Tallytopia
Free online calculators with a transparent, editable breakdown — change any input and everything recalculates instantly.
Just need to crunch numbers? Open the scientific calculator.
- Mortgage Payment CalculatorWork out the monthly payment on a fixed-rate mortgage from the loan amount, interest rate and term.
- Compound Interest CalculatorSee how a lump sum grows over time with compound interest, at any compounding frequency.
- Loan Repayment CalculatorMonthly repayment on a personal or car loan from the amount, interest rate and term.
- Savings Goal CalculatorHow long it takes to reach a savings goal at a given monthly contribution and interest rate.
- Break-Even CalculatorHow many units you must sell to cover your fixed costs, from price and variable cost.
- Salary to Hourly CalculatorConvert an annual salary into its hourly, weekly and monthly equivalents.
- Markup & Margin CalculatorProfit, markup and margin from a product's cost and selling price — and why markup and margin differ.
- VAT CalculatorAdd VAT to a net price: see the VAT amount and the gross (VAT-inclusive) total.
- Irish VAT CalculatorAdd Irish VAT to a net price at the 23% standard rate — or any reduced rate.
- BTW Calculator (Netherlands VAT)Add Dutch BTW to a net price at the 21% standard rate — or the 9% reduced rate.
- MwSt Calculator (German VAT)Add German MwSt to a net price at the 19% standard rate — or the 7% reduced rate.
- TVA Calculator (French VAT)Add French TVA to a net price at the 20% standard rate — or the 10%, 5.5% or 2.1% reduced rates.
- South African VAT CalculatorAdd South African VAT to a price at the 15% standard rate.
- Australian GST CalculatorAdd Australian GST to a price at the 10% rate — see the GST amount and the total.
- New Zealand GST CalculatorAdd New Zealand GST to a price at the 15% rate — see the GST amount and the total.
- India GST CalculatorAdd Indian GST to a price at the 18% standard slab — or any of the 5%, 12% or 28% slabs.
- Sales Tax CalculatorAdd US sales tax to a price — enter your combined state and local rate.
- BMI CalculatorCalculate your body mass index (BMI) from your weight and height.
- BMR CalculatorEstimate your basal metabolic rate — the calories your body burns at complete rest.
- TDEE Calculator — Daily Calorie NeedsEstimate the calories you burn per day from your BMR and activity level.
- Ideal Weight CalculatorEstimate an ideal body weight from height and sex using the Devine formula.
- Water Intake CalculatorA daily drinking-water estimate from your body weight and exercise time.
- Body Fat Calculator (US Navy Method)Estimate body fat percentage from tape measurements using the US Navy circumference formula.
- Macro CalculatorSplit daily calories into grams of protein, carbs and fat at your chosen percentages.
- One Rep Max CalculatorEstimate your one-rep max from a weight and rep count, with common training percentages.
- Pregnancy Due Date CalculatorEstimate a due date from the first day of the last menstrual period, adjusted for cycle length.
- Ovulation CalculatorEstimate your ovulation date and fertile window from your last period and cycle length.
- Pythagorean Theorem CalculatorFind the hypotenuse of a right triangle from its two legs — plus area and perimeter.
- Circle CalculatorArea, circumference and diameter of a circle from its radius.
- Triangle Area CalculatorThe area of any triangle from its base and height.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 — both roots and the discriminant, step by step.
- Slope CalculatorSlope, y-intercept and distance between two points on a line.
- Exponent CalculatorRaise any base to any power, including negative and fractional exponents.
- Root CalculatorSquare roots, cube roots and any nth root of a number.
- Percent Error CalculatorHow far a measured value is from the true value, as a percentage.
- GCF & LCM CalculatorGreatest common factor and least common multiple of two numbers.
- Combinations & Permutations CalculatorHow many ways to choose or arrange r items from a set of n.
- Z-Score CalculatorHow many standard deviations a value sits above or below the mean.
- Square Footage CalculatorThe square footage of a room or area from its length and width — with square yards and square meters.
- Concrete CalculatorConcrete for a slab: cubic yards to order, or how many 80 lb and 60 lb bags to buy.
- Paint CalculatorHow many gallons of paint a room needs, from wall length, height, doors and windows.
- Roofing CalculatorRoof area, roofing squares and shingle bundles from the house footprint and roof pitch.
- Tile CalculatorHow many tiles a floor or wall needs, by tile size, with waste included.
- Mulch CalculatorCubic yards or bags of mulch for a bed, from its area and depth.
- Gravel CalculatorCubic yards and tons of gravel for a driveway or path, from area and depth.
- Tip CalculatorWork out the tip, the total bill, and each person's share when splitting.
- Percentage CalculatorWork out what X% of a value is — discounts, tips, statistics, anything.
- Percentage Change CalculatorThe percentage increase or decrease from one value to another.
- Discount CalculatorSee the sale price and how much you save from a percentage discount.
- Fuel Cost CalculatorThe fuel cost of a trip from distance, consumption (L/100km) and fuel price.
- Electricity Cost CalculatorWhat an appliance costs to run, from its wattage, daily use and your electricity price.
- Final Grade CalculatorWhat score do you need on the final exam to reach your target grade?
- Age CalculatorYour exact age in years, months and days — and your total days alive.
- Days Between Dates CalculatorCount the days, weeks and calendar months between any two dates.
- Date Calculator — Add or Subtract DaysWhat date is 90 days from today? Add or subtract days, weeks, months or years from any date.