Poland
G11/G12 energy, employment-contract pay, 800+ and Polish tax wrappers.
27 calculators
Open a calculatorCalculators in your browser
Numbers you need, without an account.
Health, money and everyday figures: BMI and sleep cycles, VAT, a mortgage, a heat pump and solar yield. Polish energy tariffs, payroll and tax rules live under Poland’s flag — language is not a country.
- 118 calculators
- Runs on your device
- English, Polish, German
No sign-in. Results are calculated here. A server copy exists only if you turn it on — only the site owner can see it, with a PIN.
BMI
22.4
Healthy weight
By country
Language is not a country. Polish G11 tariffs, payroll and tax rules sit under Poland’s flag, not in the generic English catalogue.
BMI
Body mass index from weight and height, using the WHO bands for adults.
Open a calculatorBody fat
The US Navy circumference method. A tape-measure estimate, not a DEXA scan.
Open a calculatorCalories
Basal metabolic rate from Mifflin–St Jeor, then a TDEE estimate from activity.
Open a calculatorIdeal weight
Devine ideal body weight from sex and height. A reference, not a goal you must hit.
Open a calculatorDaily water
A litres-per-day estimate from body weight and activity minutes.
Open a calculatorMacros
Split a daily calorie target into grams of protein, carbohydrate and fat.
Open a calculatorWaist-to-hip ratio
Waist divided by hip, a tape measure, not a DEXA scan.
Open a calculatorWeight change
Weeks to a target weight from a daily surplus or deficit, at 7700 kcal per kilogram.
Open a calculatorSteps to distance
Kilometres and a calorie sketch from steps, height and weight.
Open a calculatorRunning pace
From distance and finish time: pace per kilometre and average speed.
Open a calculatorRace predictor
An estimate for 5 km, 10 km, the half marathon and the marathon from a distance you have already raced.
Open a calculatorOne-rep max
Estimate a one-rep max from a set you already lifted, using Epley.
Open a calculatorHeart-rate zones
Karvonen zones from age and resting heart rate. Max HR is 220 minus age.
Open a calculatorVO2 max (Cooper)
A VO2 max sketch from the metres you cover in twelve minutes.
Open a calculatorSleep cycles
A wake time or bedtime from 90-minute cycles plus the minutes you need to fall asleep.
Open a calculatorSleep debt
Hours short of the sleep you wanted, over a run of nights.
Open a calculatorCaffeine left
How much of a dose is still in you after a number of hours.
Open a calculatorFasting window
Hours fasted and the eating window from two clock hours.
Open a calculatorFFMI
Lean mass from body-fat percent, then FFMI from height.
Open a calculatorProtein target
Daily protein from kilograms and grams per kilogram.
Open a calculatorMax heart rate
Two textbook HRmax sketches from age.
Open a calculatorBody surface area
Mosteller surface area from height and weight.
Open a calculatorOvulation window
A fertile window and a due-date sketch from the last period and cycle length.
Open a calculatorPregnancy
Due date, gestational age and a fertile window from the last period and cycle length.
Open a calculatorVAT
Add or remove VAT. Handy for 23% in Poland, 19% in Germany, or any rate you set.
Open a calculatorTip
Tip from a bill and a percent, then split the total between people.
Open a calculatorSplit a bill
Split a bill (and an optional tip) so the shares add back to the total.
Open a calculatorDiscount
Original price and percent off. See the sale price and what you save.
Open a calculatorMargin and markup
Profit, margin % and markup % from cost and selling price.
Open a calculatorBreak-even
How many units cover fixed costs at your price and variable cost.
Open a calculatorLoan overpay
Fixed-rate amortisation. See what an extra monthly payment saves in time and interest.
Open a calculatorDebt payoff
Months to clear a balance at a fixed APR and a fixed payment.
Open a calculatorMortgage
Monthly payment from price, down payment, rate and term. Equal or declining instalments.
Open a calculatorRent vs buy
Cash spent on a mortgage plus housing costs versus rent, and a rough equity figure after a chosen number of years.
Open a calculatorRental yield
Gross and net yearly yield from purchase price, rent, vacancy and running costs.
Open a calculatorBuying power
Move an amount between years with a Polish CPI sketch or with a rate you type.
Open a calculatorFuture price
A sum after N years at a constant inflation rate.
Open a calculatorCompound interest
Future value of a starting amount plus optional monthly deposits.
Open a calculatorCAGR
The constant yearly rate that takes a start value to an end value.
Open a calculatorROI
Gain over cost, and an annualised rate if you enter the years.
Open a calculatorSimple payback
Years until a yearly saving covers what you spent.
Open a calculatorSavings goal
How long a monthly deposit takes to reach a target, with optional interest.
Open a calculatorSavings rate
What share of monthly income you put aside, and the yearly pot.
Open a calculatorEmergency fund
A cash target from monthly spend × months, the gap, and how long the deposit takes.
Open a calculatorFIRE number
A nest egg from yearly spend and a withdrawal rate, then years of saving at a constant return.
Open a calculatorDividend yield
Yield and yearly cash from a per-share dividend and how many shares you hold.
Open a calculatorSubscriptions
Popular subscriptions with current prices, custom lines and monthly and yearly totals.
Open a calculatorChild cost
A rough lifetime bill from what you spend in a month and how many years you count.
Open a calculatorStatutory interest
Simple interest from the NBP reference rate: ordinary, late-payment, or late payment in commercial deals.
Open a calculatorRule of 72
Years for a lump to double at a constant yearly rate.
Open a calculatorReal return
A nominal yearly return stripped of inflation.
Open a calculatorNPV
Net present value of a constant yearly payment minus the outlay.
Open a calculatorAnnuity payment
The monthly payment that empties a pot over the years at a fixed rate.
Open a calculatorEffective APR
The yearly rate after compounding n times.
Open a calculatorHourly invoice
Net and gross for a block of billable days.
Open a calculatorHourly rate
Convert a yearly salary to an hourly rate, or the other way, from hours and working weeks.
Open a calculatorEffective hourly pay
Yearly net ÷ (work hours plus commute), so the hour in the car counts.
Open a calculatorHours in a work year
Workdays and hours after holidays and sick days, then hourly from a salary.
Open a calculatorRaise versus inflation
Nominal raise against inflation: the real percent and the salary that only keeps pace.
Open a calculatorSolar yield
A year’s AC energy from array size, a typical regional yield and one or two roof planes.
Open a calculatorSolar sizing
How large a photovoltaic array would cover a chosen share of yearly electricity use.
Open a calculatorSolar payback
A simple payback period from net install cost, self-consumption and the buy and sell prices.
Open a calculatorPV kit
A bill of materials from real modules, mounts, cable, inverters and batteries, with a street-price sketch.
Open a calculatorHeat pump
A year’s space-heat demand from floor area and a rough insulation class, then electricity at a chosen SCOP versus gas.
Open a calculatorCooling load
A first-pass air-con size from floor area and watts per square metre.
Open a calculatorHeating fuel comparison
The same yearly heat in gas, pellet, coal, wood, oil, resistance heat and a heat pump.
Open a calculatorDomestic hot water
Heat and electricity to raise daily litres by a temperature difference, then a running cost.
Open a calculatorHeat loss through a surface
Kilowatt-hours through a wall, window or roof from U, area and ΔT.
Open a calculatorGas bill
A month of gas from cubic metres, a kWh factor, energy price and a fixed fee.
Open a calculatorAppliance cost
Kilowatt-hours and the bill for a device from watts and hours a day.
Open a calculatorWater and sewage
A period bill from cubic metres and the water and sewage prices.
Open a calculatorEV running cost
Cost per 100 km and per year for an electric car charged at home and at a public post, against a petrol car.
Open a calculatorEV charge time
Hours to move the battery between two states of charge.
Open a calculatorEV range
Kilometres from usable battery and kWh per 100 km, plus a colder-weather hit.
Open a calculatorStandby draw
A year of a device that never quite switches off.
Open a calculatorLED swap
Kilowatt-hours and money saved by swapping a bulb.
Open a calculatorHeating degree days
Season heat from heating degree days and a UA value.
Open a calculatorPercentage
What is x percent of y, what percent is a of b, and the percentage change from A to B.
Open a calculatorPercent change
How much a figure moved, as a percent of the starting value.
Open a calculatorTrigonometry
Sine, cosine and tangent of an angle in degrees, plus the radian.
Open a calculatorPythagoras
Fill two sides of a right triangle; the third and the area come out.
Open a calculatorQuadratic
Real roots of a quadratic, or a linear fallback if a is zero.
Open a calculatorLogarithm
log_base(x), plus the natural log and the common log.
Open a calculatorCombinatorics
Factorial, permutations and combinations for whole n and r.
Open a calculatorGCD and LCM
Greatest common divisor and least common multiple of two integers.
Open a calculatorCircle
Diameter, circumference and area from a radius.
Open a calculatorTriangle area
Area of any triangle from three sides, if they close.
Open a calculatorOhm’s law
Leave one of voltage, current or resistance empty; power comes with it.
Open a calculatorNewton’s second law
Leave one of force, mass or acceleration empty.
Open a calculatorKinetic and potential
Translational kinetic energy and gravitational potential energy.
Open a calculatorFree fall
From rest: fill time or distance, leave the other empty.
Open a calculatorIdeal gas
Leave one of P, V, n or T empty. P in kPa, V in litres.
Open a calculatorWave speed
Leave one of speed, frequency or wavelength empty.
Open a calculatorDensity
Leave one of mass, volume or density empty.
Open a calculatorSnell’s law
The second angle from two indices and an incidence angle.
Open a calculatorThin lens
Leave one of focal length, object distance or image distance empty.
Open a calculatorUnit converter
Weight, length, distance and temperature. Common units, no lookup table.
Open a calculatorCurrency
Euro, zloty, dollar and the other ECB currencies. The reference rate from the last TARGET business day.
Open a calculatorAge
Exact age today from a date of birth.
Open a calculatorDates
Days, weeks and weekdays between two dates, or a date plus a number of days.
Open a calculatorHours
Hours between two clock times, minus a break. Also add minutes to a start time.
Open a calculatorPolish workdays
Count working days between two dates, skipping weekends and Polish public holidays, or add working days to a date.
Open a calculatorTrip fuel
Litres and cost for a trip from distance, consumption and price.
Open a calculatorCommute cost
A month of two-way driving from litres and parking, set against a season ticket.
Open a calculatorCar running cost
Yearly and monthly cost of keeping a car, including straight-line depreciation.
Open a calculatorCar lease payment
A monthly lease from price, down payment, residual value and APR.
Open a calculatorBreathalyzer
A drink diary with clock times. Estimated ‰ at the hour you choose. A model, not a device.
Open a calculatorAlcohol units
Grams of ethanol, 10 g drinks and UK units from volume and ABV.
Open a calculatorTime on the road
Hours and minutes for a distance at a constant speed.
Open a calculatorMonthly fuel
Litres and the bill for a month of kilometres.
Open a calculatorRecipe scale
Scale one amount from the servings the recipe was written for.
Open a calculatorUnit price
Which pack is cheaper per unit, and by what percent.
Open a calculatorPaint needed
Litres from wall area, coats and the tin’s m² per litre.
Open a calculatorFlooring
How many packs of floor from room area, waste and the box coverage.
Open a calculatorDew point
The Magnus dew point from indoor or outdoor air temperature and relative humidity.
Open a calculatorWind chill
How cold it feels from air temperature and wind speed.
Open a calculatorWallpaper
How many rolls from wall perimeter, height, roll size and waste.
Open a calculatorConcrete slab
Cubic metres for a rectangular slab, with a waste percent.
Open a calculator