All Online Calculators Directory
Showing 396 verified calculators ready for instant, mobile-friendly calculations.
Pregnancy Weight Gain Guideline Calculator 2
Track recommended weekly maternal weight gain ranges based on pre-pregnancy BMI....
Bi-Weekly Mortgage Payment Calculator 4
Discover how making 26 bi-weekly payments shaves years and thousands in interest off your mortg...
Quarterly Estimated 1099 Tax Calculator 3
Calculate quarterly self-employment tax, Social Security, and Medicare obligations....
Calorie Calculator
Determine daily caloric intake required for weight loss, maintenance, or muscle gain....
Bond Yield to Maturity (YTM) Calculator 3
Calculate internal rate of return for fixed-income municipal and treasury bonds....
Add or Subtract Days from Date Calculator
Calculate the resulting calendar date after adding or subtracting X days....
Commission & Bonus Tax Withholding Calculator 2
Determine flat supplemental wage tax withholdings on performance bonuses....
Reverse Mortgage Calculator 2
Estimate Home Equity Conversion Mortgage (HECM) proceeds for homeowners aged 62+....
Child Height Predictor Calculator 2
Estimate adult height using the mid-parental Khamis-Roche statistical algorithm....
Linear Interpolation & Extrapolation Calculator 10
Find intermediate values between discrete engineering data points....
One Rep Max (1RM) Calculator
Predict your maximal lift weight from sub-maximal repetitions using Brzycki equation....
Target Heart Rate Calculator
Find optimal aerobic and anaerobic training zones based on age and resting pulse....
Military Body Fat Tape Calculator 6
Calculate DoD physical readiness tape test body fat compliance....
Body Surface Area (BSA) Calculator 3
Calculate physiological BSA using Mosteller and DuBois clinical formulas....
Simple Interest Calculator
Determine basic interest earned or paid without compounding cycles....
Class Test Curve Calculator
Calculate bell curve score adjustments and linear standard deviations....
Target Heart Rate Karvonen Formula Calculator 5
Calculate precise aerobic heart zones using heart rate reserve (HRR)....
Standard Deviation Calculator
Compute population and sample standard deviation, variance, and mean....
Target Heart Rate Karvonen Formula Calculator 4
Calculate precise aerobic heart zones using heart rate reserve (HRR)....
Pregnancy Weight Gain Guideline Calculator 3
Track recommended weekly maternal weight gain ranges based on pre-pregnancy BMI....
Student Loan Refinance Calculator
Compare new interest rates and monthly savings when refinancing college debt....
Unit Rate & Comparative Cost Calculator 14
Determine lowest cost per ounce, pound, or liter across different package sizes....
Gravel & Mulch Yardage Calculator
Calculate tons or cubic yards of aggregate, pea gravel, and landscaping mulch....
Katch-McArdle BMR Calculator 3
Calculate resting metabolic rate based purely on lean body tissue mass....
HELOC Payment Calculator 3
Compute monthly draw period interest and subsequent repayment period balances....
Quadratic Equation Solver
Find real and complex roots for ax² + bx + c = 0 with full steps....
Mean Arterial Pressure (MAP) Calculator 7
Calculate average arterial perfusion pressure from systolic and diastolic numbers....
Linear Interpolation & Extrapolation Calculator 12
Find intermediate values between discrete engineering data points....
Loan Calculator
Compute monthly payments, total interest, and amortization schedule for any fixed-rate loan....
Stair Stringer & Rise/Run Calculator
Calculate total rise, run, tread depth, and stringer angle conforming to building code....
Linear Interpolation & Extrapolation Calculator 17
Find intermediate values between discrete engineering data points....
Precision Ratio & Scale Calculator 15
Calculate proportional unit scaling for technical diagrams and physical blueprints....
Sleep Cycle Calculator
Optimize bedtime and wake times around 90-minute REM sleep cycles....
Wilks Score Strength Calculator 6
Compare powerlifting strength across different body weight classes....
Unit Rate & Comparative Cost Calculator 13
Determine lowest cost per ounce, pound, or liter across different package sizes....
Balloon Payment Loan Calculator 4
Determine monthly installment amounts with remaining lump-sum balloon payment at maturity....