Complete Directory of 1,200+ Online Calculators
Showing 396 verified calculation tools — ready to use with no registration.
Add or Subtract Days from Date Calculator
Calculate the resulting calendar date after adding or subtracting X days....
Standard Deviation & Variance Solver 16
Compute sample variance, standard error of the mean, and confidence intervals....
Balloon Payment Loan Calculator 3
Determine monthly installment amounts with remaining lump-sum balloon payment at maturity....
Pregnancy Weight Gain Guideline Calculator 3
Track recommended weekly maternal weight gain ranges based on pre-pregnancy BMI....
Net Worth Calculator
Assess total assets versus total liabilities to discover your true financial net worth....
Inflation Calculator
Calculate the loss of purchasing power over time using historical CPI rates....
Estate & Inheritance Tax Estimator 3
Calculate federal and state estate tax thresholds and generation-skipping levies....
Pregnancy Due Date Calculator
Calculate estimated delivery date based on last menstrual period (LMP)....
Bandwidth Data Cap Usage Calculator
Track streaming and gaming data consumption to avoid ISP data overages....
Body Surface Area (BSA) Calculator 5
Calculate physiological BSA using Mosteller and DuBois clinical formulas....
Salary to Hourly Calculator
Convert annual wage into hourly, weekly, bi-weekly, and monthly paycheck rates....
Pet Age to Human Years Calculator (Dog & Cat)
Accurately convert canine and feline chronological ages into human age....
Creatinine Clearance (Cockcroft-Gault) Calculator 7
Estimate glomerular filtration rate and kidney medication filtration....
Cooking & Baking Recipe Scaling Multiplier
Double, triple, or scale ingredient tablespoons, grams, and cups for any party....
Ohm's Law Calculator (Voltage, Current, Resistance)
Calculate electrical voltage, amperage, resistance, and wattage with V = I × R....
Military Body Fat Tape Calculator 2
Calculate DoD physical readiness tape test body fat compliance....
Car Lease vs Buy Cost Comparison Calculator
Compare 3-year leasing cash flows against outright vehicle ownership....
Quarterly Estimated 1099 Tax Calculator 3
Calculate quarterly self-employment tax, Social Security, and Medicare obligations....
Pre-Payment Mortgage Amortization Shortcut Calculator 3
Calculate how an extra $100 or $250 monthly principal payment cuts mortgage life....
Military Body Fat Tape Calculator 5
Calculate DoD physical readiness tape test body fat compliance....
Baby Feeding & Formula Intake Calculator 3
Determine daily ounces of breast milk or formula based on infant body weight....
Standard Deviation & Variance Solver 6
Compute sample variance, standard error of the mean, and confidence intervals....
Quadratic Equation Solver
Find real and complex roots for ax² + bx + c = 0 with full steps....
Video File Size & Bitrate Calculator
Estimate rendering gigabytes based on 4K/1080p bitrate and run length....
Dividend Yield & DRIP Reinvestment Calculator 2
Calculate annual cash dividend income and the exponential power of DRIP compounding....
Polynomial Root & Factor Solver 17
Factor complex polynomials and find algebraic roots with step-by-step guidance....
FHA Loan Calculator 2
Calculate FHA mortgage monthly payments with upfront and annual mortgage insurance premiums (MI...
HELOC Payment Calculator 4
Compute monthly draw period interest and subsequent repayment period balances....
DOT Physical BMI & Neck Size Apnea Calculator 4
Evaluate commercial driver sleep apnea screening risk factors....
Mean Arterial Pressure (MAP) Calculator 7
Calculate average arterial perfusion pressure from systolic and diastolic numbers....
Precision Ratio & Scale Calculator 12
Calculate proportional unit scaling for technical diagrams and physical blueprints....
Polynomial Root & Factor Solver 14
Factor complex polynomials and find algebraic roots with step-by-step guidance....
Unit Rate & Comparative Cost Calculator 11
Determine lowest cost per ounce, pound, or liter across different package sizes....
Refinance Break-Even Calculator
Determine how many months it takes for mortgage savings to offset closing costs....
Linear Interpolation & Extrapolation Calculator 3
Find intermediate values between discrete engineering data points....
Linear Interpolation & Extrapolation Calculator 16
Find intermediate values between discrete engineering data points....