Calculators
98 calculators and converters for money, health, dates, home projects and units. Nothing you type leaves your device.
Money and business · 30
- 50/30/20 Budget CalculatorThe three targets, and how far your actual spending sits from them.
- Pay Rise CalculatorWhat a raise is worth once inflation has taken its share.
- APR to APY CalculatorThe same rate compounded, and what the gap is actually worth.
- Rent vs Buy CalculatorThe year buying overtakes renting, once selling costs are counted.
- Credit Card Payoff CalculatorHow long a fixed payment takes, against what the minimum costs you.
- Car Loan CalculatorThe payment, the tax, and when you stop owing more than it is worth.
- Bill SplitterWith tip, tax and the odd remainder handled.
- Retirement CalculatorWhat you will have, and what it will actually buy.
- Unit Price ComparisonPrice per unit for two packs, side by side.
- Savings Goal CalculatorWhat to put aside each month, with interest doing its share.
- Time Card CalculatorA week of shifts, with breaks and overtime.
- Salary to Hourly CalculatorWhat a job actually pays per hour you are there.
- Inflation CalculatorWhat an amount is worth after years of price rises.
- Home Affordability CalculatorWhat lenders will allow, and what leaves you comfortable.
- Electricity Cost CalculatorWhat one device actually costs you a year.
- Rule of 72 CalculatorHow long money takes to double, and what the shortcut gets wrong.
- ROI CalculatorTotal return, and the annualised rate that lets you compare.
- Margin CalculatorThe two numbers people mix up, side by side.
- Break-Even CalculatorHow many units before the fixed costs are paid off.
- Fuel Cost CalculatorWhat a journey costs in fuel, and per person if you share it.
- Loan CalculatorWhat the monthly payment is, and what the loan really costs.
- Mortgage CalculatorThe whole monthly cost — not just the part the lender quotes.
- Refinance CalculatorHow long the costs take to pay back — and what resetting the term hides.
- Debt-to-Income CalculatorThe number a mortgage lender decides on, before you apply.
- Compound Interest CalculatorWhat regular saving actually turns into, and how much of it is growth.
- VAT CalculatorAdd tax to a net price, or strip it out of a gross one.
- Tip CalculatorWork out the tip and split the bill, without the mental arithmetic.
- Simple Interest CalculatorInterest on the principal only, and what compounding would add.
- Hourly to Salary CalculatorConvert an hourly rate to yearly, monthly and weekly pay.
- Discount CalculatorWhat you pay, what you save, and what stacked offers really mean.
Health and fitness · 14
- TDEE CalculatorWhat you burn in a day, and the targets that follow from it.
- One Rep Max CalculatorFour formulas side by side, and the working weights they imply.
- Ovulation CalculatorCounted back from the next period, not forward from the last.
- Due Date CalculatorFrom your last period, with the trimester dates.
- Water Intake CalculatorFrom bodyweight and activity, counting food and coffee.
- Calorie Deficit CalculatorHow long a given deficit actually takes.
- Sleep CalculatorBedtimes that land between cycles, not in the middle of one.
- Macro CalculatorProtein, fat and carbs in grams, from your calorie target.
- Heart Rate Zone CalculatorFive zones, from your maximum and resting rate.
- BMI CalculatorBody Mass Index from your height and weight, worked out instantly.
- BMR CalculatorThe calories your body burns doing nothing at all.
- Body Fat CalculatorThe US Navy tape method — what BMI cannot tell you.
- Ideal Weight CalculatorFour clinical formulas, side by side, rather than one false number.
- Running Pace CalculatorPace per kilometre and mile, with your finish times.
Dates and time · 7
- Date Add & Subtract CalculatorWhat date falls a given time from another, and which weekday.
- Dog Age CalculatorNot seven to one — size changes everything after year two.
- Hours Between TimesHours worked between two times, including overnight shifts.
- Age CalculatorExact age in years, months and days — and when the next birthday lands.
- Date Difference CalculatorHow long between two dates, counted every useful way at once.
- Days Until CalculatorCount down to a date — in days, weeks and working days.
- Working Days CalculatorBusiness days between two dates, with your own holidays subtracted.
Home and DIY · 4
Everyday maths · 5
- Mean, Median and Mode CalculatorAll three averages at once, and which one your data calls for.
- Final Grade CalculatorThe mark required, and whether it is reachable.
- Percentage Change CalculatorThe change between two numbers, and why it does not reverse.
- Aspect Ratio CalculatorKeep proportions when resizing, and name the ratio.
- Percentage CalculatorFour different percentage questions, without guessing which formula.
Length and distance · 12
- Yards to Meters ConverterExactly 0.9144 — the two are close and not equal.
- Meters to Yards ConverterAdd about a tenth — or use the exact factor.
- CM to Feet ConverterHeight in the form people actually say it.
- Inches to MM ConverterExactly 25.4 — the one conversion with no rounding.
- MM to Inches ConverterConvert millimetres to inches, with the nearest sixteenth.
- Feet to CM ConverterConvert a height in feet to centimetres for metric forms.
- CM to Inches ConverterConvert centimetres to inches, with feet and inches too.
- Feet to Meters ConverterConvert feet to metres for plans, specs and paperwork.
- Inches to CM ConverterConvert inches to centimetres for forms, shipping and furniture.
- KM to Miles ConverterConvert kilometres to miles for running, driving and maps.
- Meters to Feet ConverterConvert metres to feet and inches, for height and altitude.
- Miles to KM ConverterConvert miles to kilometres for travel, fitness and fuel.
Weight · 6
- Ounces to Grams ConverterWeight ounces, for baking from an American recipe.
- KG to Stone ConverterWith the pounds remainder, the way it is actually said.
- Stone to KG ConverterConvert stone to kilograms, the British body-weight unit.
- Grams to Ounces ConverterConvert grams to ounces for recipes and postage.
- KG to Pounds ConverterConvert kilograms to pounds, and to stone for UK readers.
- Pounds to KG ConverterConvert pounds to kilograms for forms, freight and medicine.
Volume and cooking · 5
- Tablespoons to ML ConverterThree different tablespoons exist. All three are shown.
- Fluid Ounces to ML ConverterFor following an American recipe in metric.
- ML to Fluid Ounces ConverterConvert millilitres to fluid ounces, US and imperial.
- Liters to Gallons ConverterConvert litres to US gallons, with imperial alongside.
- Gallons to Liters ConverterConvert US gallons to litres, with imperial shown as well.
Speed and fuel · 6
- MPH to Knots ConverterSubtract about an eighth for a mental estimate.
- Knots to MPH ConverterWith the Beaufort force, which is defined in knots.
- MPG to L/100km ConverterA reciprocal, not a multiplication — higher mpg is lower L/100km.
- L/100km to MPG ConverterFor reading a European spec sheet in American units.
- MPH to KM/H ConverterConvert speeds and limits between mph and km/h.
- KM/H to MPH ConverterConvert km/h to mph for driving abroad.
Area · 3
Temperature, energy and power · 6
- Kilojoules to Calories ConverterDivide by four for a close-enough estimate.
- Calories to Kilojoules ConverterFor reading an Australian or European nutrition label.
- kW to HP ConverterFor reading a European registration document.
- HP to kW ConverterThree horsepowers exist. This shows the two that matter.
- Celsius to FahrenheitConvert °C to °F, with kelvin alongside.
- Fahrenheit to CelsiusConvert °F to °C for weather, ovens and thermostats.