Calculator Suite
Free online calculators for math, finance, health, and more — fast and accurate.
📐 Math Calculators
- Percentage CalculatorSolve all percentage problems
- Fraction CalculatorAdd, subtract, multiply, divide fractions
- Quadratic FormulaSolve ax² + bx + c = 0 with real or complex roots
- GCF & LCM CalculatorGreatest common factor and least common multiple
- Scientific NotationConvert between decimal and scientific notation
- Right TriangleSolve sides, angles, area via Pythagorean theorem
- Standard DeviationMean, median, mode, range, variance, and std dev
- Percent ErrorCompare experimental to theoretical value
- Percentage DifferencePercent difference between two values
- Tip CalculatorGratuity & bill split between any number of people
- Discount CalculatorSale price, discount %, or list price
- Sales Tax CalculatorAdd or extract sales tax from a price
- Vote PercentageElection & poll vote share with winner
- Descriptive StatisticsFull stats: skewness, kurtosis, quartiles, CV
- Quartile & IQRQ1, Q2, Q3, IQR with outlier detection
- Percentile CalculatorNth percentile + every-5th-percentile table
- Z-Score CalculatorThree methods: raw value, sample, two-sample
- Combinations & PermutationsnCr, nPr — with or without replacement
- Factorial Calculatorn!, n!!, n!!! — arbitrary precision
- Pascal's TriangleGenerate any number of rows
- Fibonacci CalculatorNth term, sequence & golden ratio
- Permutation VariantsEven, odd, and circular permutations
📏 Geometry Calculators
- Circle & AnnulusArea, radius, circumference, diameter, ring area
- Rectangle & SquareArea, perimeter, and diagonal
- Parallelogram & RhombusArea, perimeter, height, diagonals
- Regular PolygonArea, perimeter, apothem, angles (3–14 sides)
- Pythagorean TheoremSolve for hypotenuse or either leg
- Triangle SolverSSS, SAS, ASA, AAS — full solution
- CubeSurface area, volume, diagonals
- Rectangular PrismVolume, surface area, space diagonal
- Sphere & HemisphereSurface area, volume, circumference
- CylinderBase, lateral, total area + volume
- ConeSlant height, surface area, volume
🎓 School Calculators
- GPA CalculatorGrade point average on the 4.0 scale
- Final Exam GradeScore needed on the final to hit your target
- Weighted GradeCourse grade from weighted assignments
💰 Finance Calculators
- Mortgage CalculatorPITI breakdown with tax & insurance
- Amortization CalculatorFull schedule + extra payment impact
- Mortgage Payoff CalculatorSave time & interest with extra payments
- FHA Loan CalculatorPayment with FHA mortgage insurance (MIP)
- VA Mortgage CalculatorVA loan with funding fee estimation
- Home Equity LoanBorrow against your home equity
- HELOC CalculatorDraw & repayment phase payments
- Auto Loan CalculatorCar payment with tax, trade-in & fees
- Auto Lease CalculatorLease payment from cap cost & money factor
- Interest CalculatorSimple or compound interest with growth table
- Compound InterestGrow savings with compound interest
- Interest Rate CalculatorFind implied simple or compound rate (CAGR)
- Simple Interest CalculatorI = P × r × t with daily & monthly breakdown
- CD CalculatorCertificate of Deposit balance & APY
- Bond CalculatorBond price from coupon rate & market yield
- Loan CalculatorMonthly payment & amortization table
- EMI CalculatorEquated Monthly Installment for any loan
- Affordability CalculatorMax loan, car, or house from your monthly payment
- Interest-Only MortgageIO phase + amortizing phase payments
- Property Tax CalculatorAnnual & monthly tax (% or mill rate)
- Loan Comparison TablePayment matrix across rates and terms
- Equal Principal AmortizationSchedule with fixed principal each month
- APR CalculatorTrue APR including loan fees & origination
- Effective Annual Rate (EAR)Nominal → effective at any compounding
- Nominal Rate CalculatorEffective → nominal stated rate
- Rate ConversionAnnual → periodic; equivalent across frequencies
- Present Value (PV)Lump sum, annuity, growing annuity + PVIF/PVIFA
- Future Value (FV)Lump sum, annuity, growing annuity + FVIF/FVIFA
- PV of Cash FlowsDiscount even or uneven cash flows
- FV of Cash FlowsCompound cash flows forward to a future date
- Net Present Value (NPV)Investment evaluation with decision rule
❤️ Health Calculators
- BMI CalculatorBody Mass Index for adults
- Period CalculatorPredict next periods, ovulation & fertile window
- Pregnancy CalculatorDue date, conception, current week & trimesters
- Animal GestationDue dates for 17 species — dogs, cats, cattle…
- Pace CalculatorRunning pace, finish time, race splits
- Target Heart RateMax HR & training zones (Tanaka/Fox/Karvonen)
📅 Date & Time
- Date CalculatorDays between dates & date math