The working, shown
The formula and assumptions sit right beside the answer, so you can see how it was reached and where it could be wrong.
P × r ÷ (1 − (1 + r)−n)$1,169.18/ month FREE · PRIVATE · SHOWS ITS WORKING
Every answer,
fully worked.
48 calculators for money, tax, home, tech and everyday life, from a salary after tax to an AI bill. See the formula, see what moves the result, share it. No account.
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All 48 tools ↗Start with a decision.
Housing decisionRent vs buyCompare the long-run net worth of buying a home with renting and investing the difference, and see when buying breaks even.CompareJob offer comparison: two salaries after taxCompare two job offers after tax and work costs to see which really leaves you with more money each year.Hidden spendingSubscription cost & wasteSee what your subscriptions cost per year, how much goes on ones you barely use, and what that money could grow to if invested.Electric vehiclesEV vs petrol running costCompare yearly fuel cost for a petrol car and an electric car, and what the difference adds up to over the years you keep it.AI developmentAI token costEstimate the cost of language-model usage using your own provider’s token rates.
Pick a lane.
07EverydayDaily questions, solved in seconds.13Money & businessModel costs, cash and better choices.10Tax & salaryTake-home pay, country by country.02Islamic financeZakat and inheritance, with the rules shown.07Home & energyKnow the cost before you commit.04TechnologyPractical maths for digital projects.03StudyPlan progress and achieve targets.02Health & fitnessUnderstand basic measurements.
WHY IT'S DIFFERENT
Not just a number.
A result you can't check is just a guess. Every calculator here shows its reasoning and lets you stress-test it.
What moves your answer
Every tool ranks its inputs by how much a 10% change shifts the result, so you know which assumption to sweat.
Shareable in one tap
Save a result card as an image, send a link with your inputs, or embed the calculator on your own site.
Loan payment$1,169.18calculator786 · shows its working
Every calculator
Find a topic, then change the numbers to make the result yours.
Everyday
Daily questions, solved in seconds.
7 toolsMoney & business
Model costs, cash and better choices.
13 toolsCompound interestSaving & investingLoan paymentBorrowingSavings goalPlanningInflation & purchasing powerPricesSalary to hourly payEmploymentProfit margin & markupBusiness pricingBreak-even unitsBusiness planningVAT / sales taxTax arithmeticWebsite ad revenueCreator earningsSubscription cost & wasteHidden spendingSmall habit lifetime costHidden spendingReal hourly rateWork & timeRent vs buyHousing decision
Tax & salary
Take-home pay, country by country.
10 toolsUK salary after taxUnited KingdomUS salary after tax (federal)United StatesIndia salary after tax (new regime)IndiaPakistan salary after taxPakistanAustralia salary after taxAustraliaJob offer comparison: two salaries after taxCompareIs working an extra day worth it?Working daysPay rise vs childcare and household costsHousehold budgetSecond job tax calculatorExtra incomeRent affordability calculatorHousing budget
Islamic finance
Zakat and inheritance, with the rules shown.
2 toolsHome & energy
Know the cost before you commit.
7 toolsTechnology
Practical maths for digital projects.
4 toolsStudy
Plan progress and achieve targets.
3 toolsHealth & fitness
Understand basic measurements.
2 toolsAbout Calculator786
What is Calculator786?
Calculator786 is a free collection of 48 online calculators for everyday maths, money and business, home and energy, technology, study and health. Each one shows its formula and assumptions next to the answer.
How is Calculator786 different from other calculator sites?
Every result comes with the formula, the assumptions and a ranked list of which input moves the answer most, so you can see what actually matters. You can compare two scenarios side by side and save a result card as an image to share. Calculations run in your browser and no account is needed.
Is Calculator786 free and private?
Yes, it is free with no sign-up. Inputs are processed in your browser and are not sent to a server. A share link contains the numbers you choose to share, so check it before sending.
Which currencies and regions does it support?
Amounts can be labelled in 33 currencies and numbers follow your browser locale. The currency selector changes labels only and does not convert between currencies. Tax rates, prices and other local figures are entered by you, so the tools work anywhere.
Can I trust the results?
Calculations use documented formulas and automated tests. Results are estimates based on the assumptions shown, not financial, tax, legal or medical advice.
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