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Browse the full Figuredly calculator library by topic, from salary and mortgage tools to calories, size conversions, dates, home projects and business metrics. Start with a category when you know the area, or search for the exact calculation you need.

Calculator topics

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Each topic groups calculators that solve related problems, with guides nearby when the assumptions need more context.

20 calculatorsFinanceUse these tools to compare salary, borrowing, savings, budgets and repayment scenarios before making money decisions.11 calculatorsHealthUse these estimates as starting points for training, nutrition and body measurements, with clear limits where health context matters.13 calculatorsMathsChoose a quick solver for everyday maths, schoolwork, statistics, geometry and number checks.10 calculatorsScienceCheck common science and engineering formulas with visible units, assumptions and result notes.10 calculatorsSizesCompare size labels, measurements and fit starting points before buying clothes, shoes or accessories.8 calculatorsHomeEstimate room measurements, materials and project quantities before you buy supplies or book work.6 calculatorsTimeWork out dates, durations, time differences and countdowns without reaching for a spreadsheet.13 calculatorsBusinessCheck core business numbers for marketing, pricing, profitability, cash flow and customer value.

Financial Calculators

Plan pay, borrowing, repayments, savings and everyday money decisions with transparent formulas and clear assumptions.

FinanceTake Home PayEstimate annual, monthly and weekly take-home pay for the 2026 to 2027 UK tax year.FinanceMortgageEstimate monthly mortgage payments, total interest and loan-to-value from property price, deposit, rate and term.FinanceLoanCalculate monthly payments, total repayment and interest cost for a fixed-rate personal loan.FinanceCurrencyConvert an amount using a manual exchange rate and compare the effect of fees or card markups.FinanceCompound InterestProject savings growth with starting balance, regular deposits, annual rate and compounding frequency.FinanceVATAdd or remove VAT from a price and see the net, VAT and gross amounts.FinanceSavings GoalWork out the monthly saving needed to reach a goal by a target date, including starting balance, interest and payment timing.FinanceCard PayoffEstimate how long it could take to clear a credit card balance with a fixed monthly payment.FinanceDebt SnowballCompare a debt snowball payoff plan across three balances with an extra monthly payment.FinanceAPREstimate APR from amount borrowed, fees, monthly payment and loan term.FinanceInflationEstimate how inflation changes future cost and purchasing power using a chosen annual rate.FinanceRetirementProject retirement savings from current age, savings, monthly contributions and expected return.FinanceBudget PlannerSplit monthly income across bills, essentials, debt, saving and flexible spending.FinancePay RiseCalculate a gross pay increase from a percentage or fixed amount and compare annual, monthly and weekly change.FinanceHourly WageConvert hourly pay into weekly, monthly and annual gross earnings with overtime and working weeks.FinanceDebt-to-IncomeCalculate debt-to-income ratio from monthly income, housing payments, existing debts and a possible new payment.FinanceEmergency FundEstimate how much emergency cash to hold and how long it may take to reach your target.FinanceRent AffordabilityCompare rent, bills and take-home income to estimate a comfortable monthly housing share.FinanceNet WorthAdd assets and debts to estimate personal net worth and liquid asset coverage.FinanceMortgage AffordabilityEstimate a property budget from household income, deposit, monthly debts and an income multiple.

Health and Fitness Calculators

Estimate calorie needs, body metrics, training targets and nutrition splits with careful health disclaimers and plain formula notes.

HealthCaloriesEstimate daily maintenance calories using the Mifflin-St Jeor equation and an activity multiplier.HealthMacrosSplit daily calories into protein, fat and carbohydrate targets using body weight and preferred fat percentage.HealthBMICalculate adult body mass index from height and weight, with standard category ranges.HealthPaceCalculate running pace, finish time or distance from any two values, with pace per kilometre, pace per mile and average speed.HealthBody FatEstimate body fat percentage from circumference measurements using the US Navy method.HealthBMREstimate basal metabolic rate using the Mifflin-St Jeor equation, then compare it with activity-adjusted calorie needs.HealthOne Rep MaxEstimate one rep max and training percentages from weight lifted and reps completed.HealthHeart ZonesEstimate maximum heart rate and training zones from age and resting heart rate.HealthWater IntakeEstimate daily fluid needs from body weight, activity and warm conditions.HealthDue DateEstimate a pregnancy due date from the first day of the last menstrual period.HealthWaist Hip RatioCalculate waist-to-hip ratio from waist and hip measurements, with category notes and clear health limits.

Maths Calculators

Solve common arithmetic, algebra, geometry and statistics tasks quickly, with enough working to help users understand the result.

MathsPercentageCalculate percentages, percentage change and reverse percentages for discounts, marks and comparisons.MathsScientificEvaluate arithmetic, powers, roots and common trigonometric functions in a clean browser calculator.MathsFractionsAdd, subtract, multiply or divide two fractions and reduce the result.MathsRatioSimplify a ratio, compare parts and scale a ratio to a chosen total for recipes, mixtures, maths problems and planning.MathsQuadraticSolve ax squared plus bx plus c equals zero and show the discriminant.MathsStandard DeviationCalculate mean, variance and standard deviation from a list of numbers.MathsWeighted AverageCalculate a weighted average from values and weights such as credits, quantities or percentage shares.MathsProbabilityCalculate single-event probability, odds and the chance of at least one success across repeated trials.MathsAreaCalculate the area of a rectangle, triangle, circle or trapezium for maths, rooms, gardens and material estimates.MathsVolumeCalculate volume for a cuboid, cylinder, sphere or cone, with clear units for maths, science and project estimates.MathsPrime FactorsBreak a whole number into its prime factors, with factor pairs and a clear result for checking maths work.MathsRandom NumberGenerate repeatable random-style whole numbers from a range and seed for simple draws, tests and classroom examples.MathsGPACalculate a weighted grade point average from course credits and grades on a common 4.0 scale.

Science and Engineering Calculators

Practical tools for physics, chemistry, units and technical formulas, designed for quick checking and repeat use.

ScienceUnit ConversionConvert common length, weight, temperature and volume units with instant results.ScienceOhm's LawCalculate voltage, current, resistance or power from any two known electrical values.ScienceSpeed Distance TimeCalculate speed, distance or time when you know the other two values, with clear units for travel, sport and science checks.ScienceDensityCalculate density, mass or volume when you know the other two values, with unit notes for science and engineering checks.ScienceForceCalculate force from mass and acceleration using Newton's second law, with results in newtons for physics checks.SciencePressureCalculate pressure from force and area, with pascal, kilopascal and bar estimates for science and engineering.ScienceMolarityCalculate molarity from moles of solute and solution volume, with concentration shown in mol per litre.ScienceDilutionCalculate stock solution volume using C1V1 equals C2V2, with final volume and dilution ratio shown clearly.SciencepHConvert hydrogen ion concentration to pH, or pH to hydrogen ion concentration.ScienceEnergyCalculate kinetic, electrical or heat energy using common formulas, with joule and kilojoule results where relevant.

Fashion and Size Calculators

Compare size systems, body measurements and fit notes across shoes, dresses, jeans, rings and brand-specific charts.

SizesShoe SizesCompare UK, US men's, US women's, EU and Mondopoint shoe sizes with practical fit notes.SizesDress SizesEstimate UK, US and EU dress sizes from bust, waist and hip measurements.SizesRing SizeEstimate UK and US ring size from inner diameter or finger circumference.SizesBrand Shoe FitCompare a usual shoe size with broad fit notes for popular footwear brands.SizesDress ComparisonConvert a women's dress size between UK, US, EU, French and Italian systems.SizesJeans SizeEstimate jeans waist and leg size from body measurements, then compare the result with brand size charts.SizesBra SizeEstimate UK bra band and cup size from underbust and bust measurements.SizesKids ShoesEstimate children's shoe size from foot length and growth room, with approximate UK and EU sizes for a first fit check.SizesHat SizeEstimate hat size from head circumference, including centimetre size, UK hat size and a general S to XL label.SizesClothing SizesConvert broad women's, men's and children's clothing sizes across common systems.

Home and DIY Calculators

Estimate paint, flooring, concrete, room measurements and project quantities before buying materials.

HomePaintEstimate litres of paint needed from wall area, coats and paint coverage.HomeTilesEstimate how many tiles are needed for a floor or wall, including waste.HomeFlooringEstimate flooring packs from room dimensions, pack coverage, extra area and waste allowance.HomeConcreteEstimate concrete volume for slabs, footings and simple rectangular pours.HomeRoof PitchCalculate roof pitch, angle and slope factor from rise and run for roofing, planning and material estimates.HomeBTUEstimate room heating output in BTU per hour from room size and insulation.HomeMoving BoxesEstimate how many moving boxes you may need for a house move, based on rooms, belongings and packing style.HomeWallpaperEstimate wallpaper rolls from wall dimensions, openings, roll size and waste allowance.

Time and Date Calculators

Calculate age, date differences, working days, hours, time zones and countdowns.

TimeAgeCalculate exact age in years, months and days from a date of birth, plus total days and the next birthday.TimeDate DifferenceCount days, weeks, months and years between two dates, with optional inclusive counting for deadlines and planning.TimeBusiness DaysCount weekdays between two dates and optionally exclude UK bank holidays entered manually.TimeHoursCalculate hours between two times with an optional break, including shifts that cross midnight.TimeTime ZoneConvert a date and time between two UTC offsets, with the time difference and converted local time.TimeCountdownCount days, weeks and approximate months until a future date for deadlines, events and planning.

Business Calculators

Model conversion rates, CPC, CPM, cost per conversion, margins, returns, break-even points and cash flow questions.

BusinessProfit MarginCalculate gross profit, profit margin and markup from cost and selling price.BusinessROICalculate return on investment from cost, return and optional time period.BusinessBreak-EvenCalculate the units and revenue needed to cover fixed and variable costs.BusinessMarkupAdd a markup to cost and compare markup percentage with profit margin.BusinessConversion RateCalculate website, ecommerce, sales, retail or marketing conversion rate, plus target uplift and value per visitor.BusinessConversion Rate IncreaseCalculate the extra conversions, uplift and value needed to move from your current conversion rate to a target rate.BusinessCPMCalculate CPM, cost per thousand impressions, CPC, CTR and cost per conversion for advertising campaigns.BusinessCash RunwayEstimate how many months a business can operate from cash balance, revenue and expenses.BusinessPayback PeriodEstimate how long an investment takes to repay its upfront cost from monthly benefit after ongoing costs.BusinessCost Per ConversionCalculate cost per conversion, CPA, conversion rate, revenue per conversion and ROAS from campaign spend and conversions.BusinessCPCCalculate CPC, cost per click, CPM, CTR, cost per conversion and ROAS from paid campaign data.BusinessLifetime ValueEstimate customer lifetime value from order value, purchase frequency, lifespan, margin and acquisition cost.BusinessROASCalculate return on ad spend, gross profit after margin and break-even ROAS.