Free online calculators

Estimate monthly loan payments, total interest, and total repayment.

Estimate how long it may take to reach a savings goal.

Estimate investment growth with compounding and contributions.

Add or extract VAT from a price and see net, tax, and gross totals.

Calculate percentages, increases, decreases, and simple percentage totals.

Calculate gross profit, margin percentage, and markup from revenue and cost.

Estimate how many units you need to sell to cover fixed costs.

Estimate the hourly rate needed to hit an annual income target.

Calculate return on ad spend from revenue and advertising cost.

Calculate cost per click, cost per thousand impressions, and click-through rate.

Estimate monthly website ad revenue from pageviews, RPM, and fill rate.

Estimate monthly website hosting costs from plan, traffic, storage, backups, and support.

Estimate VRAM and RAM needs for running local AI models.

Estimate raw and compressed image file sizes from dimensions and color depth.

Estimate body mass index from height and weight.

Estimate daily calorie deficit and weekly weight-change pace.

Estimate trip cost, daily budget, and per-person travel cost.

Estimate monthly and annual cost of owning a car.

Estimate affordable rent based on income, debts, and target rent ratio.

Simplify aspect ratios and calculate matching dimensions.

Estimate updated GPA from current credits and a new course grade.

Calculate tip, tax, total bill, and split cost per person.

Estimate mortgage principal, interest, taxes, insurance, and HOA payments.

Estimate take-home pay from salary, effective tax rate, deductions, and pay frequency.

Estimate future cost and purchasing power after inflation.

Calculate return on investment, net gain, and payback multiple.

Estimate AI API token costs from input tokens, output tokens, and request volume.

Estimate monthly cloud storage, backup, and egress costs.

Estimate basal metabolic rate and daily energy needs.

Estimate concrete volume, cubic yards, and bag quantities with waste.

Estimate gallons of paint needed from area, coats, coverage, and waste.

Estimate crypto profit, ROI, fees, and break-even price.

Estimate dollar-cost averaging position value, coins accumulated, and profit.

Estimate the final exam score needed to reach a target course grade.

Estimate how long it may take to pay off debt and how much interest you could pay.

Estimate a practical emergency fund target and how long it may take to save it.

Add assets and debts to estimate your current net worth.

Estimate future retirement savings from current balance, contributions, return, and target.

Estimate investment growth after contributions, fees, and inflation.

Estimate annual and monthly dividend income from portfolio value and dividend yield.

Estimate credit card payoff time and interest from APR, payment, and monthly charges.

Convert APR to APY and compare how compounding changes the effective annual rate.

Estimate car loan payments after down payment, trade-in, tax, fees, rate, and term.

Estimate your debt-to-income ratio from monthly income and debt payments.

Estimate down payment, closing costs, shortfall, and savings timeline for a home purchase.

Estimate monthly surplus, savings rate, and spending breakdown from income and expenses.

Calculate selling price, markup, gross profit, and margin from cost.

Add or reverse sales tax to estimate subtotal, tax, and total.

Calculate customer acquisition cost from sales, marketing, and new customers.

Estimate customer lifetime value from revenue, gross margin, and churn.

Calculate conversion rate, revenue per visitor, and conversions needed.

Estimate MRR, ARR, churn impact, and next-month subscription revenue.

Calculate customer churn rate, retention rate, and ending customers.

Estimate API request costs from request volume, token usage, and per-million pricing.

Estimate GPU electricity usage and cost from wattage, hours, days, and power price.

Estimate video file size from bitrate, duration, audio, and overhead.

Estimate streaming bandwidth from viewers, bitrate, watch time, and days.

Convert uptime percentage into allowed downtime over a period.

Estimate backup storage from source data, daily change rate, retention, and compression.

Estimate daily water intake from body weight, exercise, and climate.

Estimate daily protein intake from body weight and fitness goal.

Estimate body fat percentage using the US Navy circumference method.

Calculate pace, speed, and estimated finish times from distance and time.

Estimate tiles, boxes, waste, and material cost for a floor or wall.

Estimate flooring area, boxes, waste, and material cost.

Estimate gravel volume and tons from length, width, depth, and density.

Estimate fuel cost from distance, fuel economy, fuel price, and trips.

Estimate monthly commute cost from distance, fuel, parking, tolls, and workdays.

Estimate electricity cost from watts, usage time, days, and price per kWh.

Estimate monthly, annual, and multi-year subscription costs with price increases.

Estimate total study hours, daily targets, and review time before a deadline.

Calculate a weighted course grade from category scores and weights.

Calculate a simple average grade across assignments, quizzes, or tests.

Estimate how long reading will take from word count and reading speed.

Plan remaining study hours, sessions, and daily load before an exam date.

Count words, characters, sentences, and estimated reading time from pasted text.

Count characters, characters without spaces, lines, and UTF-8 bytes.

Calculate reading speed in words per minute and estimate time for a target word count.

Calculate screen or image pixel density from resolution and diagonal size.

Generate a CSS clamp() expression from min and max size and viewport widths.

Estimate Base64 encoded length, padding, and size overhead from text or payload bytes.

Estimate JSON byte size, minified size, and parse validity from pasted JSON.

Estimate download time from file size, connection speed, and overhead.

Estimate weekly, monthly, and yearly running cost for a household appliance.

Estimate weekly, monthly, and yearly coffee spending and potential home-brew savings.

Estimate monthly, yearly, and multi-year smoking costs from packs and prices.

Calculate cost per serving or meal from ingredients, overhead, and servings.

Estimate monthly grocery budget, per-person cost, and buffer from weekly spending.

Calculate time difference and destination time from UTC offsets.

Convert a travel budget into destination currency with card or exchange fees.

Estimate packed luggage weight and remaining allowance before a trip.

Estimate PTO days needed for a trip after weekends, holidays, and buffer days.

Split hotel cost by person from nightly rate, nights, taxes, fees, rooms, and guests.

Estimate trading, spread, network, and withdrawal fees for a crypto transaction.

Estimate the sell price needed to break even after crypto fees.

Estimate crypto position size from account size, risk percentage, entry, and stop price.

Estimate the crypto exit price needed to reach a target net profit after fees.

Estimate taxable crypto gain and possible tax from proceeds, cost basis, fees, and tax rate.