Calculator Directory

Convert your A1C percentage to estimated average blood sugar.

Find the absolute value (distance from zero) of any number.

Convert acres to square feet for real estate, landscaping, and property comparisons.

Find the date after adding a number of days.

Calculate your exact age in years, months, and days with zodiac sign and next birthday countdown.

Estimate LLM API cost from token counts and your provider’s price per million tokens.

Calculate alcohol units from drinks consumed.

See how extra monthly payments change a fixed-rate loan payoff schedule and total interest.

Convert a nominal APR into the effective annual yield for any compounding frequency.

Convert National Senior Certificate percentages into admission points and check the statutory pass level.

Work out tank volume in litres and gallons, allowing for substrate and decoration displacement.

Convert square meters, square feet, acres, and more.

Scale a width or height to a given aspect ratio and see the resulting dimensions and megapixels.

Convert basis points into a percentage rate change and the dollar impact on a balance.

Convert a value between binary, octal, decimal, and hexadecimal in one step.

Classify your blood pressure reading against ACC/AHA 2017 guidelines.

Compute Body Mass Index with Metric & Imperial units and target healthy weight guides.

Estimate daily calorie needs using age, height, weight, and sex.

Estimate body fat percentage with the U.S. Navy tape method.

Classify your body frame as small, medium, or large.

Estimate body surface area using the Mosteller formula.

Classify your body type as ectomorph, mesomorph, or endomorph.

Find the boiling point of water at your altitude.

Find the unit sales and revenue needed to cover fixed and variable costs.

Calculate salt and water weights for a target salinity percentage, with grams per litre shown.

Estimate a room cooling load in BTU per hour and translate it into tons and a common air-conditioner size.

Divide your income into needs, wants, and savings using the 50/30/20 rule.

Convert butter between sticks, cups, tablespoons, teaspoons, grams, and ounces.

Find your daily caffeine limit based on weight.

Calculate the Compound Annual Growth Rate of any investment.

Compare pan volumes and areas to scale a cake recipe between different pan sizes and depths.

Calculate how long to reach goal weight at a given daily deficit.

Estimate calories burned during exercise using MET values.

Turn net operating income and property price into a cap rate, plus the value implied by a target cap.

Calculate a capital gain, the taxable portion, tax due, and net proceeds after tax.

Project a vehicle’s value year by year using a declining-balance rate and a salvage floor.

Estimate a vehicle-loan installment from the price, down payment, trade-in equity, APR, and term.

Set daily carbohydrate targets by body weight and activity.

Measure the annual pre-tax cash flow against the actual cash invested in a rental property.

Convert Celsius to Fahrenheit for cooking, weather, and science.

Calculate circle area and circumference from radius or diameter.

Estimate the fees and prepaids you pay when buying or refinancing a home.

Convert centimeters to inches for height, fabric, and product dimensions.

Calculate coffee-to-water ratio for brewing.

Calculate C(n,r) and P(n,r) for any n and r.

Calculate total sales commission and split payouts between brokers, agents, or team members.

Project fixed-rate compound growth with monthly contributions, including SIP-style scenarios.

Work backwards from a due date or last period to the most likely conception date and intercourse window.

Estimate concrete in cubic yards and number of bags needed.

Find the confidence interval for a sample mean, with margin of error, standard error, and critical value.

Check any text and background colour pair against WCAG AA and AAA contrast thresholds.

Calculate conversion rate, cost per conversion, revenue per visitor, and the range the true rate could sit in.

See how much monthly interest your card balance accrues.

Find out how long it takes to pay off credit card debt and how much interest you pay.

Calculate utilization from balances and limits, plus the balance to reach 30 percent or 10 percent.

Turn a min and max font size across two viewport widths into a fluid clamp() slope and intercept.

Convert cup measurements to grams using ingredient density.

Convert cups to milliliters for international recipes and precise liquid measures.

Convert between 40+ world currencies with live exchange rates.

Calculate customer acquisition cost from marketing and sales spend, then see the payback period.

Estimate customer lifetime value from order value, margin, purchase frequency, lifespan, and CAC.

Calculate the true cost of your daily commute.

Convert between bits, bytes, KB, MB, GB, and TB.

Find the exact number of days, weeks, months, and business days between any two dates.

Convert days to hours for project deadlines and travel planning.

Convert a day count into weeks and months instantly.

Count down to any future event. See how many days, weeks, and months remain until your target date.

Compare consolidation options and see how much you could save.

Compare debt snowball and debt avalanche strategies to map your debt-free timeline.

Calculate your DTI ratio for mortgage qualification.

Convert hours and minutes into decimal hours instantly.

Estimate decking boards, linear feet, joists, and screws from deck size and board dimensions.

Calculate material density from mass in kilograms and volume in liters, with SI conversions.

Work out how much stock solution and diluent you need to reach a target concentration and volume.

Calculate billable parcel weight from carton dimensions, carrier divisor, and actual weight.

Compute discounted prices, stacking promo codes, and final checkout totals.

Find the distance between two points in 2D or 3D.

Calculate current yield, yield on cost, and annual dividend income from your share count.

Convert dog years to human years with the modern DNA formula.

Break your down payment goal into a daily, weekly, and monthly savings pace.

Estimate how long a file takes to download from its size and your connection speed.

Estimate drywall sheets, joint compound, tape, and screws from wall area and sheet size.

Estimate your due date from your last period or conception date, with gestational age and trimester.

Estimate appliance running costs from wattage and usage.

Size the savings cushion you need to cover living costs.

Convert coating area and thickness into resin volume, gallons, litres, and part A and B amounts.

Compare the cost of a home charge and a public charge after losses, with range added and cost per mile or kilometre.

Compute powers and roots of any number.

Model growth or decay over time.

Calculate n! for any positive integer.

Convert Fahrenheit to Celsius for travel, international recipes, and science.

Estimate how much dietary fat you need each day.

Convert feet to meters for height, construction, and running distances.

Estimate posts, sections, rails, pickets, and concrete bags for a run of fence.

Work out how much fertilizer to spread for a target nitrogen rate, based on the bag analysis.

Find out what score you need on the final exam to achieve your target grade.

Convert a stacked woodpile into cubic feet, cords, face cords, and cubic metres.

Estimate flooring needed including cutting waste.

Convert flour between cups and grams, with a different density for each type of flour.

Add, subtract, multiply, or divide fractions and simplify the result.

Convert a fraction to a decimal and percentage, and simplify it to lowest terms.

Convert any fraction to a percentage and decimal in one step.

Turn a target income, tax set-aside, expenses, and realistic billable hours into an hourly and day rate.

Estimate trip fuel cost from distance, mileage, and price.

Convert gallons to liters for fuel, recipes, and pool maintenance.

Calculate vehicle fuel economy and convert between US MPG, Imperial MPG, and L/100 km.

Convert gigabytes to terabytes for hard drive and cloud storage.

Find the greatest common divisor and least common multiple.

Add up running and starting watts, apply headroom, and see the generator size and kVA to look for.

Estimate purity-adjusted gold value and a scenario loan amount from an entered LTV.

Turn scores into differentials and build a Handicap Index with the World Handicap System table.

Compute grade point average from total points and credit hours.

Convert grams to ounces for US recipes and product weight references.

Plot and compare explicit functions with an interactive coordinate plane.

Calculate gravel volume in cubic yards, weight in tons, and the number of bags needed.

Estimate gutter length, hanger count, downspout pipe, and 10 ft sections from the roof edge run.

Project how much of a substance remains after a given time, and how many half-lives have passed.

Convert a hex colour to RGB and HSL with a live preview.

Calculate your current home equity, loan-to-value ratio, and HELOC capacity.

Convert hourly pay to weekly, monthly, and annual income.

Convert hours to minutes for time tracking, scheduling, and project billing.

Calculate hours between now and a future time.

Add purchase, rehab, and holding costs, subtract selling costs from the resale value, and see profit and ROI.

Find the ideal body fat range for your age and sex.

Find pressure from moles, temperature, and volume, with density and molar volume included.

Estimate a healthy target weight using the Devine formula.

Convert inches to centimeters for height, screen sizes, and crafts.

Estimate income tax, after-tax income, and a balance due or refund from taxable income and your effective rate.

Calculate real investment returns after accounting for inflation.

See what an amount will cost in the future and what today’s money will be worth after inflation.

Convert cups and spoons into grams using measured densities for common baking ingredients.

Find the extra R-value, installed thickness, package count, and material cost for a wall or ceiling.

Calculate return on investment for stocks, real estate, or any purchase.

Work out the network address, broadcast, usable host range, mask, and wildcard from an IPv4 address and prefix.

Find the internal rate of return of a cash-flow series and compare it with your hurdle rate.

Estimate water use per watering session, week, and month from area, application rate, and run time.

Convert kilograms to pounds for travel, fitness, and everyday weight.

Convert kilometers to miles for road trips, running, and fitness tracking.

Estimate mulch, gravel, or topsoil required in cubic yards and standard bags from area and depth.

Estimate LDL cholesterol with the Friedewald equation and see non-HDL and cholesterol ratios.

Estimate your lean body mass excluding fat using the Boer formula.

Convert meters, feet, miles, and more length units instantly.

Convert liters to gallons for fuel purchases and US recipe conversions.

Estimate daily and annual feed weight and cost from herd size, body weight, and intake percent.

Find out how much you can afford to borrow based on your income.

Estimate an EMI or monthly installment and total interest for a fixed-rate loan.

Compute board feet for any lumber quantity and size.

Split daily calories into protein, carbs, and fat targets.

Find the exact calories needed to stay at your current weight.

Calculate the margin of error and confidence interval for a survey proportion at any confidence level.

Convert markup percentages to margin and set profitable selling prices.

Convert megabytes to gigabytes for file storage and data planning.

Work out the cost of each serving from a total recipe price.

Calculate mean arterial pressure and pulse pressure from systolic and diastolic readings.

Find the mean, median, and mode of any dataset with range, sum, and count.

Compare your BMR to population averages for your age group.

Convert meters to feet for real estate, sports, and construction.

Convert miles to kilometers for driving, running, and travel.

Convert minutes to hours and minutes.

Find the remainder after division.

Convert solute mass, molar mass, and solution volume into molarity and millimolarity.

Parse a chemical formula into molar mass, atom count, and percentage composition by mass.

Convert months to days for pregnancy, subscriptions, and deadlines.

Find the maximum home price your income and debts support.

Estimate a home loan EMI or mortgage payment, total interest, taxes, insurance, and amortization.

Estimate a move from distance, labour, packing, and supplies, with a cost per kilometre.

Convert miles per hour to kilometers per hour for driving and travel.

Calculate mulch in cubic yards, cubic feet, bags, and approximate weight.

Calculate your total net worth by adding assets and subtracting liabilities.

Find the probability between two values, z-scores, and the middle 68% and 95% ranges of a normal distribution.

Discount a series of cash flows to present value and see whether a project creates value.

Enter any two of voltage, current, resistance, or power and solve the other two.

Estimate your one-rep max from a lighter lifting set.

Convert ounces to grams for baking, nutrition labels, and precious metals.

Convert oven settings between Celsius, Fahrenheit, gas mark, and fan-assisted equivalents.

Calculate regular pay, overtime pay at your multiplier, total gross pay, and the blended hourly rate.

Predict ovulation, your six-day fertile window, and the next three cycles from your last period.

Convert fluid ounces to cups and other volume units instantly.

Convert cigarettes per day and years smoked into pack-years and total cigarettes.

Estimate gallons of paint needed for walls and ceilings.

Estimate the total cost of parking for a trip.

Estimate password entropy in bits and how long an offline attacker would need to crack it.

Estimate pavers from patio area, paver size, joint width, and a cutting waste allowance.

Find how long an investment takes to repay its initial cost from annual cash flow.

Find percentage of a value, percentage increase/decrease, and ratios instantly.

Find the value at any percentile, or the percentile rank of a specific value, from a data set.

Estimate net cash after an origination fee, monthly installments, and total borrowing cost.

Estimate resting and daily calorie needs for a dog or cat from weight and life stage.

Estimate monthly pet food costs.

Convert between pH, pOH, hydrogen-ion, and hydroxide-ion concentration with an acidity label.

Convert pints to quarts for US liquid volume measurements.

Calculate display PPI, dot pitch, and megapixels from resolution and diagonal size.

Work out flour, water, salt, and yeast for any number of dough balls at a chosen hydration.

Estimate pond volume in cubic metres, litres, and gallons, with a shape factor for irregular ponds.

Calculate concrete volume per post hole after subtracting the post, plus bags at your yield.

Convert pounds to kilograms for fitness tracking, cooking, and shipping.

Convert pounds to stone for UK weight references and comparisons.

See how many weeks and days pregnant you are, the trimester, fetal age, and your next antenatal milestone.

Determine what future money is worth in todays dollars.

Compare package sizes by normalized price per weight, volume, or item.

Determine if a number is prime and find factors.

Convert favourable and total outcomes into a probability, decimal, and odds.

Calculate flight time, range, maximum height, and launch components from speed, angle, and height.

Estimate annual and monthly property tax from market value, assessment ratio, and mill rate.

Set daily protein targets by body weight and goal.

Convert PSI to bar for tire pressure, air compressors, and hydraulics.

Find any side of a right triangle given two sides.

Solve any ax^2 + bx + c = 0 equation.

Estimate an equivalent race time at another distance from one known result.

Estimate annual rain capture from a roof footprint using rainfall and a runoff coefficient.

Solve proportions like a:b = c:d and scale values by a ratio.

Estimate rebar linear feet, stock bars, and weight for a slab grid at your spacing and bar size.

Scale any recipe ingredient to your desired serving count.

Find your break-even point and monthly savings when refinancing a mortgage.

Convert rem to pixels and pixels to rem at any root font size, with the root percentage shown.

Compare total renting cost against buying, including the equity you build.

Calculate gross and net rental yield, monthly cash flow, and net operating income for investment property.

Decode a four-band resistor from its colours into resistance and tolerance range.

Estimate if your current savings will be enough for retirement.

Calculate return on ad spend, the profit left after ads, and the break-even ROAS for your margin.

Measure return on investment and net profit from a final value.

Convert roof rise and run into pitch, angle in degrees, percentage grade, and slope multiplier.

Calculate roof surface area, roofing squares, and bundle counts from ground footprint and pitch.

Compute floor area in square feet and square meters.

Compute room volume in cubic feet and cubic yards.

Round numbers to any decimal place or whole number.

Estimate calories burned during a run by pace and duration.

Convert distance and time into pace per mile or kilometer.

See what a raise is worth before and after inflation, with the monthly difference.

Convert your annual salary to an hourly, daily, weekly, or monthly rate.

Calculate the survey or study sample size needed for a target confidence level and margin of error.

Find out how much to save monthly to reach your financial goal.

Full scientific calculator with trigonometry, logarithms, exponents, factorials, and keyboard support.

Calculate what your screen time costs in electricity.

Convert seconds into hours, minutes, and seconds.

Estimate severance weeks and gross pay from weekly pay, service years, policy weeks, and a minimum.

Estimate siding pieces, squares, and boxes from exterior wall area, coverage, and waste.

Calculate interest earned or owed without compounding.

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Track cumulative sleep deficit and recovery needs.

Calculate total sleep from bedtime to wake time.

Find the slope and equation of a line through two points.

Estimate sod rolls and pallets from lawn area with a waste allowance and your supplier roll coverage.

Size a solar array from annual electricity use, peak sun hours, panel wattage, and system losses.

Calculate the volume of a cube, prism, sphere, cylinder, or cone.

Calculate trip fuel costs with official October 2026 SA petrol and diesel prices by province.

Calculate the energy needed to heat or cool a mass by a temperature change using specific heat.

Convert between km/h, mph, knots, and meters per second.

Solve for journey time, average speed, or distance, with the result shown as clock time and pace.

Convert square feet to acres for property listings and land comparisons.

Calculate risers, treads, total run, and stringer length from total rise and target riser height.

Calculate mean, median, sample and population standard deviation, variance, and more from a list of numbers.

Convert step count to distance in miles and kilometers, and estimate calories burned walking.

Convert stone to pounds for UK body weight measurements.

Add up all your monthly subscriptions.

Convert a swim time and distance into pace per 100 m, speed, and split times.

Convert tablespoons to teaspoons for accurate cooking and medication dosing.

Turn a gross salary into monthly and annual take-home pay after tax, retirement, and deductions.

Find your cardio training zones by age and resting heart rate.

Calculate your Total Daily Energy Expenditure and find the right calorie target for weight loss or muscle gain.

Convert between Celsius, Fahrenheit, and Kelvin instantly.

Convert correct answers into a test percentage instantly.

Estimate tile quantities and full boxes needed based on room dimensions, tile size, and waste.

Add hours and minutes together.

Total weekly shift hours, overtime, unpaid breaks, and estimated gross pay.

Convert a time between major world time zones.

Calculate exact tip percentages and split evenly per diner with one click.

Compare two tire sizes by diameter, circumference, and the resulting speedometer error.

Estimate topsoil in cubic yards, tons, and bags for lawns, beds, and raised areas.

Solve SSS, SAS, ASA, and AAS triangles with the law of sines and cosines, including area and perimeter.

Budget fuel, tolls, parking, lodging, and food for a whole trip, then split the total per person.

Convert Unix epoch seconds or milliseconds to UTC ISO 8601 strings and local browser dates.

Percent-encode text for a URL query or decode an encoded URL back into readable text.

Calculate sample and population variance, standard deviation, mean, and range from a list of values.

Add VAT to a net price or remove VAT from a gross price at any rate, with the tax split shown.

Estimate video file size from duration, video bitrate, and audio bitrate in MB, GB, and GiB.

Estimate your VO2 max from a recent run time.

Calculate the volts lost in a two-wire run and the voltage that actually reaches the load.

Convert liters, gallons, cups, and cubic units instantly.

Determine if your waist is too large for your height.

Assess body fat distribution and health risk using waist and hip measurements.

Estimate wallpaper rolls from wall size, roll dimensions, and pattern repeat, including pattern matching waste.

Estimate how much water you should drink each day.

Track total hours worked per week.

Convert weeks to days for planning and countdowns.

Convert kilograms, pounds, ounces, and other mass units.

Find the minimum conductor cross-section that keeps voltage drop within a percentage you set.

Count words, characters with and without spaces, sentences, paragraphs, and estimated reading time.

Calculate total hours worked between start and end times minus breaks.

Estimate your annual working hours.

Convert years to days for long-term planning and age calculations.

Standardize an observation using its mean and standard deviation.