Scientific • Algebra • Memory • History
Basic, Scientific, and Algebraic math with full history log and keyboard shortcuts.
Amortizing Loans, Auto financing, Salary conversions, Credit payoff, and Growth calculations.
Track BMI, Mifflin-St Jeor BMR, daily Calorie needs, Navy Body Fat, and Pregnancy milestones.
Dynamic conversions for Length, Weight, Temp, Volume, Area, Speed, Data, Pressure, and Energy.
Keep tabs on weighted class grades and calculate term GPAs on standard scales.
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Monthly Payment • Total Interest • Amortization
Loan Details
Results
Amortization Schedule
Standard amortizing loan formula. Results are estimates only.
Vehicle Price • Trade-in • Financing
Vehicle Details
Results
Amortization Schedule
Vehicle financing estimate only. Taxes, fees, and insurance not included.
US Federal Income Tax • Progressive Brackets
Input Details
Projected brackets based on inflation trends. Not yet finalized by IRS.
This shows gross federal tax only. Actual liability may be lower after deductions, credits, and other adjustments.
Results
Bracket Breakdown
Based on IRS published federal tax brackets. For estimation purposes only.
Body Mass Index • Health Category
Your Measurements
BMI is a screening tool, not a diagnostic one. It doesn't account for muscle mass, bone density, or body composition. Consult a healthcare provider for a full assessment.
Results
All Categories
Based on WHO BMI classification. For informational purposes only.
Calculate age from birthdate
Details
Result
Based on standard gregorian calendar age calculations.
Percent of a number • Percent change • Increase or decrease
Result
Percentage results are rounded to 4 decimal places where applicable.
Calculate semester GPA on a 4.0 scale
Courses
Result
Courses with empty grades or credits will be excluded from the GPA calculation.
Standard letter weights: A+/A=4.0, A-=3.7, B+=3.3, B=3.0, B-=2.7, C+=2.3, C=2.0, C-=1.7, D+=1.3, D=1.0, F=0.0
Calculate your overall class grade based on weighted categories
Assignment Groups
Class Grade
Grade ranges: A ≥ 90%, B ≥ 80%, C ≥ 70%, D ≥ 60%, F < 60%.
Supports weights normalization to calculate correct standing mid-semester.
Convert between hourly, weekly, biweekly, monthly & yearly pay
Income Details
Converted Amounts
Based on a 52-week year. Overtime, bonuses, and deductions not included.
Payoff time • Total interest • Extra payment impact
Card Details
Payoff Summary
Assumes consistent payments with no new charges. Actual results may vary.
Compound interest • Investment growth • Monthly contributions
Investment Details
Results
Based on monthly compounding. Does not account for taxes, fees, or inflation.
APR to APY • Compounding comparison • Effective rate
Rate Details
Results
Compounding Comparison
APY = (1 + APR/n)^n − 1 where n is compounding periods per year.
Before-tax price • After-tax total • Reverse calculation
Calculation Mode
Reverse mode calculates the original price before tax from the total amount you paid.
Results
Sales tax rates vary by state and locality. This is for estimation purposes only.
BMR • TDEE • Calories for weight goals
Your Details
Results
Calories for Goals
Based on the Mifflin-St Jeor equation. Individual needs may vary. Consult a professional.
Navy circumference method • Body fat percentage
Body Measurements
Results
Body fat estimation using US Navy circumference method. Accuracy may vary.
Basal Metabolic Rate • Multiple formulas • Comparison
Your Details
Formula Comparison
Daily Calories at Activity Levels
Formulas: Mifflin-St Jeor (1990), Revised Harris-Benedict (1984), Katch-McArdle (requires body fat %).
Due date • Current week • Trimester • Milestones
Dates
Results
Key Milestones
Based on standard 40-week gestational calculation. Due date is an estimate — only ~5% of births occur exactly on the EDD.
Date difference • Add & subtract days
From / To
Date
Result
Date calculations use standard Gregorian calendar accounting for month lengths and leap years.
Add & subtract time • Convert between units
Time Values
Convert From
Convert To
Result
Time calculations assume 24-hour format. Negative results shown as —.
Work hours • Shift duration • Earnings
Shift Details
Earnings (optional)
Results
Overtime, double time, and payroll deductions are not included.
Length • Weight • Temp • Volume • Area • Speed • Data • Pressure • Energy
Quick Conversions
1 × base = resultAll conversions are approximate and rounded to 6 decimal places where applicable.
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