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Finance Calculators

22 tools

Mortgage Calculator

Monthly payments, total interest and full amortization breakdown.

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Investment & Compound Interest

See how your money grows with compound interest over time.

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Salary & Tax Calculator

Estimate take-home pay after tax, NI and pension deductions.

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Car Payment Calculator

Monthly payments, total cost of ownership and depreciation.

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Loan Payoff Calculator

Find your debt-free date and see how much interest you'll save.

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Real Estate ROI

Rental yield, cap rate and return on investment for properties.

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Inflation Calculator

Calculate how inflation affects purchasing power over time.

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Freelance Hourly Rate

Calculate your target freelance rate based on costs and desired salary.

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Retirement Calculator

Project your retirement savings and monthly income at retirement age.

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Break-Even Calculator

Find break-even point in units and revenue for any product.

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Calculate Return on Investment for any project or campaign.

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VAT / GST Calculator

Add or remove VAT/GST from any price instantly. UK standard 20%.

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Paycheck Calculator

UK net pay after income tax, National Insurance and pension.

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Budget Calculator

50/30/20 rule budget planner based on your monthly income.

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Net Worth Calculator

Calculate total net worth from all your assets minus liabilities.

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Credit Card Payoff

How long to pay off your credit card and total interest paid.

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Dividend Calculator

Calculate dividend yield, annual income and portfolio value.

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FIRE Calculator

Your Financial Independence number and years to retire early.

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Emergency Fund Calculator

Calculate your ideal emergency fund size based on expenses.

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College Savings Calculator

Monthly saving needed to cover university tuition costs.

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Stock Return Calculator

Total return on stocks including dividends and price appreciation.

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Exchange Fee Calculator

Compare bank vs Wise vs bureau rates to find the true cost.

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💪

Health Calculators

17 tools

Body Mass Index, ideal weight range and body fat estimation.

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Calorie & TDEE Calculator

Total Daily Energy Expenditure, BMR, and calorie goals.

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Pregnancy Due Date

Calculate due date, trimester milestones and week countdown.

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Sleep Calculator

Best bedtimes and wake-up times based on 90-minute sleep cycles.

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Macro & Nutrition

Daily target macronutrient splits for your fitness goals.

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Body Fat Calculator

Estimate body fat % using the US Navy tape measurement method.

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Ideal Weight Calculator

Ideal body weight using Robinson, Miller and Devine formulas.

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Water Intake Calculator

Recommended daily water intake based on weight and activity.

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Protein Calculator

Daily protein recommendation based on weight and fitness goals.

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Estimate Blood Alcohol Content from drinks, weight and time.

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Ovulation Calculator

Find your fertile window and ovulation date from last period.

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Period Calculator

Predict your next period date and track your menstrual cycle.

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IVF Due Date Calculator

Calculate IVF due date from egg retrieval or embryo transfer date.

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Waist-to-Hip Ratio

WHR and cardiovascular health risk category.

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Cholesterol Ratio Calculator

LDL/HDL cholesterol ratio and cardiovascular risk assessment.

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Alcohol Calories Calculator

Calories in beer, wine, spirits and cocktails by serving size.

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Calories in Food

Look up and sum calories from common foods to calculate your meal total.

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Fitness Calculators

9 tools

Pace Calculator

Running pace, finish time, or distance for any race from 5K to marathon.

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Calorie Burn Calculator

Calories burned during exercise by activity, duration and weight.

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Heart Rate Calculator

Max heart rate and target training zones for optimal workouts.

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Walking Calorie Calculator

Calories burned walking by weight, distance and speed.

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Swimming Calorie Calculator

Calories burned swimming by stroke, weight and duration.

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Cycling Calculator

Cycling speed, distance, time and calories burned on any ride.

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One-rep max for any lift and percentage-based training weights.

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Bench Press Calculator

Bench press 1RM and training weight percentages.

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Deadlift Calculator

Deadlift 1RM and percentage-based training weights.

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🧮

Math & Science Calculators

10 tools

Scientific Calculator

Trig, logarithms, exponents, factorials and advanced functions.

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Percentage Calculator

Find percentages, percentage change and what percent X is of Y.

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Triangle Calculator

Area, perimeter, angles and sides of any triangle.

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Fraction Calculator

Add, subtract, multiply and divide fractions with simplification.

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Quadratic Equation Solver

Solve ax²+bx+c=0 and get both roots with full working.

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Speed Distance Time

Calculate speed, distance or time from any two known values.

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Half-Life Calculator

Calculate radioactive decay and drug half-life over time.

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Energy Unit Converter

Convert between kWh, joules, BTU, calories and watt-hours.

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Aspect Ratio Calculator

Calculate and maintain aspect ratios for images and video.

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Basic Calculator

Standard arithmetic: add, subtract, multiply, divide, percentages.

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🔧

Everyday Utility Calculators

13 tools

Calculate exact age in years, months and days from date of birth.

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Currency Converter

Convert between 20+ major world currencies instantly.

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Discount Calculator

Sale price, savings amount and percentage off any item.

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Electricity Cost Calculator

Cost to run any appliance based on wattage and usage hours.

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Date & Time Planner

Measure exact days/weeks between dates or calculate milestones.

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Tip & Bill Splitter

Calculate tip amounts and split bills between any number of people.

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Gas & Fuel Cost

Estimate fuel cost for any trip based on distance, MPG and price.

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Convert temperature, weight, length, volume and speed instantly.

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Time Calculator

Add or subtract time durations and convert between time units.

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Random Number Generator

Generate random numbers in a custom range — single or lists.

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Reading Speed Calculator

Words per minute and time to finish any book or document.

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Screen Time Calculator

Hours and years spent on phone, TV and social media.

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Wedding Budget Calculator

Wedding budget planner with suggested category allocations.

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🏗️

Construction & Home Calculators

7 tools

Concrete Calculator

m³ and bags of concrete needed for any slab or footing.

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Paint Calculator

Litres of paint needed for any room based on wall dimensions.

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Floor Tile Calculator

Number of tiles needed for any floor or wall area.

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Room Area Calculator

Room area in m² or ft² — perfect for flooring and carpet quotes.

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Fence Calculator

Fence panels, posts and materials for any garden perimeter.

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Roof Area Calculator

Roof surface area for tiles, felt and materials estimation.

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Mulch & Soil Calculator

Mulch or topsoil needed for any garden bed or border.

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🤖

Tech & Crypto Calculators

6 tools

AI Token Cost Calculator

Estimate monthly API costs for OpenAI, Claude, Gemini and more.

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Crypto Profit / Loss

Calculate profit, loss, ROI and break-even for any crypto trade.

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Crypto Staking Rewards

Project staking income based on APY, amount and compounding.

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SaaS LTV & Churn

Customer Lifetime Value, churn rate and LTV:CAC ratios.

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Options Profit Calculator

P&L, break-even and risk for call and put options trades.

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Password Generator

Generate strong, secure passwords of custom length and complexity.

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🌿

Ecology Calculators

2 tools

Carbon Footprint Calculator

Estimate your annual carbon footprint from flights, diet and energy.

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Solar Panel Calculator

Panels needed and ROI for a home solar installation.

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🎯

Fun & Lifestyle Calculators

14 tools

Compatibility Calculator

Discover your compatibility score. Share with someone special!

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Love Calculator

Fun love compatibility percentage from two names and star signs.

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Lucky Number Calculator

Your lucky number using numerology from name and birth date.

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IQ Score Percentile

Convert any IQ score to its population percentile rank.

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Dog Age Calculator

Convert dog years to human years by breed size accurately.

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Cat Age Calculator

Convert cat years to human years — the real formula.

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Grade Point Average from course grades and credit hours.

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Grade Calculator

Grade you need on your final exam to achieve your target.

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Bra Size Calculator

Bra size from bust and underbust measurements (UK/EU/US).

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Nursing Bra Size Calculator

Right nursing bra size for pregnancy and breastfeeding.

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Ring Size Calculator

Convert ring circumference to US, UK and EU ring sizes.

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Shoe Size Converter

Convert shoe sizes between UK, US, EU and Asian sizing.

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Army Body Fat Calculator

US Army body fat % using official tape measurement method.

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Roth IRA Calculator

Tax-free Roth IRA growth and retirement income projection.

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100 Free Online Calculators for Every Need

FreeToolsForNow offers 100 free, accurate calculators covering personal finance, health metrics, fitness, mathematics, cryptocurrency, ecology and more. Whether you're calculating a mortgage payment, tracking fitness goals, planning for retirement, or estimating your carbon footprint, our tools deliver instant, reliable answers.

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100% Free — All 100 calculators are completely free to use, forever.
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100 Calculators — Finance, health, fitness, math, science, construction and more.