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Explore.
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Worked exams →Order of operations, fractions, percents, ratios, GCF & LCM.
1 worked examSigned numbers, exponents, one-variable equations, and the coordinate plane.
1 worked examLinear & quadratic equations, systems, polynomials, logarithms, complex numbers, and symbolic factor/expand/simplify.
2 worked examsArea, volume, the Pythagorean theorem, the laws of sines & cosines.
1 worked examRight-triangle & unit-circle trig, identities, polar form, the laws of sines & cosines.
1 worked examCenter & spread, z-scores, correlation, confidence intervals, the empirical rule.
1 worked examClassical & conditional probability, complements, the binomial distribution, expected value.
1 worked examThe multiplication principle, permutations, combinations, and the binomial theorem.
1 worked examDivisibility, GCD/LCM, modular arithmetic, Fibonacci, and base conversion.
1 worked examClosed-form sums, counting subsets, inclusion–exclusion, pigeonhole, and recurrences.
1 worked examLimits, derivatives, integrals, series, and multivariable calculus.
7 worked examsDot & cross products, gradient/divergence/curl, line & surface integrals, Stokes & the divergence theorem.
1 worked examMatrices, determinants, linear systems, eigenvalues & eigenvectors.
2 worked examsFirst/second-order ODEs, Laplace transforms, and applied dynamics.
5 worked examsStatics, dynamics, circuits, thermo, fluids — worked with units.
6 worked examsMechanics, electromagnetism & waves.
2 worked examsFeatured
- BMI Calculator
Calculate your Body Mass Index from height and weight.
- Calorie Deficit
Calculate your TDEE and calorie targets for weight loss using the Mifflin-St Jeor equation.
- Car Loan
Calculate monthly car payments, total cost, and interest.
- Compound Interest
See how your investments grow with the power of compound interest over time.
- Discount & Tax
See the final price after discount and sales tax — with effective savings.
- Electricity Bill
Estimate your monthly electricity bill from appliance usage.
Calculate your Body Mass Index from height and weight.
Calculate your TDEE and calorie targets for weight loss using the Mifflin-St Jeor equation.
Calculate monthly car payments, total cost, and interest.
See how your investments grow with the power of compound interest over time.
All calculators
- Fuel CostCalculate fuel costs for trips and estimate your monthly/yearly gas budget.
- Hourly to SalaryConvert hourly rates to annual salary with tax deductions and overtime.
- Mortgage CalculatorCalculate monthly payments, total interest, and lifetime cost for any home loan.
- Profit MarginCalculate gross margin, operating margin, and markup from revenue and costs.
- Recipe ScalerScale any recipe up or down with automatic metric conversions.
- Rent vs BuyCompare the monthly cost of renting versus buying a home.
- Retirement PlannerProject your retirement savings growth and estimated monthly income.
- Running PaceCalculate your required pace, speed, and split times for any race distance.
- Sales TaxCalculate sales tax forward and reverse.
- Savings GoalCalculate the monthly savings needed to reach your financial goal on time.
- Tax BracketEstimate your federal income tax and effective tax rate.
- Temperature ConverterConvert between Fahrenheit, Celsius, and Kelvin with common benchmarks.
- Tip CalculatorCalculate tips at any percentage and split the bill evenly between friends.
- Water IntakeCalculate daily water needs based on weight and activity level.
- 1031 Exchange TimelineTrack critical identification and exchange deadlines for 1031 tax swaps.
- 401k ContributionEstimate annual 401(k) contributions, employer match, and 30-year growth at 7% return.
- Kitchen SinkEvery working decorator + row type — the canonical reference. Visit with ?lab to flip styles and check coverage.
- 📊 Chart ShowcaseEvery visualization Instacalc draws — each from a one-line function call over plain data.
- AC Impedance RLC CircuitCalculate total impedance and phase angle for AC circuits.
- Accelerationa = (v − v₀) / t — average acceleration from change in velocity over time.
- Account Receivable DaysCalculate days sales outstanding and collection efficiency from receivables and credit sales.
- ADA Compliance GapIdentify features needed to meet ADA accessibility standards.
- Aerodynamic Drag Frontal AreaCalculate aerodynamic drag force.
- After Repair ValueEstimate the market value of a property after all renovations.