New and Updated View all →
Grades & School View all →
- Final Grade CalculatorWhat do you need on the final to hit your target grade?
- GPA CalculatorCollege GPA from letter grades and credit hours on the 4.0 scale.
- Grade CalculatorYour current course grade from assignment scores and weights, with the letter grade.
- High School GPA CalculatorWeighted and unweighted high school GPA, with Honors and AP/IB bumps applied.
- Test Grade CalculatorPoints or questions missed → percentage, letter grade, grading chart.
- Weighted Grade CalculatorCombine homework, quiz, and exam category grades by syllabus weight.
Math View all →
- Average CalculatorMean, median, sum, min, max, and range from any list of numbers.
- Circle CalculatorSolve any circle from one known value, with the steps shown.
- Cone Volume CalculatorVolume, slant height, and surface area of a cone, steps included.
- Cylinder Volume CalculatorVolume, surface area, and gallons from radius or diameter and height.
- Decimal CalculatorExact decimal arithmetic: 0.1 + 0.2 really is 0.3 here.
- Delta-V CalculatorRocket equation: delta-v from mass ratio and engine Isp.
- Derivative CalculatorStep-by-step derivatives of polynomials, trig, exponentials and logs, every rule shown.
- Distance Formula CalculatorStraight-line distance between any two points, plus the midpoint.
- Fraction CalculatorAdd, subtract, multiply, or divide fractions, simplified automatically.
- GCF CalculatorGCF and LCM of up to 6 numbers, with factor lists and steps.
- Golden Ratio CalculatorSplit any length in the golden ratio or check two numbers against phi.
- Height Convertercm to feet & inches and back: exact math, with meters.
- Integral CalculatorType f(x), set your bounds, get the definite integral: six decimals, no fuss.
- Least Squares Regression CalculatorPaste x,y points and get the best-fit line, r, and r² in one click.
- LLM API Cost CalculatorPrice your monthly GPT, Claude & Gemini API bill by tokens and request volume.
- Long Division CalculatorLong division worked one digit at a time, with the full bracket layout.
- Matrix Calculator2×2 and 3×3 matrices: add, subtract, multiply, determinant, inverse.
- Mean Value Theorem CalculatorFind every c where the tangent slope equals the average slope on [a, b].
- Midpoint CalculatorMidpoint between two points, or the missing endpoint from a midpoint.
- Percentage CalculatorPercent of a number, percent-of, and percent change in one tool.
- Percentage Difference CalculatorThe symmetric % gap between two values; order doesn't matter.
- Polar Coordinates CalculatorConvert (x, y) to (r, θ) and back: degrees or radians, quadrant included.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0: real, repeated, or complex roots.
- Ratio CalculatorSimplify ratios to lowest terms or solve A:B = C:X proportions.
- Right Triangle CalculatorTwo facts in, the whole right triangle out, steps included.
- Rounding CalculatorRound to any place value or sig figs, with all the common roundings side by side.
- Scientific Notation CalculatorConvert to and from scientific notation, plus multiply or divide, with steps.
- Slope CalculatorSlope, y-intercept, and line equation from any two points.
- Sphere Volume CalculatorVolume of a sphere from radius, diameter, circumference, or surface area.
- Square Footage CalculatorAdd up to three shapes, get total area and project cost.
- Square Root CalculatorDecimal answer plus exact simplified radical form, steps included.
- Temperature ConverterFahrenheit, Celsius, and Kelvin: enter one, get all three.
- Triangle CalculatorSolve any triangle: SSS, SAS, ASA, AAS, or SSA with full steps.
- Velocity CalculatorSolve v = d/t for speed, distance, or time, in any units.
- Weight Converterkg to lbs and back, plus stones, ounces, and grams.
- Weighted Average CalculatorWeighted average of any set of numbers with custom weights.
- y = mx + b CalculatorSlope-intercept equation from two points, a slope, or an intercept.
Statistics View all →
- Combination CalculatornCr and nPr with step-by-step work, plus which one you actually need.
- Confidence Interval CalculatorConfidence interval and margin of error for a sample mean.
- MTG Opening Hand CalculatorExact odds of drawing your card: opener, by turn, and mulligans.
- NBA Win Probability CalculatorTurn an NBA spread or moneyline into an honest chance of winning outright.
- NFL Win Probability CalculatorPoint spread in, outright win probability out, with the vig stripped away.
- NHL Win Probability CalculatorMoneylines to fair win odds, or Poisson goals math with overtime handled honestly.
- Normal Distribution CalculatorBell curve probability: below, above, or between any values.
- Odds CalculatorConvert American, decimal, and fractional odds, and see the vig hiding in the price.
- Probability CalculatorSingle events, and/or combinations, and at-least-once odds with steps.
- P-Value CalculatorP-value from a z-score: two-tailed, left-tailed, or right-tailed.
- Standard Deviation CalculatorSample or population standard deviation from any list of numbers.
- Variance CalculatorSample or population variance, plus mean and standard deviation.
- WNBA Win Probability CalculatorSpread or moneyline in, win probability out, with the sigma assumption said out loud.
- Z-Score CalculatorHow many standard deviations from the mean, with percentile.
Finance & Money View all →
- 401k Catch-Up CalculatorYour 2026 limit, the new Roth mandate, and what catch-ups are worth.
- 529 CalculatorBalance at college start, year-by-year coverage, and the gap priced.
- Amortization CalculatorThe full payment-by-payment schedule, payoff date, and extra-payment savings.
- Annuity Payout CalculatorMonthly annuity payments, payout duration, or a lottery annuity schedule.
- BAH CalculatorOfficial 2026 rates: every MHA, every grade, with and without dependents.
- Capital Gains Tax CalculatorTax on a property sale after basis, selling costs, and the home-sale exclusion.
- Car Loan CalculatorReal payment with trade-in, tax, and fees, plus every term priced side by side.
- CD Ladder CalculatorYour ladder vs all-long vs all-short, with a rung maturing every year.
- Closing Cost CalculatorItemized buyer closing-cost ranges and cash to close, from price and down payment.
- Commercial Mortgage CalculatorPayment, balloon due at maturity, and DSCR for commercial property loans.
- Compound Interest CalculatorWatch savings grow with contributions, year by year.
- Credit Card Payoff CalculatorHow long to debt-free, the payment to hit a date, and the minimum-payment trap.
- Customer Lifetime Value CalculatorDiscounted LTV on a profit basis, plus your LTV to CAC ratio.
- Debt Consolidation CalculatorYour debts vs one consolidation loan: payment, payoff time, true cost.
- Debt Snowball CalculatorSnowball vs avalanche side by side: dates, interest, and payoff order.
- Debt-to-Income Ratio CalculatorYour DTI vs the 36% and 43% lender benchmarks, plus how far you are from each.
- Dimensional Weight CalculatorBillable vs. actual weight with current UPS, FedEx, USPS, and DHL divisors.
- Downsizing CalculatorSell and downsize or stay? Freed equity, monthly savings, payback year.
- Email Signup Value CalculatorWhat one newsletter signup is worth, ready to paste into Google Ads.
- Estate Tax CalculatorYour estate against the $15M line, and what the portability form is worth.
- FBA CalculatorNet profit, margin, and ROI per unit after Amazon's fee stack.
- Gold CalculatorMelt value by weight and karat, plus what buyers actually pay.
- Home Insurance EstimatorDwelling-coverage range from square footage: rebuild cost, not a premium quote.
- Hourly to Salary CalculatorHourly to salary and back, with your real hours and weeks.
- I Bond CalculatorThe composite rate built step by step, growth, penalty, and the tax race.
- Income Tax Calculator2026 federal tax, refund estimate, and a bracket-by-bracket breakdown.
- Inflation CalculatorWhat your money will be worth (or cost) after inflation.
- Inherited IRA RMD CalculatorThis year's RMD, your 10-year deadline, and the year-10 tax bomb.
- Life Insurance CalculatorHow much term life coverage you need, via the DIME method.
- LLM API Cost CalculatorPrice your monthly GPT, Claude & Gemini API bill by tokens and request volume.
- Loan CalculatorMonthly payment, total interest, and a year-by-year payoff schedule.
- Loan Payoff CalculatorExtra payments on any loan: months sooner to payoff and interest saved.
- Long-Term Care Cost CalculatorWhat care really costs: 2025 medians, projected to when you might need them.
- Medicare IRMAA CalculatorYour 2026 Part B and D surcharges, and what the nearest cliff costs.
- Money Goal CalculatorWhat $1,000,000 actually takes per day, per week, and per working hour.
- Mortgage CalculatorMonthly payment with taxes, insurance, and HOA, plus lifetime interest.
- Mortgage Payoff CalculatorSee how extra or biweekly payments move up your payoff date and slash interest.
- Moving Cost EstimatorHonest cost ranges for DIY, hybrid, or full-service moves, local or long-distance.
- Nonprofit Email Signup Value CalculatorWhat a newsletter signup is worth to a nonprofit, in donor lifetime value.
- Pension Lump Sum CalculatorCan the lump sum replicate your pension? Depletion curve and hurdle rate.
- Property Tax CalculatorAnnual and monthly property tax from assessed value and rate.
- Quarterly Tax CalculatorIRS estimated payments for freelancers: SE tax, safe harbor, and due dates.
- Rent vs Buy CalculatorBoth paths priced to the dollar: net costs, break-even year, and a coin-flip call.
- Retirement Withdrawal CalculatorFind out how long your retirement savings will really last.
- Reverse Mortgage CalculatorRough HECM reverse mortgage proceeds from age, home value, and rate.
- RMD CalculatorThis year's required IRA or 401(k) withdrawal, from the current IRS table.
- Roofing Cost CalculatorInstalled-cost range for a new roof by material, pitch, and tear-off.
- Roth Conversion CalculatorPay the tax now or later? Both paths after tax, side by side.
- Roth IRA CalculatorProject tax-free growth and see what the Roth advantage is worth.
- S&P 500 Investment CalculatorSee what a past S&P 500 investment would be worth today.
- Sales Tax CalculatorAdd tax to a price, or strip it back out of a total.
- Shift CalculatorHow long is your shift and what does it pay, differential and all.
- Social Security Break-Even CalculatorClaim at 62, 67, or 70? Break-even ages and lifetime totals, charted.
- Social Security COLA CalculatorYour 2.8% raise, and the net check after Medicare takes its share.
- Square Footage CalculatorAdd up to three shapes, get total area and project cost.
- Student Loan Refinance CalculatorCompare your student loan to a refinance offer, payment and lifetime cost.
- Superannuation CalculatorProject a super balance: 12% of salary, compounding for decades.
- Take-Home Pay CalculatorYour 2026 net paycheck with federal tax, FICA, and 401(k) itemized.
- Time Card CalculatorWeekly hours from your punches: breaks, overtime, and gross pay.
- Tip CalculatorTip, total, and the per-person split, settled before the check gets awkward.
- TVM CalculatorSolve any of the four TVM variables: FV, PV, payment, or years.
- VA Disability CalculatorReal VA math: combine your ratings, see your official rating and 2026 monthly pay.
- VA Loan CalculatorVA home loan payment with the funding fee financed in, and $0 PMI, ever.
Business & Marketing View all →
- Break-Even CalculatorUnits and revenue to cover the bills, plus your margin of safety.
- Cart Abandonment CalculatorYour rate vs the 70% average, and the honest recoverable revenue.
- CPA CalculatorCost per acquisition against the max CPA your margin can afford.
- Customer Lifetime Value CalculatorDiscounted LTV on a profit basis, plus your LTV to CAC ratio.
- Email Revenue CalculatorRevenue per email, per campaign, per subscriber, and honest email ROI.
- Email Signup Value CalculatorWhat one newsletter signup is worth, ready to paste into Google Ads.
- FBA CalculatorNet profit, margin, and ROI per unit after Amazon's fee stack.
- Invoice CalculatorLine items, discount, tax, and balance due, with the due date from your terms.
- Margin CalculatorGross, operating, and net margin as one ladder, plus target pricing.
- Markup CalculatorPrice from cost, cost from price, and how chained markups compound.
- Markup vs Margin CalculatorSame dollars, two denominators: both percentages side by side.
- Mileage Reimbursement Calculator2026 IRS rates including the July change, split-year math, taxable excess.
- Nonprofit Email Signup Value CalculatorWhat a newsletter signup is worth to a nonprofit, in donor lifetime value.
- ROAS CalculatorROAS plus the break-even ROAS your margin sets, and the real profit.
Health & Fitness View all →
- AFT CalculatorAll five events on the official Army scales, plus exactly what you need to pass.
- BAC CalculatorEstimate blood alcohol content from drinks, weight, and time.
- BMI CalculatorBody mass index with your healthy weight range.
- BMR CalculatorCalories you burn at complete rest, with three formulas compared.
- Calorie CalculatorYour daily calorie target for losing, maintaining, or gaining weight.
- Children's Sleep CalculatorAASM sleep hours by age and the bedtime window that delivers them.
- Due Date CalculatorEstimated due date from LMP, conception, or IVF, plus milestone dates.
- Longevity Planning CalculatorSSA longevity data turned into a planning age: averages, odds, and honesty.
- Macro CalculatorSplit your calories into protein, carb, and fat grams.
- MAP CalculatorMean arterial pressure, worked both ways, with pulse pressure.
- Naegele's Rule CalculatorThe classic +7 days, −3 months, +1 year EDD rule, shown step by step.
- One Rep Max CalculatorEstimate your 1RM from any rep set, with a %1RM chart.
- Ovulation CalculatorYour estimated ovulation date and fertile window from your cycle dates.
- Period CalculatorWhen your next period is due, with a six-cycle forecast and ovulation days.
- Sleep CalculatorBedtimes and alarm times that land between 90-minute sleep cycles.
- TDEE CalculatorYour daily calorie burn, plus cut and bulk targets.
- Weight Loss Rate CalculatorYour pace of weight loss, compared against published guidelines.
DIY & Trades View all →
- Board Foot CalculatorBoard feet and cost from thickness, width, length, and quantity.
- BTU CalculatorRight-size an AC or heater from room size, insulation, sun, and climate.
- Carpet CalculatorCarpet in sq ft and sq yd with waste and cost, or a carpet tile count.
- Concrete CalculatorCubic yards and bag counts for slabs, footings, and columns.
- Mulch CalculatorYards and bags of mulch at your depth, plus bags-vs-bulk cost.
- Paint CalculatorGallons and quarts of paint for any room, doors and windows deducted.
- Pool Volume CalculatorGallons to fill your pool, plus hose fill time and water cost.
- Roofing Cost CalculatorInstalled-cost range for a new roof by material, pitch, and tear-off.
- Soil CalculatorCubic yards, bag counts, and weight for topsoil and garden soil.
- Square Footage CalculatorAdd up to three shapes, get total area and project cost.
- Stair CalculatorRisers, riser height, total run, and stringer length, IRC code-checked.
- Tile CalculatorHow many tiles and boxes to buy, with the right waste factor for your layout.
Cooking & Kitchen View all →
- Butter ConverterSticks, cups, tablespoons, ounces, grams: convert butter any direction, fractions included.
- Cooking Measurement ConverterCups, tablespoons, teaspoons, fl oz, ml, liters: any unit to any other.
- Cups to Grams ConverterCups to grams, by ingredient: flour, sugar, butter, honey and more.
- Oven Temperature ConverterFahrenheit, Celsius, gas mark, and the fan adjustment, all from one number.
- Pan Size ConverterSwap baking pans and know exactly how the batter and bake time change.
- Recipe ScalerResize a recipe to any serving count, with kitchen-friendly fractions.
Unit Conversions View all →
- Bra Size CalculatorYour US, UK, and EU bra size plus sister sizes, minus the judgment.
- CM to Inches ConverterCM to inches with a full chart, formula, and worked steps.
- Cooking Measurement ConverterCups, tablespoons, teaspoons, fl oz, ml, liters: any unit to any other.
- Cups to Grams ConverterCups to grams, by ingredient: flour, sugar, butter, honey and more.
- Gold CalculatorMelt value by weight and karat, plus what buyers actually pay.
- Inches to CM ConverterInches to cm, fractions accepted, with a full chart and formula.
- Inches to Feet ConverterInches to feet, decimal and feet-and-inches, with a full chart.
- KG to Lbs Converterkg to lbs with decimal and lb-oz results, plus a chart to 100 kg.
- Lbs to KG Converterlbs to kg with a full chart to 300 lb, plus a stones note.
- Meters to Feet ConverterMeters to feet with decimal and feet-inches results, plus a chart to 100 m.
- ML to Oz Converterml to oz (US) with a bottle-size chart and a swap toggle.
- MM to Inches ConverterMM to inches: decimal and nearest 16th, with the rounding shown.
- Oven Temperature ConverterFahrenheit, Celsius, gas mark, and the fan adjustment, all from one number.
Time & Date View all →
- Age CalculatorYour exact age in years, months, and days, plus a birthday countdown.
- Date CalculatorDays between two dates, or any date plus or minus N days.
- Road Trip CalculatorGoogle's ETA assumes you never stop. Your crew disagrees. Get the real arrival time.
- Shift CalculatorHow long is your shift and what does it pay, differential and all.
- Sleep CalculatorBedtimes and alarm times that land between 90-minute sleep cycles.
- Time Card CalculatorWeekly hours from your punches: breaks, overtime, and gross pay.
- Time Duration CalculatorExact time between two moments, broken down and totaled in every unit.
- Work Hours CalculatorOne day of work, from punches to payroll decimal, breaks deducted.
Fun & Curiosities View all →
- AI Energy CalculatorWhat your AI chatbot habit costs in energy: an honest, cited low-to-high range.
- Airspeed Velocity of an Unladen SwallowThe real physics behind the Monty Python question. About 24 mph. African or European?
- Delta-V CalculatorRocket equation: delta-v from mass ratio and engine Isp.
- Dice RollerRoll up to 10 dice, d4 through d20, with totals and session history.
- Dog Years CalculatorYour dog's real human age. Spoiler: it's not age times 7.
- Loot Drop CalculatorAny drop rate into odds within N tries, and the cost of certainty.
- Minecraft Server RAM CalculatorVanilla or kitchen-sink modpack: find your server's real RAM number.
- Money Goal CalculatorWhat $1,000,000 actually takes per day, per week, and per working hour.
- MTG Opening Hand CalculatorExact odds of drawing your card: opener, by turn, and mulligans.
- NBA Win Probability CalculatorTurn an NBA spread or moneyline into an honest chance of winning outright.
- NFL Win Probability CalculatorPoint spread in, outright win probability out, with the vig stripped away.
- NHL Win Probability CalculatorMoneylines to fair win odds, or Poisson goals math with overtime handled honestly.
- Odds CalculatorConvert American, decimal, and fractional odds, and see the vig hiding in the price.
- Penalty Shootout SimulatorTake the shootout: aim, dive, and watch live win probability shift.
- Pokémon Damage CalculatorThe real damage formula, floors and all, from min to max roll.
- Random Number GeneratorPick random numbers in any range, with or without repeats.
- Road Trip CalculatorGoogle's ETA assumes you never stop. Your crew disagrees. Get the real arrival time.
- Snow Day CalculatorThe odds school closes tomorrow. For fun, hope, and homework avoidance.
- Soccer Win Probability CalculatorElo-based win-draw-loss odds for any two national teams. Settle the argument.
- WNBA Win Probability CalculatorSpread or moneyline in, win probability out, with the sigma assumption said out loud.