Finance Calculators.

Takes a sticker price and a percentage off, and shows exactly what you pay. It computes the amount saved, the price after discount, and — if you add a sales tax rate — applies the tax to the discounted price, the way registers actually do.

Use it for sales & promoscoupon stackingprice comparisonretail pricing

Works both directions: add VAT to a net amount (net × (1 + rate)) or remove VAT from a gross total (gross ÷ (1 + rate)) to recover the net and the tax portion. A quantity field turns a unit price into full invoice totals.

Use it for invoicestax-exclusive pricingbookkeepingfreelance quotes

Turns any bill and tip percentage into the tip amount, the grand total and each person's share. It also prints the 15% and 20% benchmarks so you can see at a glance whether you're tipping below, at or above the usual standard.

Use it for restaurantstaxis & deliverybar tabshotel service

Built for the moment the check arrives at a group dinner. Enter the total, the tip and the number of people, and it breaks everything down: bill per person, tip per person, and the final share each person owes — no more dividing on a phone calculator under the table.

Use it for group dinnersshared travel coststeam lunchesparty expenses

Uses the standard amortization formula — P·r ÷ (1 − (1+r)^−n) — to turn a principal, annual rate and term into the fixed monthly payment, the total interest you'll pay over the life of the loan, and the month you'll be debt-free.

Use it for car loanspersonal loansrate comparisonpayoff planning

The Equated Monthly Instalment calculator takes the term in months and digs one level deeper than the loan tool: it shows how much of your very first payment goes to interest versus principal, plus the daily cost of carrying the loan.

Use it for consumer creditequipment financeshort-term loansmonthly budgeting

Grows a principal at any compounding frequency — daily, monthly, quarterly, semi-annual or annual — and optionally adds a monthly contribution on top. The output separates what you put in from what the interest earned, so you can see compounding doing its work.

Use it for investmentsfixed depositsretirement projectionsgoal planning

The plain, predictable world of simple interest: I = P·r·t. Interest is earned only on the original principal, never on earlier interest — which is how most bonds, IOUs and informal loans work. It also estimates doubling time with the rule of 72.

Use it for bonds & IOUsshort-term lendingschool problemsquick estimates

Projects a savings balance from a starting amount plus a fixed monthly deposit at a given annual rate, compounded monthly. It shows total deposits versus interest earned, which is usually the moment people realize how much the habit matters.

Use it for emergency fundsdown paymentseducation fundshabit building

Runs money through time at a constant annual rate. It shows what today's price becomes after t years of inflation — and the mirror image, what today's money will still buy — plus how many years it takes for purchasing power to halve.

Use it for salary negotiationsretirement planninglong-term budgetsprice forecasting

Measures any investment in the only way that matters: (final − initial) ÷ initial. On top of the total ROI it computes the annualized (geometric) return and the growth multiple, so a 3-year gain and a 10-year gain become honestly comparable.

Use it for stocks & fundsreal estatebusiness projectsmarketing spend

The one number every product needs before launch: fixed costs ÷ (price − variable cost). It returns the units and revenue where costs and income meet, the contribution margin ratio, and how many units it takes to hit a target profit.

Use it for product launchespricing strategybusiness plansprofit targets