Money math, body math, without the mess.

Monthly payment, total interest and a full payoff schedule for any personal, auto or student loan.

See exactly how long your balance will take to clear and how much interest it will cost.

Check your DTI ratio against the thresholds lenders actually use.

Monthly payment including taxes, insurance and PMI, plus an amortization schedule.

Find the home price you can afford based on income, debts and down payment.

See how much time and interest an extra monthly payment saves.

Compare your current loan to a refinance offer, with the closing-cost break-even point.

See how long it takes to reach your down payment savings goal.

A full month-by-month payment schedule for any loan.

Project how savings or investments grow with regular contributions and compounding.

Work out real profit or loss on a trade after fees, in any currency.

Interest calculated on principal only — no compounding.

What a future amount is worth today, at a given discount rate.

What a lump sum deposit grows to over time.

Arithmetic vs. geometric average return — and the volatility drag between them.

Total and annualized return on investment.

Solve for the rate that connects a starting and ending amount.

Solve for the discount rate where a cash-flow series breaks even.

How long until an investment's cash flows recoup the initial outlay.

Certificate of deposit maturity value and interest earned.

Bond price from coupon rate, yield and time to maturity.

What an expense ratio really costs over decades of growth.

How long it takes to reach a savings goal at a given deposit and rate.

Solve for future value, present value, or time — a general TVM calculator.

The monthly contribution needed to hit an investment target.

Simple vs. compound interest, compared side by side.

Add up everything you own and owe to see where you actually stand.

Convert hourly to annual pay, or gross to take-home, in a few seconds.

Estimate your US federal income tax using the official current-year IRS brackets.

Add tax to a price, or pull the pre-tax price out of a total, at any rate.

Project your retirement balance and estimated retirement income from today's savings rate.

Project your 401(k) balance including employer match, using 2026 IRS limits.

Project tax-free Roth IRA growth using 2026 IRS contribution limits.

Project tax-deferred Traditional IRA growth using 2026 IRS contribution limits.

Estimate your defined-benefit pension payout from years of service and salary.

Calculate your Required Minimum Distribution using the official IRS table.

Quick estimate of your benefit at 62, full retirement age, and 70.

Project annuity accumulation growth from deposits and rate of return.

Calculate a fixed monthly payout that exhausts a balance over a set period.

Car loan payment including trade-in value and sales tax.

Compare a cash-back rebate against a low-interest offer to see which costs less.

Car lease payment using the standard depreciation and finance fee formula.

Convert between major currencies using live ECB reference rates.

Compare buying power between any two years since 1913 using official BLS data.

Find the monthly payment, or the loan amount a target payment supports.

How issuers calculate your monthly interest charge.

Snowball vs. avalanche, compared on your real numbers.

Current debts vs. one new consolidation loan, side by side.

Months to repay a balance at any fixed payment you choose.

Student loan payment including grace period interest capitalization.

Future college costs projected forward with tuition inflation.

Add or remove VAT at any rate, with common country presets.

Straight-line and double-declining balance depreciation schedules.

Margin and markup from cost and price, plus a reverse price solver.

Final price after a discount, or two stacked discounts.

Total cost of leasing versus buying, over the same time period.

Your spending breakdown against the 50/30/20 guideline.

Commission from a sale, including tiered rate structures.

Monthly payment and total interest for a business loan.

Monthly payment and total interest for a personal loan.

Monthly payment and total interest for a boat loan.

Body Mass Index from your height and weight, with the WHO category it falls into.

Estimate body fat percentage from tape-measure circumferences using the US Navy method.

A healthy weight range from four well-known medical formulas, side by side.

The current 2023 Army one-site tape-test body fat formula.

Estimate lean mass from height and weight using the Boer formula.

The healthy weight range for your height.

Estimate frame size using wrist-to-height ratio.

Daily calorie needs for maintaining, losing or gaining weight, based on the Mifflin-St Jeor equation.

Resting calorie burn compared across three standard formulas.

Total daily calorie burn including activity.

Estimate calories burned for 20+ common activities.

Solve for pace, time, or distance — fill in any two.

Estimate 1RM from any recent set, with a percentage training table.

Personalized heart rate training zones using the Karvonen method.

Daily protein, carb and fat targets from your calorie goal.

Protein target by bodyweight and goal.

Recommended daily carb range from your calorie target.

Recommended daily fat range from your calorie target.

How far along you are, your trimester, and due date.

Estimated due date from LMP or conception date.

Recommended pregnancy weight gain range by pre-pregnancy BMI.

Estimate conception date from LMP and cycle length.

Estimate conception date backward from a due or birth date.

Estimate your fertile window for trying to conceive.

Predict upcoming period dates from your cycle length.

eGFR using the current 2021 CKD-EPI race-free equation.

BSA in m² using the Mosteller formula.

An educational BAC estimate using the Widmark formula.