Finance Calculators

Determines the exact contribution needed to capture your full employer 401(k) match and estimates your net cost today plus long-term retirement projection.

Calculate the minimum bill rate needed to cover labor, overhead, and margin goals so your agency is profitable — not just busy.

Estimates net profit per unit after all Amazon FBA costs and flags whether a deal is worth buying.

Estimate your MRR, ARR, customer count, LTV, and growth projections based on traffic, conversion, and churn assumptions.

Score and rank side-hustle ideas against your real constraints — time, budget, skills, and risk tolerance.

Calculate how many units and how many months it takes to break even based on your fixed costs, variable costs, and pricing.

Calculates the maximum you can spend on customer acquisition before your campaign stops being profitable.

Compare buying an existing online business vs building from scratch to find your breakeven point and best ROI.

Estimates your safe monthly car payment and maximum vehicle budget based on income, debts, down payment, and loan terms.

Compare the total cost of repairing your current car against replacing it with a financed vehicle over your chosen time horizon.

Computes total cost-to-own for cash purchase, financing, and leasing to reveal which option saves you the most money.

Map cofounder roles, time commitment, risk tolerance, and contribution type to a recommended equity range and decision-rights structure.

Estimates whether using a credit card and paying it off immediately beats debit or cash, after accounting for rewards and annual fees.

Find the smartest way to allocate extra cash across your credit cards to minimize total interest and pay off debt faster.

Find out if your rewards credit card beats the annual fee and which redemption strategy earns you the most value.

Score your credit card setup against your spending habits and travel style to find the biggest gap holding back your points game.

Compare the Avalanche and Snowball debt payoff strategies to see which saves more interest and pays off your debts fastest.

Estimates the net financial ROI of returning to school by modeling tuition, lost wages, and expected salary uplift against the opportunity cost of staying in the workforce.

See exactly how your down payment affects monthly payments, total interest, and lifetime mortgage cost — so you know if a bigger upfront payment is truly worth it.

Recommends an optimal down payment amount by balancing PMI elimination, interest savings, and cash-on-hand safety.

Simulates inflation-aware retirement withdrawals to estimate the probability your portfolio survives your chosen horizon.

Estimates a defensible founder salary range based on business revenue, margin, and cash constraints across multiple payout policies.

Model whether hiring a manager to run your franchise will remain profitable under different cost and performance scenarios.

Stress-tests your home budget under rate shocks, income dips, and cost surprises to find the safe maximum purchase price you can truly afford.

Projects how long your inventory and cash will last based on sales velocity and weekly burn rate.

Estimate how much a Junior SIPP could be worth at retirement in both nominal and today's money terms.

Compare the true total cost of leasing versus buying a car over your ownership horizon to find which option saves you money.

Find the minimum salary you need to live comfortably in your area based on housing, savings, debt, and local cost of living.

Compare the real cost of forming an LLC versus staying a sole proprietor — and find out if it's worth it for your side hustle.

Compare monthly payments and total interest across loan terms to find where extending your loan stops being worth it.

Calculate exactly when refinancing pays off and whether it's worth it before your planned move-out or payoff date.

Reveals the true out-the-door cost of a vehicle deal and exposes whether a low monthly payment is hiding an expensive loan.

Evaluate whether a pay raise or job offer is truly worth it after taxes, commuting costs, benefit changes, and time tradeoffs.

Estimates the maximum you should pay for a pre-purchase inspection based on purchase price, repair risk, and negotiation leverage.

Estimates a realistic project cost band by combining room type, scope level, size, and quality tier.

Calculate the maximum safe offer price for a used vehicle after accounting for repairs, taxes, fees, and expected resale value.

Estimates how many years until buying a home becomes cheaper than renting, accounting for opportunity cost, taxes, maintenance, and selling costs.

Decides whether repairing or replacing an item is the smarter financial move based on cost, remaining life, and failure risk.

Find the break-even retirement tax rate where Roth and Traditional 401(k) contributions produce identical lifetime tax costs.

Estimates cash runway under different burn rates and revenue ramp assumptions to help founders decide how much funding to raise.

Calculate the hourly net profit of any side hustle to find out which pays best for the time you have.

Calculate the ideal tip amount by balancing service quality, generosity, and your personal financial comfort.

Estimates total launch cost, monthly operating cost, and how many months it will take to recover your initial investment.

Forecasts your expected annual Tesla maintenance spend across tires, brakes, and routine service based on your driving habits.

Compare the real cost of paying a toll versus taking a longer free route by putting a dollar value on your time.

Compare the true cost of two cars side-by-side across financing, fuel, insurance, maintenance, and depreciation.

Compare your dealer trade-in offer against selling privately after taxes, fees, and the cost of your time.

Estimate how much tuition reimbursement you'd owe if you left your job early, based on your contract terms and planned leave date.

Estimate the Stamp Duty Land Tax (SDLT) you'll pay on a UK property purchase in England or Northern Ireland.

Score the risk of a used-car history report and get negotiation guidance based on accidents, damage, title markers, and mileage consistency.

Estimates whether you should buy now or wait for a better price, balancing expected savings against urgency and sellout risk.

Estimate how much of your startup you own after YC funding and any subsequent raise.