Calculators
19 toolsTrueScalers publishes 16 free calculators covering mortgages, loans, compound interest, percentages, sales tax, BMI, daily calories, body fat, age and grades. Every calculator shows the formula it applies, defines each variable, and computes entirely inside the browser, so no financial or health figure is ever transmitted.
Finance, health, date and academic calculators. Each page states the formula, defines every variable, and cites the authority the method comes from.
Percentage calculator
Calculate a percentage of a number, percentage change, percentage increase or decrease, and reverse percentages. Free, instant, and shows the formula used.
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Mortgage calculator
Calculate a monthly mortgage payment from price, deposit, rate and term, including property tax and insurance. Shows total interest and the formula used.
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Loan calculator
Calculate the monthly payment, total interest and payoff schedule for any fixed-rate loan. Add an extra monthly payment to see the interest saved.
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Car payment calculator
Work out a monthly car payment from price, down payment, trade-in, APR and term. Includes sales tax and shows total interest paid over the loan.
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Compound interest calculator
Calculate compound growth with regular contributions. Choose daily, monthly, quarterly or annual compounding and see the interest earned separately.
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Savings goal calculator
Find the monthly deposit needed to reach a savings target by a chosen date, accounting for interest earned on the balance along the way.
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Tip calculator
Calculate a tip and split a restaurant bill between any number of people. Round each share up to the nearest dollar with one tap.
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Discount calculator
Calculate a sale price, the amount saved, and stacked discounts. Handles a second discount at the till plus sales tax on the final price.
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Sales tax calculator
Add sales tax to a pre-tax price, or extract the tax already included in a total. Works for US sales tax, VAT and GST at any rate.
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BMI calculator
Calculate body mass index in metric or imperial units, see the WHO category, and get the healthy weight range for your height.
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Calorie calculator
Calculate your basal metabolic rate and daily calorie needs with the Mifflin-St Jeor equation, plus targets for weight loss and lean gain.
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Body fat calculator
Estimate body fat percentage from neck, waist and hip measurements using the US Navy circumference method. Includes fat mass and lean mass.
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Age calculator
Calculate exact age in years, months and days from a date of birth, plus total days lived, day of the week born, and days until the next birthday.
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Date duration calculator
Find the duration between two dates in days, weeks, fortnights and months, with the weekday, weekend and working-day split for any period.
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Weeks between dates calculator
Count the weeks between two dates, with the fractional week, whole weeks plus days, fortnights, full weekends and five-day working weeks.
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Grade calculator
Find your course grade so far and the exact score needed on the remaining work to finish at the overall grade you are targeting.
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Weighted grade calculator
Work out a weighted average mark from assessments carrying different weightings, and see exactly how many points each one contributes.
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Average grade calculator
Average a list of grades with no weightings. Paste scores one per line or comma-separated for the mean, median, range and letter grade.
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GPA calculator
Calculate term and cumulative GPA on the 4.0 scale from letter grades and credit hours. Accepts letters or numeric grade points.
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Other categories
Last reviewed: · How every formula is derived