Free Online Calculators

Percentage, statistics, loans, interest, tax, discounts and currency.

Convertto offers calculators for percentages, averages and standard deviation, primes and factorials, loan EMI and compound interest, VAT and sales tax, discounts, tips and live currency conversion. Each shows the working, not just the answer, so results can be checked.

48 tools in this category

Bill SplitterSplit a bill evenly or by what each person ordered, with tip and tax handled correctly.

Break-Even Point CalculatorFind how many units you must sell to cover your costs.

CAGR CalculatorCompound annual growth rate between two values, with the year-by-year path.

Calorie CalculatorTurn a daily calorie target into a weekly deficit, a projected rate of change and a per-meal split.

Compound Interest CalculatorProject savings growth with compound interest and regular contributions.

Currency ConverterConvert between 30+ currencies using official European Central Bank reference rates.

Debt Payoff CalculatorCompare snowball and avalanche repayment strategies across several debts.

Weighted Decision MatrixScore options against weighted criteria and see which choice actually wins.

Depreciation CalculatorStraight-line, declining balance, double-declining and sum-of-years depreciation schedules.

Dice RollerRoll any number of dice with any number of sides, plus a modifier.

Discount CalculatorWork out sale prices, stacked discounts and how much you actually save.

Emergency Fund CalculatorSize an emergency fund from your real monthly outgoings and see how long it takes to build.

Exponent, Root & Logarithm CalculatorCalculate powers, nth roots, logarithms in any base, and exponentials.

FD CalculatorWork out what a fixed deposit matures to, with quarterly compounding and TDS accounted for.

Fraction CalculatorAdd, subtract, multiply and divide fractions, with the result simplified.

Freelance Rate CalculatorWork out the hourly and day rate you need to hit a target income after time off, costs and tax.

GCD & LCM CalculatorFind the greatest common divisor and lowest common multiple of any set of numbers.

GST CalculatorAdd GST to a price or work backwards from a GST-inclusive total, with the CGST/SGST split.

Inflation CalculatorSee what an amount of money is worth after inflation over any period.

Invoice GeneratorCreate invoices, quotes and GST tax invoices, keep clients and history in your browser, and download a clean PDF — no sign-up.

Loan & EMI CalculatorCalculate monthly repayments, total interest and the full cost of a loan.

Markup & Margin CalculatorConvert between markup and margin — they are not the same number, and confusing them costs money.

Meeting Cost CalculatorWork out what a meeting actually costs in salary time, per session and per year.

Mortgage Comparison CalculatorCompare two loan offers side by side — payment, total interest and the true cost with fees.

NPV & IRR CalculatorNet present value, internal rate of return and payback period for a series of cash flows.

Percentage CalculatorWork out percentages, percentage change and reverse percentages with the working shown.

Permutation & Combination CalculatorCalculate nPr, nCr and factorials for counting and probability problems.

Pregnancy Due Date CalculatorEstimate a due date from a last period, conception date or an early scan, with milestones.

Prime Number Checker & FactoriserCheck whether a number is prime and see its full prime factorisation.

Profit Margin & Markup CalculatorCalculate margin, markup and profit from cost and selling price — they are not the same thing.

Quadratic Equation SolverSolve ax² + bx + c = 0 with real or complex roots and see the discriminant.

Random Number GeneratorGenerate random numbers in any range, with optional uniqueness — for draws and sampling.

Ratio CalculatorSimplify ratios, scale them, and solve for a missing value in a proportion.

RD CalculatorWork out what a monthly recurring deposit matures to, with quarterly compounding.

Rent vs Buy CalculatorCompare the total cost of renting against buying over a period you choose.

Retirement Withdrawal CalculatorModel a safe withdrawal rate and see how long a pot lasts against inflation and returns.

ROI CalculatorCalculate return on investment and the annualised rate.

Salary ConverterConvert between hourly, daily, weekly, monthly and annual pay.

Savings Goal CalculatorWork out how long it takes to reach a savings target, and what to save monthly.

Simple Interest CalculatorCalculate simple interest and see how it differs from compound interest.

SIP CalculatorProject a monthly investment plan, with optional annual step-up and the invested-versus-gain split.

Mean, Median & Mode CalculatorCalculate mean, median, mode, range, variance and standard deviation from a list of numbers.

Tip Calculator & Bill SplitterWork out the tip and split a bill evenly between any number of people.

Trigonometry CalculatorCalculate sine, cosine, tangent and their inverses in degrees or radians.

Unit Price ComparatorWork out which pack size is actually cheaper per unit, weight or volume.

VAT & Sales Tax CalculatorAdd or remove VAT, GST or sales tax at any rate, with the net and tax split out.

Weighted Average CalculatorCalculate a weighted mean — for grades, ratings and portfolio returns.

Z-Score CalculatorCalculate how many standard deviations a value sits from the mean, with percentile.

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