Ultimate Calculator
Ultimate Calculator is a free hub of 32 online calculators for money, work, home, car, dates and everyday maths. Every tool runs instantly in your browser — VAT, discount, loan, percentage, tip and many more — with no sign-up and complete privacy. Your inputs never leave your device.
32 free online calculators
All 32 calculators are grouped into six categories and each one has its own permanent page with a clear explanation of what it does, the formula it uses, and a worked example. Pick a category below and open any calculator.
Calculator categories
Money
Calculators for tax, pricing, savings and borrowing.
- VAT Calculator — Add or remove VAT from any amount with custom rates and an optional discount.
- Discount Calculator — Calculate the final sale price and savings from a percentage discount.
- Percentage Calculator — Find what X% of any value is, plus the value increased by that percentage.
- Profit Margin Calculator — Calculate profit, margin percentage and markup from cost and selling price.
- Markup Calculator — Build a selling price from cost and markup percentage, with profit and margin.
- Tip Calculator — Work out the tip on a bill and split the total between any number of people.
- Loan Calculator — Turn a loan amount, rate and term into a monthly payment with total interest.
- Mortgage Calculator — Estimate the monthly repayment on a home loan with total interest and repaid.
- Interest Calculator — Compare simple and compound interest on the same principal over time.
Work
Calculators for salary, hourly pay, overtime and freelancer income.
- Salary Calculator — Break an annual salary down into monthly, weekly, daily and hourly pay.
- Hourly Rate Calculator — Convert an annual salary into an hourly rate using your hours and weeks.
- Overtime Calculator — Calculate regular and overtime pay at a premium multiplier.
- Freelancer Income Calculator — Estimate gross, tax and net income from your hourly rate and hours.
- Employer Cost Calculator — See the true cost of hiring including employer contributions.
Home
Calculators for mortgages, utilities and home improvement.
- Home Mortgage Calculator — Estimate the monthly repayment on a property loan with total interest.
- Rent vs Buy Calculator — Compare the total cost of renting against buying over the same period.
- Electricity Cost Calculator — Turn your kWh usage into a monthly and annual electricity cost.
- Area Calculator — Find the floor area of a rectangular space in m², ft² and acres.
- Paint Calculator — Estimate how many litres of paint a room needs for a given number of coats.
Car
Calculators for fuel, trip costs, EV charging and depreciation.
- Fuel Cost Calculator — Estimate how much fuel a journey uses and what it costs.
- Trip Cost Calculator — Add fuel, tolls and parking to see the total cost of a journey.
- EV Charging Cost Calculator — Estimate the cost of charging an electric vehicle.
- Depreciation Calculator — Estimate how much an asset loses in value over time.
Date & Time
Calculators for age, date differences and countdowns.
- Age Calculator — Work out your exact age from your date of birth in years, months and days.
- Date Difference Calculator — Count the days, weeks and months between any two dates.
- Working Days Calculator — Count business days between two dates, excluding weekends.
- Countdown Calculator — Show how long is left until a future date in days, hours and minutes.
Everyday
Calculators for unit conversion, health and quick maths.
- Unit Converter — Convert between units of length, weight, temperature, volume and area.
- BMI Calculator — Find your Body Mass Index from your weight and height and its category.
- Average Calculator — Summarise a list of numbers with mean, sum, count, min and max.
- Ratio Calculator — Simplify a ratio between two values to its simplest form.
- Fraction Calculator — Add, subtract, multiply or divide two fractions and see the result.