💰 Money, Rates & Shopping

11 browser-local tools · page 1 of 1

Money, Rates & Shopping. Money questions are usually three numbers and a formula: an amortising loan with the total interest spelled out, compound growth with the compounding intervals visible, a salary converted between hourly, weekly, monthly and annual, a tip split across a table, a discount stacked with a second one, two shop packages compared per unit, an old price carried through inflation, and the running cost of whatever is plugged in.

11 tools on this shelf · 11 listed below

🧮Percentage CalculatorWhat is X% of Y, X is what percent of Y, percent change and add-or-subtract a percentage — with the arithmetic printed beside every answer. 🏦Loan & Interest CalculatorMonthly loan payments, total interest, the effect of extra payments, and compound savings growth — the maths printed honestly, no quote requested. 💼Salary ConverterHourly to annual and back with your real schedule (hours per week, weeks per year), plus the 1.5× overtime figure — gross maths, no tax claims. 🍽️Tip & Bill SplitThe restaurant napkin maths: tip, total and each person's share, with a round-up option so the payment is exact down to the coin. 🏷️Discount CalculatorSale price from any percent off, a second coupon applied honestly on the remainder — and the equivalent single discount exposed. 🛒Unit Price ComparisonThe 500 g vs 1 kg decision settled by price per unit, with the percentage gap and what the other pack would cost at the winner’s rate. ⛽Fuel Economy CalculatorThe pump-and-odometer maths both traditions ask for — L/100 km and km/L and US MPG — plus what the trip actually cost. 💹Inflation CalculatorPrices forward and values backward by compound maths — with the exact doubling year count next to the rule-of-72 shortcut. 💡Electricity Cost CalculatorThe real money an appliance burns: watts-hours to kWh, your own tariff, the annual figure, and what that always-on standby light actually costs. 🌱Compound InterestA lump sum and a monthly habit grown year by year with true compounding maths — including the effective annual rate banks quote differently and the exact doubling time, not just rule of 72. 🧾Tax Add & RemoveAdd GST/SST/VAT to a price or strip it back out of a receipt — with the exact net and tax split, and every common world rate compared on the same number.

How these tools work

The formulas are the published ones — the annuity payment equation, the compound amount formula, the Mifflin-style logic of percentage change — and the pages print the steps beside the answer so you can check them. Nothing here is a quote, a recommendation or a lead for a lender; it is arithmetic, and the reason it is worth doing locally is that a payslip, a loan offer or an electricity tariff has no business travelling to somebody else’s server.

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