Calculators

Monthly payment, total interest and payoff curve from amount, rate and term.

Payments for a personal installment loan.

Repayment plan for student loans.

Payments and cost of a business loan.

Full amortization schedule with extra payments.

Find the term when you know the payment.

Payments and interest for a boat loan.

Your DTI in one number.

True cost of a loan including fees.

Price, trade-in, tax and term → monthly payment.

Monthly lease payment and total lease cost.

Monthly principal & interest with taxes, insurance, HOA and PMI shown separately.

Extra payments to own your home sooner.

What home price fits your income?

Down payment amount, percent and LTV.

Equity, LTV and usable equity.

Is refinancing worth it?

Growth of savings with compounding and contributions.

What your monthly savings plan will be worth.

Interest computed only on the principal.

What things will cost in the future.

Solve for the rate that connects two amounts.

Certificate of deposit growth.

How long to clear a card balance.

Payoff timeline with new purchases included.

Payoff plan for a single debt.

Compare a consolidation loan with current debts.

How much rent can you afford?

Cash flow, cap rate and ROI on a rental.

What a future amount is worth today.

Growth of a lump sum or payments.

Return on investment including time.

How long until an investment pays for itself.

Arithmetic and geometric average of returns.

Convert a lump sum into income (or back).

Project savings, income needs, withdrawal longevity and scenarios.

Convert hourly, weekly, monthly and annual pay.

Net pay after tax and deductions.

Discount your cash flows and see the verdict — worth it or not.

Body Mass Index from weight and height.

Classic ideal-body-weight estimates.

Daily calorie needs with goal targets and kJ/kcal output.

Resting calorie burn (basal metabolic rate).

Total daily energy expenditure.

Calories burned during exercise (MET).

Daily protein, carbs and fat in grams.

Daily protein needs for your goal.

Body fat % from tape measurements (US Navy).

Estimate muscle and organ mass (Boer).

BSA from height and weight (Mosteller).

Estimate your 1RM from a set.

Heart-rate training zones (Karvonen).

Estimated due date from LMP or conception.

When did conception most likely happen?

Fertile window and next period.

Running pace from distance and time.

Estimate blood alcohol concentration.

Estimated glomerular filtration rate (CKD-EPI).

X% of Y, X as a percent of Y, percentage change and percentage difference.

Compare an observed value with an exact value.

Mean of a list of numbers plus sum and count.

Descriptive statistics for a data set.

σ and variance for a sample or population.

Standardize a value and read its probability.

CI for a proportion or a sample mean.

How many responses do you need?

One- and two-tailed p-values from a z-score.

Slope, intercept, r and r² — with the scatter and fit line, live.

Round to a decimal place or to significant figures.

Convert between decimal and scientific notation.

Convert numbers between any bases 2–36.

Exact arithmetic for arbitrarily large integers.

Count ordered arrangements (nPr) and unordered selections (nCr).

Single-event and two-independent-event probability.

Expressions, trig, logs and factorials — live, with history.

Add, subtract, multiply and divide fractions.

Simplify, scale and solve ratios.

Evaluate powers with real exponents.

Square, cube and nth roots.

Logarithms in any base.

Solve ax² + bx + c = 0.

Slope, intercept and line equation from two points.

Distance and midpoint between two points.

Detect the pattern and predict the next terms.

Radioactive decay and half-life problems.

Radius, diameter, circumference and area of a circle.

a² + b² = c² for right triangles.

Solve right triangles from two known values.

Solve any triangle from SSS, SAS or ASA.

Area of rectangles, triangles, circles and more.

Volume of boxes, spheres, cylinders, cones and more.

Surface area of common 3D solids.

All six functions for any angle — on the unit circle, live.

GCF / GCD of two or more numbers.

LCM of two or more numbers.

Find every factor pair of an integer.

Break any integer into its prime factors.

Exact age in years, months and days.

Time between two dates.

Add or subtract days, weeks, months and years.

Days until a date or between dates.

Duration between two clock times.

Tip amount, total and per-person split.

Sale price after a percentage discount.

Add or remove sales tax.

Add or remove value-added tax.

Fuel economy from distance and fuel used.

Trip fuel cost and per-mile cost.

Running cost of any appliance.

Heating/cooling capacity for a room.

Feels-like temperature in wind.

Feels-like temperature in heat.

Dew point from temperature and humidity.

Area of a room or property.

Slab, wall, column, round-slab and stair concrete estimates.

Roof area and material in squares.

How many tiles do you need?

Bulk mulch or gravel volume and weight.

How much material do you need to fill an area?

Term GPA, cumulative GPA and planning with credits.

Weighted grade and what you need on the final.