All calculators

333 calculators. Use the search box at the top, or browse by category.

Finance

401(k) calculator401(k) balance at retirement, with the employer match.
Amazon seller fee calculatorAmazon referral fee, payout and profit.
Annuity calculatorWhat regular (and rising) contributions grow to.
Annuity payout calculatorMonthly income from a lump sum, or how long it lasts.
APR calculatorThe true yearly cost of a loan once fees are counted.
Auto loan calculatorMonthly car payment with sales tax, fees and trade-in.
Average return calculatorArithmetic average vs annualized return (CAGR).
Bond calculatorBond price from yield, or yield to maturity from price.
Budget calculatorMonthly budget against the 50/30/20 guideline.
Canadian mortgage calculatorSemi-annual compounding and accelerated biweekly payments.
Cash back or low interest calculatorRebate or promotional rate: which car deal is cheaper.
CD calculatorInterest and maturity value of a certificate of deposit.
College cost calculatorFuture college cost and the monthly savings to cover it.
Commission calculatorCommission from sales, or the sales needed for a target.
Compound interest calculatorSavings growth with compounding and monthly deposits.
Credit card payoff calculatorMonths to pay off a card, or the payment to clear it in time.
Currency converterConvert currencies at the ECB’s daily reference rates.
Debt consolidation calculatorCurrent debts versus one consolidation loan.
Debt payoff calculatorAvalanche or snowball plan for several debts.
Debt-to-income ratio calculatorYour DTI ratio as lenders calculate it.
Depreciation calculatorDepreciation schedules by the three common methods.
Discount calculatorSale price, savings and stacked discounts.
Down payment calculatorDown payment and closing cash needed, and time to save it.
eBay fee calculatoreBay final value fee and payout for most categories.
Estate tax calculatorFederal estate tax with the 2026 exclusion.
Etsy fee calculatorEtsy fees, payout and profit per sale.
FHA loan calculatorFHA payment with upfront and annual mortgage insurance.
Finance calculator (TVM)Solve N, I/Y, PV, PMT or FV like a financial calculator.
Future value calculatorWhat a sum and regular payments grow to.
GDP calculatorGDP from C + I + G + (X − M), per capita and growth.
HELOC calculatorHELOC payments in the draw period and after.
Home equity loan calculatorHow much you can borrow against your home, and the payment.
House affordability calculatorThe home price your income and debts support, by the 28/36 rule.
Income tax calculator2026 federal income tax, brackets, effective and marginal rate.
Inflation calculatorValue of a dollar between any two years, by CPI.
IRA calculatorTraditional IRA growth and its after-tax value.
IRR calculatorInternal rate of return and NPV for any cash flows.
Lease calculatorCar lease payment from residual and money factor.
Loan calculatorMonthly payment, payoff time or interest rate for any fixed-rate loan.
Margin and markup calculatorProfit margin, markup and the price for a target margin.
Marriage tax calculatorMarriage penalty or bonus on federal tax.
Mortgage calculatorMonthly payment with tax, insurance and PMI, plus the amortization schedule.
Mortgage payoff calculatorHow extra or lump-sum payments shorten your mortgage.
Mutual fund calculatorFund growth after expense ratio and sales load.
Payback period calculatorHow long an investment takes to pay for itself.
PayPal fee calculatorPayPal fees, or what to charge to receive an amount.
Pension calculatorIs the lump sum worth more than the monthly pension?
Present value calculatorWhat a future sum or payment stream is worth today.
Refinance calculatorNew payment, savings and break-even for a mortgage refinance.
Rent calculatorAffordable rent from your income, and income needed for a rent.
Rent vs buy calculatorNet cost of renting versus buying over the years you stay.
Rental property calculatorCash flow, cap rate, cash-on-cash return and IRR for a rental.
Retirement calculatorProjected savings, the nest egg you need and the monthly gap.
RMD calculatorRequired minimum distribution from the IRS table.
ROI calculatorReturn on investment, total and per year.
Roth IRA calculatorRoth vs traditional vs taxable, after tax.
Salary calculatorConvert hourly, weekly, monthly and yearly pay.
Sales tax calculatorTax and total at your rate, or the price before tax.
Shopify fee calculatorShopify Payments card fees by plan.
Simple interest calculatorInterest = principal × rate × time.
Social Security calculatorYour benefit at each claiming age and the break-even point.
Square fee calculatorSquare fees by plan and payment type.
Stripe fee calculatorStripe card fees, or what to charge to net an amount.
Student loan calculatorPayments including interest that builds up during school.
Take-home pay calculatorPaycheck after 2026 federal tax, FICA and deductions.
VA mortgage calculatorVA loan payment with the funding fee.
VAT calculatorAdd or remove VAT or GST at any rate.

Business

Break-even calculatorBreak-even units and sales, and units for a profit goal.
Cash runway calculatorMonths of cash at your burn rate.
Churn rate calculatorChurn and retention rates for a period.
Customer lifetime value calculatorCustomer lifetime value and CLV:CAC.
DSCR calculatorDebt service coverage ratio and borrowing capacity.
Employee cost calculatorWages plus payroll taxes and benefits.
Financial ratio calculatorWorking capital, liquidity and leverage ratios.
Freelance hourly rate calculatorHourly rate to reach a take-home goal.
Inventory turnover calculatorTurnover, days of inventory and EOQ.
Late fee and invoice interest calculatorInterest and fees on an overdue invoice.
Profit calculatorGross, operating and net profit and margins.
ROAS and conversion calculatorROAS, conversion rate and cost per sale.
Unit price calculatorWhich package size is the better deal.

Health & fitness

A1C calculatorA1C to estimated average glucose and back.
Alcohol units calculatorStandard drinks and units in a drink.
Baseball stats calculatorAVG, OBP, SLG, OPS, ERA and WHIP.
Blood pressure category calculatorCategory of a blood pressure reading.
BMI calculatorBody mass index, category and healthy weight range.
BMR calculatorCalories burned at rest, by three formulas.
Body fat calculatorBody fat percentage from tape measurements (Navy method).
Caffeine calculatorCaffeine remaining after hours, by half-life.
Calorie calculatorDaily calories (TDEE) to maintain, lose or gain weight.
Calories burned calculatorCalories burned by activity, weight and time.
Conception calculatorLikely conception date from a due date.
Cycling power calculatorW/kg and power zones from FTP.
Due date calculatorDue date, weeks pregnant and trimester dates.
Ideal weight calculatorIdeal weight by four formulas and the healthy BMI range.
Lean body mass calculatorLean body mass by three formulas.
Macro calculatorGrams of protein, carbs and fat for your calories.
One rep max calculatorEstimated 1RM and training percentages.
Ovulation and period calculatorNext periods, ovulation and fertile windows.
Pace calculatorPace from time and distance, or finish time from pace.
Pack-year calculatorSmoking pack-years and screening eligibility.
Pregnancy weight gain calculatorRecommended pregnancy weight gain by pre-pregnancy BMI.
Protein calculatorDaily protein in grams by weight and activity.
Race time predictorPredicted race times from a recent result.
Steps to miles calculatorSteps to miles or km, by stride or height.
Swim pace calculatorSwim pace per 100, or finish time.
Target heart rate calculatorMax heart rate and training zones by age.
VO2 max calculatorVO2 max from a 12-minute run or heart rates.
Waist-to-hip ratio calculatorWaist-to-hip and waist-to-height ratios.
Water intake calculatorDaily fluid needs with exercise and heat.

Math & statistics

Angle converterDegrees, DMS, radians, gradians and turns.
Area calculatorArea of nine common shapes in any unit.
Big number calculatorExact arithmetic on integers of any size.
Binary calculatorBinary arithmetic, bitwise operations and conversion.
Circle calculatorArea, circumference, diameter and radius from any one.
Confidence interval calculatorConfidence intervals for a mean or a proportion.
Decimal, fraction and percent converterDecimal ↔ fraction ↔ percent.
Distance calculatorDistance between points, or between two map coordinates.
Exponent calculatorPowers, including negative and fractional, or solve for the exponent.
Factor calculatorAll factors, factor pairs and prime factorization.
Fraction calculatorFractions and mixed numbers, simplified, with steps.
GCF calculatorGreatest common factor and all common factors.
Golden ratio calculatorGolden-ratio proportions for any length.
Half-life calculatorExponential decay: amount left, half-life or time.
Hex calculatorHexadecimal arithmetic, bitwise operations and conversion.
LCM calculatorLeast common multiple of a list of numbers.
Linear interpolation calculatorInterpolate between two known points.
Log calculatorLogarithms to any base, ln and log10.
Long division calculatorLong division with every step written out.
Matrix calculatorMatrix arithmetic, determinant, inverse and transpose.
Mean, median, mode calculatorAverage, median, mode and range of a list.
Modulo calculatora mod n and integer division, sign conventions explained.
Number base converterConvert numbers between bases 2 to 36.
Number sequence calculatornth term and sum of arithmetic, geometric and Fibonacci sequences.
P-value calculatorp-values from z, t, chi-square and F statistics.
Percent error calculatorError of a measurement as a percentage.
Percentage calculatorPercent of, what percent, percent change.
Permutation and combination calculatornPr and nCr, with or without repetition.
Prime number calculatorPrime check, next prime and primes in a range.
Probability calculatorTwo-event, repeated-trial and binomial probabilities.
Quadratic formula calculatorRoots of ax² + bx + c = 0, real or complex, with steps.
Random number generatorRandom numbers in a range, with or without repeats.
Ratio calculatorSimplify ratios and solve proportions.
Right triangle calculatorPythagorean theorem: missing side, angles and area.
Root calculatorSquare, cube and nth roots, with simplified radicals.
Rounding calculatorRound to places, significant figures or the nearest 10.
Sample size calculatorSurvey sample size for a margin of error.
Scientific calculatorType any expression: trig, logs, powers, roots, factorials.
Scientific notation calculatorConvert to scientific and engineering notation.
Significant figures counterHow many significant figures a number has.
Slope calculatorSlope, angle and equation of the line through two points.
Standard deviation calculatorStandard deviation and variance with the working shown.
Surface area calculatorTotal surface area of eight solids.
System of equations solverSolve 2×2 and 3×3 linear systems.
Triangle calculatorAll sides, angles and area from three known parts.
Trigonometry calculatorAll six trig functions of an angle.
Vector calculatorDot and cross products, magnitudes and angle.
Volume calculatorVolume of eight solids, convertible to gallons or liters.
Z-score calculatorz-score, percentile and normal probabilities.

Home & DIY

Air conditioner size calculatorBTU rating for a window or portable AC, from the ENERGY STAR chart.
Asphalt calculatorTons of asphalt for a driveway.
Baluster spacing calculatorBaluster count and even gap under 4 in.
Baseboard and trim calculatorLinear feet and pieces of baseboard, crown or chair rail.
Battery runtime calculatorHours a battery or power station runs a load.
Board foot calculatorBoard feet and cost for hardwood and rough lumber.
Brick and block calculatorBricks or concrete blocks for a wall, with mortar bags.
Carpet calculatorSquare yards of carpet and pad, by roll width.
Caulk calculatorCaulk tubes for a joint length and size.
Concrete calculatorCubic yards and 40, 60 or 80 lb bags for slabs, footings and round columns.
Concrete steps calculatorConcrete volume for poured steps.
Crown molding angle calculatorMiter and bevel angles for crown in any corner.
Deck board calculatorDeck boards, linear feet and screws from the deck size and joist spacing.
Deck stain calculatorStain for the deck surface, railings and steps.
Diagonal calculatorDiagonal of a rectangle to check for square.
Drywall calculatorSheets of 4 × 8, 4 × 10 or 4 × 12 drywall for walls and ceiling.
Drywall mud and tape calculatorJoint compound, tape and screws for a drywall job.
Duct size calculatorDuct diameter or rectangle for a CFM and velocity.
Epoxy floor coating calculatorEpoxy kits for a garage or basement floor.
Even spacing calculatorPositions to space any number of items evenly.
Fence calculatorPosts, rails, pickets and post concrete for a wood fence.
Flooring calculatorBoxes of laminate, vinyl plank or hardwood for a room, with waste.
Generator size calculatorGenerator watts from your appliance list.
Gravel calculatorCubic yards and tons of gravel, crushed stone or sand for any area and depth.
Grout calculatorGrout volume and weight from tile size and joint width.
Gutter calculatorGutters, downspouts and hangers for a roof edge.
Heating BTU calculatorRough heating BTU for a space by climate.
Insulation calculatorBags of batts or blown-in insulation for an area.
Paint calculatorGallons and quarts for a room’s walls and ceiling, by coats and coverage.
Paver calculatorPavers, base gravel and bedding sand for a patio or path.
Rafter length calculatorRafter length, cut angles and ridge height.
Rebar calculatorBars, laps, linear feet and weight for a slab rebar grid.
Retaining wall calculatorBlocks, caps, base and drainage stone for a block wall.
Roofing calculatorRoof area, squares and shingle bundles from the footprint and pitch.
Siding calculatorSiding squares and pieces for walls and gables.
Solar panel calculatorSystem size and panels to match your power use.
Spray foam calculatorBoard feet, R-value and kits of spray foam.
Square footage calculatorSquare feet for rooms, L-shapes, circles and triangles, with cost.
Stair calculatorRisers, treads, run and stringer length from the total rise.
Tank volume calculatorTank volume, including partly filled horizontal tanks.
Thinset calculatorBags of thinset mortar by trowel notch.
Tile calculatorTiles and boxes for a floor or wall, counting grout joints and cuts.
Wall stud calculatorStuds and plates for framing a wall.
Wallpaper calculatorRolls of wallpaper by strips, with pattern repeat.
Wheelchair ramp calculatorRamp length and landings for a rise.

Garden & homestead

Chicken feed calculatorFeed, bags and cost for a backyard flock.
Daily light integral calculatorDLI from PPFD and hours, or hours for a target DLI.
Fertilizer calculatorPounds of fertilizer for a target nitrogen rate.
Firewood calculatorCords and face cords in a woodpile.
Grass seed calculatorPounds and bags of grass seed at the rate on the bag.
Hay calculatorBales of hay for a winter or season.
Log board feet calculatorLumber in a log by the three common log rules.
Mulch calculatorCubic yards or 2 and 3 cu ft bags of mulch for any bed shape and depth.
Plant spacing calculatorHow many plants fit a bed, in square or staggered rows.
Pond calculatorPond volume and liner size.
Rainwater harvesting calculatorRainwater collected from a roof and barrels needed.
Raised bed soil calculatorSoil to fill raised beds, in bags or yards, with settling and mix recipes.
Seed starting date calculatorSeed-starting and planting dates from your last frost.
Seeds needed calculatorSeeds to sow for a number of plants or rows.
Sod calculatorSquare feet, pieces and pallets of sod for a lawn.
Sprinkler run time calculatorSprinkler minutes from the water your lawn needs.
Tree height calculatorTree height from distance and angle to the top.

Cooking & baking

ABV calculatorAlcohol by volume from hydrometer readings.
Baker’s percentage calculatorDough ingredient weights from baker’s percentages.
Brine calculatorSalt and sugar for brines and ferments.
Coffee ratio calculatorCoffee and water for any brew ratio.
Cups to grams converterCups to grams for flour, sugar, butter and more.
Oven temperature converterOven °F, °C, fan and gas mark.
Pan size converterScale a recipe for a different pan size.
Pizza dough calculatorIngredients for any number of pizza dough balls.
Recipe scalerScale a whole recipe to any number of servings.
Sourdough hydration calculatorTrue sourdough hydration including the starter.
Yeast converterActive dry, instant and fresh yeast equivalents.

Everyday

Age calculatorExact age in years, months and days.
Bandwidth calculatorDownload time from file size and speed, or the reverse.
Base64 encoder and decoderEncode or decode Base64, privately in your browser.
Date calculatorDays between dates, or a date plus or minus a span.
Day of the week calculatorThe weekday of any date.
Dice rollerRoll any dice, with a modifier.
Dog age calculatorDog years to human years, the modern way.
Driving carbon footprint calculatorCO₂ from driving a gasoline or diesel car.
EV charging calculatorEV charging time and cost.
EV vs gas cost calculatorElectric versus gasoline fuel cost per year.
Fuel cost calculatorGas cost of a trip, split between riders.
Gas mileage calculatorYour real MPG and L/100 km from a fill-up.
GPA calculatorSemester and cumulative GPA from grades and credits.
Grade calculatorWeighted grade, or the final exam score you need.
Height calculatorPredicted adult height from the parents’ heights.
Hours calculatorHours between two times, overnight included.
IP subnet calculatorIPv4 network, broadcast, hosts and masks from CIDR.
Password generatorStrong random passwords, generated privately.
Reading and speaking time calculatorReading and speaking time for a word count.
Roman numeral converterNumbers to Roman numerals and back.
Screen size calculatorScreen width, height and pixel density.
Sleep calculatorBedtimes or wake times that fit sleep cycles.
Time calculatorAdd or subtract hours, minutes and seconds.
Time card calculatorWeekly hours, overtime and pay from a time card.
Time zone calculatorConvert a time between cities, with daylight saving.
Tip calculatorTip, total and each person’s share.
Tire size calculatorCompare two tire sizes and the speedometer change.
TV viewing distance calculatorSeating distance for a TV, or TV size for a room.
Typing speed calculatorTyping WPM and accuracy.
Unit conversion calculatorConvert length, weight, volume, temperature and more.
URL encoder and decoderPercent-encode or decode URLs and query values.

Science & engineering

Buoyancy calculatorBuoyant force and float or sink.
Centripetal force calculatorCentripetal force and acceleration.
Coulomb’s law calculatorForce between two electric charges.
Density calculatorDensity, mass or volume from the other two.
Dew point calculatorDew point from temperature and humidity, or the reverse.
Dilution calculatorHow much stock and water for a dilution.
Electricity cost calculatorRunning cost of an appliance per day, month and year.
Force calculator (F = ma)Newton’s second law, solved any way.
Free fall calculatorFall time and impact speed.
Heat index calculatorFeels-like temperature in humidity, and risk level.
Horsepower calculatorHorsepower from torque and RPM, or from drag-strip times.
Ideal gas law calculatorSolve PV = nRT.
Kinetic energy calculatorKinetic energy from mass and speed.
Molarity calculatorMolarity, or the mass to weigh out for a solution.
Molecular weight calculatorMolar mass and composition from a formula.
Momentum and impulse calculatorMomentum, impulse and average force.
Ohm’s law calculatorVolts, amps, ohms and watts from any two.
Pendulum calculatorPendulum period from length, or the reverse.
pH calculatorpH ↔ pOH ↔ ion concentrations.
Potential energy calculatorGravitational potential energy mgh.
Projectile motion calculatorRange, peak height and flight time.
Resistor color code calculatorResistance and tolerance from color bands.
Snell’s law calculatorRefraction angle and critical angle.
Speed calculatorSpeed, distance or time from the other two.
Speed of sound calculatorSpeed of sound by temperature, and lightning distance.
Spring force calculatorSpring force, stretch and stored energy.
Thin lens calculatorImage distance and magnification of a lens.
Voltage drop calculatorVoltage drop and percent for a wire run.
Wavelength, frequency and photon energy calculatorWavelength ↔ frequency ↔ photon energy.
Weight calculatorMass to weight in newtons, on Earth and other worlds.
Wind chill calculatorFeels-like temperature in wind, and frostbite risk.
Work and power calculatorWork done and power.

Crafts

Bead calculatorBeads needed for a strand length.
Candle wax calculatorWax and fragrance oil for candle containers.
Cross-stitch fabric calculatorFinished size and fabric to cut for cross-stitch.
Epoxy resin calculatorResin and hardener for a mold or pour.
Fabric yardage calculatorYardage for a list of rectangular pieces.
Increase and decrease evenly calculatorInstructions to increase or decrease evenly.
Knitting gauge calculatorStitches to cast on and rows to knit from your swatch gauge.
Quilt backing calculatorBacking yardage and seam layout for any quilt size.
Quilt binding calculatorBinding strips and yardage from the quilt size.
Quilt cutting calculatorStrips and yardage for squares, rectangles and HSTs.
Quilt size calculatorFinished quilt size from blocks, sashing and borders.
Soap lye calculatorLye and water for cold-process soap.
Yarn calculatorYarn for a project, scaled from your swatch.

Hobbies & tech

3D print cost calculatorFull cost and price of a 3D print.
3D printing filament calculatorFilament grams ↔ meters and the cost of a print.
555 timer calculatorFrequency and duty cycle of a 555 astable.
Antenna length calculatorDipole and quarter-wave antenna lengths.
Aquarium dosing calculatorScale a product dose to your tank.
Aquarium volume calculatorGallons, liters and water weight of a fish tank.
Belt length calculatorBelt length and speed ratio for two pulleys.
Bike gear calculatorGear inches and speed for a chainring and cog.
BPM to milliseconds calculatorNote lengths in ms for a tempo.
Cutting speed calculatorSpindle RPM from tool diameter and surface speed.
Decibel calculatordB ↔ ratios and dBm ↔ watts.
Depth of field calculatorDepth of field and hyperfocal distance.
Exposure value calculatorExposure value and equivalent settings.
Field of view calculatorAngle of view, coverage and crop-factor equivalent.
Gear ratio calculatorGear ratio, output speed and torque.
Golf handicap calculatorHandicap Index from your last 20 rounds (WHS).
LED resistor calculatorSeries resistor value and wattage for LEDs.
ND filter calculatorLong-exposure shutter speed with an ND filter.
Note frequency calculatorFrequency of any note in equal temperament.
Print size calculatorPrint size from pixels and DPI, and the reverse.
RC time constant calculatorRC time constant, charge times and cutoff frequency.
Series and parallel resistor calculatorTotal of resistors in series or parallel.
SWR calculatorSWR and losses from forward and reflected power.
Telescope magnification calculatorTelescope magnification, field and exit pupil.
Time-lapse calculatorTime-lapse interval, photos and clip length.
Voltage divider calculatorVoltage divider output, or resistor for a target.