All calculators

Calculate your monthly mortgage payment, total interest, and full amortization schedule for any home loan.

Estimate monthly payments and total interest for any fixed-rate loan.

Estimate monthly payments on unsecured personal loans.

Calculate auto loan monthly payments and total interest.

See how long it takes to pay off credit card debt at a fixed monthly payment.

Plan your debt-free date using the snowball method — pay smallest balance first.

Pay off debt fastest by targeting the highest interest rate first.

See how investments grow over time with compound interest and regular contributions.

Calculate simple interest on a principal amount. Great for short-term loans, savings and quick finance homework.

See how your savings grow with regular deposits and interest.

Estimate whether you're on track to retire — see your nest egg at retirement age.

Estimate your 401k balance at retirement with employer match.

Project your IRA balance at retirement. Model contributions, growth and tax treatment for Traditional or Roth accounts.

Calculate annualized return on an investment. Compare investments held for different time periods on equal footing.

Calculate return on investment as a percentage. Compare gains against cost to judge project or investment performance.

Find how many units you need to sell to cover costs.

Calculate gross and net profit margin percentages.

Calculate selling price from cost and markup percentage.

Calculate sale price after applying a discount percentage.

Add or remove VAT (Value Added Tax) from a price. Compute gross, net and tax amounts for any VAT rate worldwide.

Add sales tax to a purchase price. Get final price with tax for any state, city or custom rate.

Rough estimate of federal income tax on gross income (US brackets, single filer, standard deduction).

Estimate capital gains tax on investments (US long-term, single filer).

Calculate dividend income and yield. Estimate annual payout, yield and reinvestment for stock holdings.

Calculate your net worth by subtracting liabilities from assets.

Calculate the emergency fund you need based on monthly expenses.

Convert between currencies using an approximate exchange rate.

See how inflation erodes purchasing power over time.

Calculate the future value of a lump sum at a given interest rate.

Calculate the present value of a future amount. Discount future cash flows to today's dollars for smarter decisions.

Estimate the USD cost of any Ethereum transaction from gas price (gwei), gas limit and ETH price.

Project staking income across ETH, SOL, ADA and other proof-of-stake assets using APR, compounding and price change.

See what a dollar-cost averaging plan would have returned — enter buy size, frequency and start date.

Calculate profit, fees and ROI on a crypto trade from buy price, sell price and position size.

Calculate Customer Acquisition Cost from marketing and sales spend.

Calculate Customer Lifetime Value. Project total revenue per customer to guide acquisition spend and retention.

Compare Lifetime Value to Customer Acquisition Cost.

Calculate conversion rate from visits and conversions.

Calculate click-through rate on ads or emails. Benchmark ad and email performance across campaigns and creatives.

Return on Ad Spend — revenue divided by ad cost. Judge campaign profitability by comparing revenue to ad spend.

Cost per thousand impressions. Compare display and video ad pricing across campaigns and networks.

Cost per click. Estimate ad spend per click and compare campaign efficiency across channels.

Cost per acquisition. Measure the true cost of gaining each new customer or conversion.

Calculate email open rate. Track campaign performance and benchmark against industry averages.

Calculate customer churn rate. Track monthly and annual churn to protect recurring revenue.

Calculate Monthly Recurring Revenue. Track subscription revenue and forecast SaaS growth month over month.

Calculate Annual Recurring Revenue. Annualize subscription revenue for board reporting and forecasting.

Calculate monthly burn rate. See how fast your startup spends cash and plan the next raise.

Calculate cash runway in months. Estimate months of cash left based on current burn and reserves.

Calculate gross margin percentage. Measure pricing power and unit economics for products or services.

Calculate operating margin. Measure core profitability from operations, before interest and taxes.

Calculate inventory turnover ratio. Gauge how efficiently stock converts to sales over a period.

Sales revenue needed to break even. Find the sales volume needed to cover fixed and variable costs.

Calculate sales commission. Compute earnings for tiered, flat, or split commission structures.

Quantify the revenue, wage and SLA cost of outages by minutes down, revenue rate and affected staff.

Find your true freelance hourly and day rate from target salary, expenses, taxes and billable hours.

See the true monthly, yearly and 5-year cost of a SaaS or subscription — with seats, price hikes and trial periods.

Estimate total project cost from labor hours, materials, overhead, contingency and profit margin.

Convert salary and target income to hourly, daily, weekly and monthly rates — with taxes and PTO.

Compute blended and paid CAC from marketing spend, sales headcount cost and new customers acquired.

Estimate customer lifetime value from ARPA, gross margin and monthly churn, with LTV:CAC comparison.

Convert between MRR and ARR, project growth, and see quick-ratio and net new MRR from movement inputs.

Compute customer and revenue churn, retention rate, and average customer lifetime from monthly numbers.

Estimate YouTube ad revenue from views, CPM, RPM and niche — plus sponsorship-equivalent income.

Model the return on an SEO investment from traffic, conversion rate, order value and content cost.

Calculate email campaign revenue and ROI from list size, deliverability, open rate, CTR and conversion.

Body Mass Index — weight-to-height ratio. Get category ranges and a quick health snapshot from height and weight.

Basal Metabolic Rate — calories burned at rest. Uses Mifflin-St Jeor for accurate resting calorie needs.

Total Daily Energy Expenditure. Combine BMR with activity level to plan cutting, bulking or maintenance.

Daily calorie needs from age, sex, weight, height, activity and goal (Mifflin-St Jeor).

Split calories into protein, carbs and fat. Balance protein, carbs and fats to match your training and goals.

Estimate body fat percentage from measurements (US Navy method).

Estimate fat-free body mass. Useful for tracking body composition and setting fitness goals.

Estimate ideal body weight from height. Free online tool with instant results, formulas and worked examples.

Daily recommended water intake. Personalize hydration goals by weight, climate and training load.

Daily protein target based on goal. Set daily protein for maintenance, muscle gain or fat loss.

Estimate delivery date from last menstrual period.

Estimate ovulation and fertile window. Estimate the fertile window based on cycle length and last period.

Calculate training heart rate zones. Find target zones for endurance, fat burn and interval training.

Estimate VO2 max from 1.5-mile run time. Gauge cardiovascular fitness from a simple 1.5-mile field test.

Running pace from distance and time. Free online tool with instant results, formulas and worked examples.

Estimate one-rep max from reps. Plan training percentages for strength programs from a submax set.

Estimate calories burned from steps. Convert daily steps into calories burned by weight and pace.

Best bedtimes for waking up refreshed. Plan bedtimes around 90-minute sleep cycles to feel rested.

Blood alcohol concentration estimate. Estimate impairment level from drinks, weight, sex and time.

Lifetime cost of smoking. See daily, monthly, yearly and lifetime spend to plan quitting.

Calculate percentages, percentage of, and percentage change.

Add, subtract, multiply and divide fractions. Simplifies to lowest terms and shows mixed-number results.

Free online scientific calculator with trig functions, logarithms, powers, roots and constants. No signup, instant results.

Solve ax² + bx + c = 0 for x. Get real or complex roots plus discriminant and vertex details.

Distance between two points in 2D. Uses the Euclidean formula for coordinate geometry problems.

Slope of a line between two points. Great for graphing, calculus prep and physics motion problems.

Area of common shapes. Circles, rectangles, triangles, trapezoids and more in one place.

Volume of common 3D shapes. Cubes, spheres, cylinders, cones and pyramids with clear formulas.

Find hypotenuse from two legs. Or solve for a missing leg given the hypotenuse and the other leg.

Sample standard deviation of a list of numbers. Measure spread with sample and population variants side by side.

Compute mean, median and mode of a list. Compare central tendencies to describe a dataset quickly.

Basic probability of independent events. Compute AND/OR outcomes and conditional probability with clear steps.

Number of ordered arrangements P(n,r). Count distinct orderings for lineups, passwords and schedules.

Number of unordered selections C(n,r). Handles binary and decimal units used by OSes and cloud vendors.

Weighted Grade Point Average. Supports unweighted and weighted scales for high school and college.

Exact age from birth date. Get years, months and days between a birth date and any target date.

Days between two dates. Get exact years, months, weeks, days, hours and minutes apart.

Business days between two dates. Excludes weekends and optional holidays for planning deadlines.

Duration between two times. Handles crossing midnight and returns hours, minutes and seconds.

Convert time between two time zones (UTC offsets).

Time remaining to a future date. Live countdown in days, hours, minutes and seconds to any date.

Work hours minus breaks. Log daily shifts with unpaid breaks to get accurate weekly totals.

Overtime pay after 40-hour threshold. Compute weekly gross pay with 1.5× or custom overtime rates.

Days from today to a date. Count down to birthdays, launches, deadlines and travel dates.

Check if a year is a leap year. Applies the full Gregorian rule with divisible-by-400 exceptions.

Convert word count into reading time for any audience — supports fast, average and technical reading speeds.

Format, validate and beautify JSON. Pretty-print, minify and spot syntax errors in API responses.

Encode text to Base64 and decode back. Handles Unicode and URL-safe variants for developers and QA.

Generate v4 UUIDs. Generate one or many random identifiers for databases and APIs.

Decode JWT tokens (header and payload). Inspect claims and expiry without sending tokens to any server.

Generate MD5 and SHA hashes. Compare checksums and verify data integrity right in the browser.

Convert Unix timestamp to date and vice versa. Free online tool with instant results, formulas and worked examples.

Test regular expressions with live matching. Debug patterns with capture groups, flags and instant highlighting.

Convert between HEX, RGB, HSL. Handy for designers matching brand colors across tools.

Calculate width or height for a given aspect ratio.

Generate a QR code for any text or URL. Great for links, WiFi, contact cards and offline sharing.

Generate strong random passwords. Choose length and character sets for accounts, keys and Wi‑Fi.

Estimate password entropy and crack time. See how long attackers would need at various guess rates.

Estimate file size from dimensions. Free online tool with instant results, formulas and worked examples.

Time to transfer a file at a given bandwidth. Plan uploads, backups and video delivery over any connection.

Convert between KB, MB, GB, TB. Handles binary and decimal units used by OSes and cloud vendors.

Estimate monthly AI API costs across OpenAI, Anthropic, Google and open models by tokens and request volume.

Calculate OpenAI API spend for GPT-4o, GPT-4o mini, GPT-4 Turbo, o1 and GPT-3.5 by tokens and request volume.

Convert token counts and per-million-token prices into dollar cost per request, per day and per month.

Estimate ChatGPT API costs for building a chatbot — includes conversation history, system prompts and monthly volume.

Estimate monthly GitHub Actions spend by runner OS, workflow minutes, jobs and included free tier.

Calculate monthly API spend by requests, cost per 1,000 calls, data transfer and free tier.

Compare monthly cloud VM costs across AWS, Azure and GCP with storage, egress and reserved-instance discounts.