Free Calculator Tools

Calculate TikTok engagement rate, like rate, comment rate, and share rate from your video stats.

Estimate staking rewards with compounding, validator fees, and multiple time periods for any crypto token.

Calculate return on investment, ROAS, CPM, CPC, and engagement metrics for influencer marketing campaigns.

Calculate required margin, pip value, and position size for forex trades with customizable leverage.

Estimate your annual carbon footprint from driving, flights, electricity, gas, and diet, and calculate the cost to offset it.

Calculate your cryptocurrency trading profit or loss, ROI, fees paid, and breakeven price.

Estimate your take-home pay after federal tax, state tax, and FICA deductions for any pay frequency.

Compare the total cost of renting versus buying a home over time, including taxes, appreciation, and opportunity cost.

Plan your debt-free journey using avalanche or snowball strategy with extra payment optimization.

Free online scientific calculator with trigonometry, logarithms, powers, factorials, and calculation history.

Add, subtract, multiply, and divide fractions and mixed numbers with step-by-step solutions.

Perform matrix operations including addition, subtraction, multiplication, determinant, inverse, and transpose.

Calculate your weekly work hours and pay with clock-in/out times, break deductions, and overtime tracking.

Convert between Bitcoin (BTC), satoshis, mBTC, and USD. Fetch live prices or enter custom values.

Calculate your ideal freelance hourly rate based on desired income, expenses, taxes, and billable hours.

Calculate Compound Annual Growth Rate with year-by-year breakdown and total return metrics.

Perform arithmetic and bitwise operations on binary, decimal, octal, and hexadecimal numbers.

Calculate monthly savings needed to reach your goal, with interest projections and growth timeline.

Calculate IPv4 subnet details including network, broadcast, host range, and binary breakdown.

Plan your wedding budget with category breakdowns, per-guest costs, and a custom spending tracker.

Calculate PPI/DPI, dot pitch, total pixels, and physical dimensions for any screen resolution and size.

Calculate daily protein, carbs, and fat targets based on your stats, activity level, and fitness goals.

Estimate body fat percentage using the U.S. Navy method with waist, neck, and hip measurements.

Plan retirement savings with compound growth projections, the 4% rule, and gap analysis.

Estimate US federal income tax with 2025 brackets, standard deduction, and bracket breakdown.

Calculate your daily water intake based on weight, activity level, and climate with a drinking schedule.

Estimate your blood alcohol content using the Widmark formula based on drinks, weight, gender, and time.

Calculate your love compatibility score with your partner using a fun name-based algorithm.

Calculate your Life Path, Expression, Soul Urge, and Personality numbers from your name and birth date.

Compare electric vehicle vs gas car costs over time. Calculate fuel savings, cost per mile, and total ownership cost.

Calculate your Total Daily Energy Expenditure based on age, gender, weight, height, and activity level using the Mifflin-St Jeor equation.

Calculate running pace, time, or distance. Includes presets for 5K, 10K, half marathon, and marathon with split times.

Solve ax² + bx + c = 0. Get real or complex roots, discriminant, vertex, axis of symmetry, step-by-step solution, and graph.

Estimate your fertile window and ovulation date based on menstrual cycle length. Includes 3-cycle forecast and timeline.

Generate fluid CSS clamp() values for responsive typography and spacing. Set min/max viewport and values with live preview.

Calculate stock trading profit or loss including commissions, fees, and capital gains tax. See total return and break-even price.

Estimate your one-rep max (1RM) using 7 proven formulas. Get percentage-based training loads for any lift.

Calculate your DTI ratio to assess financial health and mortgage eligibility. See your rating on the lender scale.

Calculate gross, operating, and net profit margins. Enter revenue and costs to see margins, markup, and visual breakdown.

Split a restaurant bill among friends. Add tip percentage, tax, and see what each person owes with tip comparison.

Calculate mean, variance, standard deviation, median, mode, and range. Supports population and sample calculations with steps.

Estimate your due date, gestational age, trimester, conception date, and pregnancy progress from your LMP.

See how inflation changes future buying power with year-by-year projections and a visual purchasing power chart.

Estimate monthly mortgage costs, total interest, total cost, escrow add-ons, and first-year amortization while comparing 15-year and 30-year loans.

Use the classic four-card percentage calculator for percentage-of, reverse percentage, and change calculations.

Solve percentage-of, reverse percentage, and percent change problems instantly with quick-pick shortcuts.

Calculate body mass index in metric or imperial units with the original classic layout.

Calculate exact age, total days lived, next birthday countdown, zodiac details, and more from a birth date.

Calculate tip amount, total bill, and per-person totals with quick 10, 15, 18, 20, and 25 percent presets.

Find sale prices after one or more stacked discounts, calculate total savings, and optionally apply sales tax.

Enter width and height to simplify a ratio, then use presets or one known dimension to calculate the other side.

Convert Unix file permissions between numeric and symbolic forms while generating a ready-to-copy chmod command.

Calculate DeepSeek API costs for V4-Flash and V4-Pro models. Includes cache hit/miss pricing, thinking mode, and current promotional discounts.

Compare API pricing across GPT-5.5, Claude Opus 4.7, Gemini 3.5 Flash, Qwen 3.7, Composer 2.5, and DeepSeek V4. Calculate costs for any usage level.

Calculate your GPA on 4.0, 4.3, or 5.0 scales. Add courses with grades and credits to see cumulative GPA and Latin honors classification.

Calculate your weighted course grade with custom assignment weights. Find out what score you need on remaining work to hit your target.

Estimate monthly loan payments, total interest, amortization, and a principal-versus-interest breakdown.

Track your monthly budget with income and expense items. See totals, balance, and category breakdown at a glance.

Calculate compound interest with customizable principal, rate, time, and compounding frequency. View year-by-year growth breakdown.

Convert between annual, monthly, biweekly, weekly, and hourly salary. Estimate taxes and take-home pay with simplified federal brackets.

Convert between electrical units and use Ohm's law calculator. Calculate volts, amps, watts, ohms, and kilowatt-hours with formula reference.

Advanced Roman numeral converter with batch mode and arithmetic. Convert multiple numbers, add and subtract Roman numerals. Full conversion table included.

Estimate total fuel needed and trip cost using distance, fuel efficiency, and fuel price in metric or imperial units.