculator
- Rebar Calculator
- Recipe Scaler
- Retaining Wall Block Calculator
- Roofing Shingle Calculator
- Safaricom Data Bundle Calculator
- Septic Tank Size Calculator
- Siding Calculator
- Sleep Calculator
- Sod Calculator
- Solar Panel Size Calculator
- Stair Calculator
- Tile Calculator
- Time Zone Converter
- Tip Calculator
- Topsoil Calculator
- Unit Converter
- Wallpaper Calculator
- Water Heater Size Calculator
- Wedding Budget Calculator
- Word Counter
Finance
Mortgages, loans, taxes, investing, retirement, crypto, insurance.
- 401(k) Retirement Calculator
- Adjustable-Rate Mortgage Calculator
- Amortization Schedule
- Annual Salary Calculator
- APR Calculator
- Balance Transfer Calculator
- Biweekly Mortgage Calculator
- Bond Yield to Maturity Calculator
- Break-Even Point Calculator
- Bridge Loan Calculator
- Cap Rate Calculator
- Capital Gains Tax Calculator
- Car Loan Calculator
- Cash-on-Cash Return Calculator
- CD Calculator
- Closing Costs Calculator
- Compound Interest Calculator
- Credit Card Interest Calculator
- Credit Card Minimum Payment Calculator
- Credit Card Payoff Calculator
- Credit Score Calculator
- Debt Avalanche Calculator
- Debt Service Coverage Ratio Calculator
- Debt Snowball Calculator
- Debt-to-Income Ratio Calculator
- Depreciation Calculator
- Dividend Yield Calculator
- Down Payment Calculator
- Emergency Fund Calculator
- Expense Ratio Cost Calculator
- Extra Payment Calculator
- FHA Loan Calculator
- FICA Tax Calculator
- Front-End Ratio Calculator
- Future Value Calculator
- Gross Rent Multiplier Calculator
- Home Equity Line of Credit Calculator
- Home Equity Loan Calculator
- Homeowners Insurance Calculator
- Inflation Calculator
- Interest-Only Mortgage Calculator
- Investment Property ROI Calculator
- Jumbo Mortgage Calculator
- Kenya Advance Tax Calculator
- Kenya Housing Levy Calculator
- Kenya Import Duty Calculator
- Kenya Land Rates Calculator
- Kenya NITA Levy Calculator
- Kenya Pension Calculator
- Kenya Residential Rental Income Tax Calculator
- Kenya Stamp Duty Calculator
- Kenya Withholding Tax Calculator
- KRA Capital Gains Tax Calculator
- KRA Corporation Tax Calculator
- KRA Fringe Benefit Tax Calculator
- KRA PAYE Calculator
- KRA Turnover Tax Calculator
- KRA VAT Calculator
- Loan Comparison Calculator
- Loan Constant Calculator
- Loan Repayment Calculator
- Loan-to-Value Ratio Calculator
- Long-Term Capital Gains Tax Calculator
- Markup Calculator
- Mortgage Affordability Calculator
- Mortgage Calculator
- Mortgage Payoff Calculator
- Mortgage Points Calculator
- Mortgage Refinance Calculator
- Net Worth Calculator
- NOI Calculator
- NSE Returns Calculator
- NSSF Contribution Calculator
- Pension Lump Sum Calculator
- PMI Calculator
- Profit Margin Calculator
- Property Tax Calculator
- Qualified Dividend Tax Calculator
- Quarterly Tax Estimator
- Refinance Break-Even Calculator
- Rent vs Buy Calculator
- Rental Yield Calculator
- Retirement & FIRE Calculator
- Reverse Mortgage Calculator
- ROI Calculator
- Rule of 72 Calculator
- Sales Commission Calculator
- Sales Tax Calculator
- Savings Goal Calculator
- Self-Employment Tax Calculator
- Sharpe Ratio Calculator
- Short-Term Capital Gains Tax Calculator
- Simple Interest Calculator
- Social Security Benefit Calculator
- Stock Return Calculator
- Treasury Bill Yield Calculator
- Yield Maintenance Calculator
Health
BMI, nutrition, fitness, pregnancy, medical dosing, mental health.
- Alcohol Calories Calculator
- Anion Gap Calculator
- Blood Pressure Calculator
- Blood Sugar Calculator
- BMI Calculator
- BMI Calculator for Children
- BMR Calculator
- Body Fat Calculator
- Body Frame Size Calculator
- Body Surface Area Calculator
- Calcium Intake Calculator
- Calorie Burn Calculator
- Calorie Deficit Calculator
- Carbohydrate Intake Calculator
- Child-Pugh Score Calculator
- Cholesterol Ratio Calculator
- Corrected Calcium Calculator
- Corrected Sodium Calculator
- Creatinine Clearance Calculator
- eGFR Calculator
- Fat Intake Calculator
- Fiber Intake Calculator
- HbA1c Calculator
- Heart Rate Zones Calculator
- Hydration Calculator
- Ideal Weight Calculator
- Iron Intake Calculator
- IVF Due Date Calculator
- LDL Cholesterol Calculator
- Lean Body Mass Calculator
- Macros Calculator
- Mean Arterial Pressure Calculator
- MELD-Na Calculator
- Metabolic Age Calculator
- One-Rep Max Calculator
- Ovulation and Fertility Probability Calculator
- Ovulation Calculator
- Pre-Pregnancy BMI Calculator
- Pregnancy Due Date Calculator
- Pregnancy Weight Gain Calculator
- Protein Intake Calculator
- QTc Calculator
- Running Pace Calculator
- SHIF Contribution Calculator
- Sleep Cycle Calculator
- Smoking Cost Calculator
- Sodium Intake Calculator
- Steps to Calories Calculator
- Sugar Intake Calculator
- Target Heart Rate Calculator
- TDEE Calculator
- Vitamin D Intake Calculator
- VO2 Max Calculator
- Waist-to-Height Ratio Calculator
- Waist-to-Hip Ratio Calculator
- Water Intake Calculator
Math
Algebra, geometry, statistics, calculus, number theory, set theory.
- 2D Distance Calculator
- Absolute Value Calculator
- Area & Perimeter Calculator
- Area of a Circle Calculator
- Area of a Rectangle Calculator
- Binomial Coefficient Calculator
- Circumference Calculator
- Combinations with Replacement Calculator
- Completing the Square Calculator
- Complex Number Calculator
- Confidence Interval Calculator
- Cubic Equation Solver
- Cylinder Volume Calculator
- Discriminant Calculator
- Doubling Time Calculator
- Ellipse Area Calculator
- Exponent Calculator
- Factorial Calculator
- Fraction Calculator
- Geometric Mean Calculator
- Half-Life Calculator
- Harmonic Mean Calculator
- LCM and GCD Calculator
- Logarithm Calculator
- Mean, Median, and Mode Calculator
- Mixed Number Calculator
- P-Value Calculator
- Percent Error Calculator
- Percentage Calculator
- Percentage Change Calculator
- Permutation & Combination Calculator
- Prime Factorization Calculator
- Probability Calculator
- Proportion Calculator
- Pythagorean Theorem Calculator
- Quadratic Equation Solver
- Ratio Calculator
- Rounding Calculator
- Scientific Notation Calculator
- Significant Figures Calculator
- Slope Calculator
- Sphere Volume Calculator
- Square Root Calculator
- Standard Deviation Calculator
- Standard Error Calculator
- Triangle Solver Calculator
- Trigonometry Calculator
- Volume Calculator
- Weighted Average Calculator
- Z-Score Calculator
Science
Physics, chemistry, biology, astronomy, engineering, ecology.
- Acceleration Calculator
- Bernoulli Equation Calculator
- Buoyancy Calculator
- Capacitance Calculator
- Centripetal Force Calculator
- Coulomb's Law Calculator
- Density Calculator
- Dew Point Calculator
- Doppler Effect Calculator
- E = mc² Calculator
- Electric Power Calculator
- Electrical Resistance Calculator
- Equilibrium Constant Calculator
- Escape Velocity Calculator
- Force Calculator (F = ma)
- Free Fall Calculator
- G-Force Calculator
- Gravitational Force Calculator
- Gravitational Potential Energy Calculator
- Heat Index Calculator
- Ideal Gas Law Calculator
- Kinetic Energy Calculator
- Latent Heat Calculator
- Lens Equation Calculator
- Molar Mass Calculator
- Molarity Calculator
- Momentum Calculator
- Ohm's Law Calculator
- Orbital Period Calculator
- pH Buffer Calculator
- pH Calculator
- Photon Energy Calculator
- Potential Energy Calculator
- Pressure Calculator
- Projectile Motion Calculator
- Snell's Law Calculator
- Specific Heat Calculator
- Speed Distance Time Calculator
- Spring Force Calculator
- Stefan-Boltzmann Law Calculator
- Terminal Velocity Calculator
- Thermal Expansion Calculator
- Torque Calculator
- Wavelength & Frequency Calculator
- Wind Chill Calculator
- Work-Energy Calculator