Calculators
Money, health, dates, math and everyday numbers — answered in seconds. · 253 tools
Every calculator on CalcBrew runs in your browser, shows its working, and is built around a real question: how much will this loan cost, how many calories do I burn, how many days until a date, how much paint do I need. Pick a topic below or search by name.
Results appear as you type, and each page explains the formula behind the number so you can sanity-check it. Where a calculation depends on rules that change (tax rates, allowances), the page states which year it uses.
Mortgages, loans, savings, investing and budgeting.
Betting CalculatorPopularProfit, odds converter, bookmaker margin and value bet — all in one.Compound InterestPopularCompound interest — calculate investment or savings growth yearly.Mortgage CalculatorPopularMonthly payment, interest and total cost. Annuity and equal principal.Savings CalculatorPopularTrack savings growth with monthly deposits and compound interest.VAT CalculatorPopularAdd or remove Finnish VAT. All rates: 25.5%, 13.5%, 10%.50/30/20 Budget CalculatorSplit your net income by the 50/30/20 rule: 50% needs, 30% wants, 20% savings and debt …
Net pay, hourly rates, allowances and tax deductions.
Net Salary CalculatorPopularTake-home pay after Finnish taxes — TyEL, municipal & state tax.Unemployment BenefitPopularEstimate earnings-related allowance from your salary. Base + earnings component.Commuting DeductionTravel expense deduction 2026 — excess €900, max €7 000.Gross Salary CalculatorFind the gross salary needed for your desired net pay.Hourly Wage CalculatorConvert monthly salary to hourly wage and back.Household DeductionTax deduction for cleaning, renovation or care services. Max €1,600.
Working hours, overtime, vacation days and holiday pay.
Vacation Days CalculatorPopularCalculate vacation days consumed under the Finnish Annual Holidays Act.Business Days CalculatorWorking days between dates — excludes Finnish public holidays.Holiday Pay CalculatorCalculate holiday pay and vacation bonus from monthly salary.Overtime CalculatorCalculate overtime pay +50% / +100% under the Working Hours Act.Vacation AccrualCalculate how many vacation days you accrue under the Finnish Annual Holidays Act: 2 or 2Vacation OptimizerFind the best bridge-day combinations for your vacation.
BMI, calories, macros, sleep and body measurements.
BMI CalculatorPopularCalculate BMI and ideal weight. Colour-coded classification.Calorie CalculatorPopularDaily calorie needs (TDEE) and basal metabolic rate (BMR).TDEE CalculatorPopularFree TDEE calculator: find your total daily energy expenditure with the Mifflin-St Jeor equationAlcohol CalculatorCalculate weekly alcohol units and annual cost.Army Body Fat CalculatorFree Army body fat calculator using the classic AR 600-9 tape test formulasBaby Sleep Calculator — Sleep Needs by AgeCalculate how much sleep a baby or child needs by age.
Pace, heart-rate zones, training loads and race predictions.
Barbell Plate CalculatorCalculate how much plate weight to load on each side of the bar to reach your target to…Cycling CalculatorCalories, travel time, CO₂ savings and money saved vs car.Exercise Calorie CalculatorCalories burned in 30+ sports: running, cycling, swimming, gym.Golf Handicap CalculatorCalculate WHS Handicap Index from your rounds. Course Rating and Slope.One Rep Max CalculatorCalculate 1RM for bench press, squat and deadlift.Power-to-Weight CalculatorCalculate your power-to-weight ratio in watts per kilogram (W/kg) — a key cycling perfo…
Percentages, fractions, geometry, algebra and statistics.
Percentage CalculatorPopularPercentage of a number, percentage change, increase and decrease.Area CalculatorRectangle, triangle or circle area.Circle CalculatorCalculate a circle's area, circumference and diameter from its radius.Exponent CalculatorCalculate a base number raised to a chosen power, plus its square and cube.Fraction CalculatorAdd, subtract, multiply, divide fractions. Step-by-step solution.LCM & GCF CalculatorLeast common multiple and greatest common factor. Prime factorization.
Days between dates, countdowns, ages and working days.
Age CalculatorPopularExact age in days, weeks and years. Days until next birthday.Days Between DatesPopularCalculate days, weeks, months between two dates.Age Difference CalculatorCalculate the age difference between two people in years, months and days from birth ye…Business Days From Today CalculatorFree business days from today calculator: find the date 5, 10 or any number of business daChronological Age CalculatorFree chronological age calculator: exact age in years, months and days from date of birth Days Ago CalculatorFree days ago calculator: find what date it was any number of days ago — 30, 60, 90 days or more
Materials, areas, volumes and garden planning.
Aquarium Volume CalculatorFree aquarium volume calculator: enter your tank dimensions in inches or cm and get US galConcrete Calculator — Bags NeededCalculate how much concrete or ready-mix bags you need for a pour.Cubic Yard CalculatorFree cubic yard calculator: enter length, width and depth to get cubic yards, cubic feet, Deck Screw CalculatorCalculate the number of deck or floor screws from area and screw density.Decking CalculatorCalculate the running metres and number of decking boards from deck size, board width a…Drywall CalculatorCalculate how many drywall sheets you need from wall or ceiling area.
Portions, baking ratios, drinks and party planning.
ABV Calculator — Homebrew Alcohol ContentCalculate the alcohol content (ABV) of your homebrew from original and final gravity (O…Alcohol Calorie CalculatorCalculate calories in beer, wine, cider and drinks.Alcohol Units CalculatorCalculate how many standard alcohol units your drink contains by volume and ABV.BBQ Meat CalculatorCalculate how much meat and sausage you need for a barbecue based on guests and appetite.Beer Quantity Calculator for PartiesCalculate how many beers you need for a party by guests, duration and pace.Caffeine Calculator — Daily Caffeine IntakeCalculate how much caffeine you get from coffee, tea and energy drinks per day.
Fuel, charging, travel time, emissions and weather feel.
Average Speed CalculatorCalculate your average speed from the distance travelled and the time it took.Car CO₂ Emissions CalculatorCalculate a car's annual CO₂ emissions from yearly mileage, fuel consumption and fuel t…Car Cost Calculator — True Monthly CostCalculate the true monthly cost of a car: fuel, insurance, tax, service and depreciation.Car Cost ComparisonCompare total costs of electric, petrol, diesel and leasing cars.Car Depreciation CalculatorCalculate a car's future value from an annual depreciation rate.Car Loan CalculatorMonthly car loan payment and total interest cost.
Discounts, tips, bills, unit prices and daily costs.
Tip CalculatorPopularCalculate tip and split the bill among multiple people.Budget CalculatorTrack income and expenses by category. Savings suggestions.Cost Per Day CalculatorCalculate the real cost per day or per use of a purchase.Discount Calculator — Sale Price & SavingsCalculate the discounted price and savings from a percentage discount.Shopping List CalculatorCreate a shopping list with prices, track budget and check off items.Split Bill CalculatorSplit a restaurant bill evenly among the group and add an optional tip.
Download times, storage, subnets, electricity and printing.
3D Print Cost CalculatorFree 3D print cost calculator: filament (by grams or length), electricity, printer depreciAspect Ratio CalculatorCalculate the missing dimension of an image or video while keeping the aspect ratio.Battery Life CalculatorEstimate a device's battery life from battery capacity (mAh) and current draw.Cloud Storage CalculatorCalculate how many photos, songs or videos fit in your storage based on average file size.Download Time CalculatorCalculate how long a file download takes based on file size and your connection speed.Electricity CalculatorCalculate home appliance electricity consumption and estimated bill.
GPA, grade targets, test scores and study planning.
GPA CalculatorPopularFree GPA calculator: enter your courses, letter grades and credit hours to calculate your Grade CalculatorPopularFree grade calculator: enter your assignment grades and weights to find your weighted clasCollege GPA CalculatorFree college GPA calculator: combine this semester’s grades with your existing cumulative Final Grade CalculatorFree final grade calculator: enter your current grade, the final exam weight and your targTest Grade CalculatorFree test grade calculator: enter how many questions you got right out of the total — see
Pricing, margins, valuations and AI cost estimates.
AI API Cost CalculatorGPT-4o vs Claude 3.5 vs Gemini — compare API costs by token.AI Business CalculatorCalculate AI ROI for your company: time savings and payback period.AI Job Risk CalculatorWill AI replace your job? Calculate risk by profession. Based on McKinsey research.AI Productivity CalculatorHow much do you save with ChatGPT, Copilot or Claude? Calculate ROI.Billing Rate CalculatorConvert salary target to hourly billing rate. Overheads and margin included.Business Valuation CalculatorEstimate company value using EBITDA multiple, revenue multiple, P/E and DCF.
How to choose
- Start with the question, not the formula
- Topics are grouped by what you are trying to decide — finance, health, dates, home projects — so you rarely need to know the name of the method.
- Check the units
- Most tools let you switch between metric and US units. Defaults are set for English-speaking users; the Finnish and Swedish sites use metric.