Free Calculator Widgets for Your Website

Monthly instalment, total interest and total repayment for any loan.

Payment, total interest and payoff date for any loan, with monthly, biweekly or weekly payments.

Monthly mortgage payment with property tax, insurance, HOA dues and PMI broken out.

Future value of a lump sum and monthly contributions at any compounding frequency.

Estimated value of a monthly SIP, with an optional yearly step-up.

Simple interest and total amount for a period in years, months or days.

Fixed deposit maturity value, or the monthly or quarterly interest payout.

Projected retirement savings against what an inflation-linked income needs.

How much to save each month to reach a goal by a date, counting interest.

What something will cost in future, and what today's cash will be worth, at a rate you choose.

Compound annual growth rate between a starting and an ending value.

Return on investment as a percentage, plus the annualised figure when you add the period.

How long a card balance takes to clear and what it costs, or the payment to clear it by a date.

Avalanche versus snowball for up to five debts: months to debt-free and total interest.

The home price an income supports under the 28/36 debt-to-income rule.

Compare net worth after renting or buying over the years you plan to stay.

Gross and net rental yield after vacancy and running costs.

Capitalization rate from income and price, or the value at a target cap rate.

Down payment, loan amount, LTV and total cash needed to buy a home.

Maximum home-loan EMI and loan amount from net income using the FOIR method.

Total floor area of up to six rectangles, circles and triangles in sq ft and square metres.

Paint needed for a room after doors and windows, rounded up to real can sizes.

Profit, gross margin and markup from cost and price - or the price for a target margin.

Selling price from cost plus markup, or work back to the cost or the markup you applied.

Sale price and savings, including stacked discounts and sales tax on the reduced price.

Units and revenue needed to cover fixed costs, plus the sales needed for a profit target.

Add or remove Indian GST at the rate you choose, split into CGST + SGST or IGST.

Add VAT to a net price or extract it from a gross price, at a UK rate or any rate you type.

US-style sales tax from the state and local rates you enter, or the tax hidden in a tax-inclusive total.

Tip, total and each person's share of a bill, with an option to round shares up.

What you receive after a percentage-plus-fixed processing fee, or what to charge to receive a set amount.

Minimum hourly and day rate from the income you want, your costs, tax and billable hours.

Return on ad spend as a multiple and a percentage, with break-even ROAS from your margin.

Solve CPM, campaign cost or impressions from the other two.

Cost per click plus CTR, CPM, conversion rate and CPA from one campaign's totals.

Conversion rate from visitors and conversions, with an optional A/B comparison and z-test.

Social media engagement rate by followers and by reach, for one post or several.

Network, broadcast, host range, masks and host count for any IPv4 CIDR, with subnet splitting.

Reading and speaking time for a word count or pasted text, at research-based reading speeds.

Enter any two of voltage, current, resistance and power to get the other two.

Watts, volt-amps and amps for DC and single-phase AC circuits, with power factor.

kW, kVA and kVAR from line voltage, current and power factor - or the current from kW or kVA.

Volts and percent lost along a copper or aluminium cable, for DC, single-phase and three-phase runs.

Output voltage of a two-resistor divider, or the R2 needed for a target voltage, with an optional load.

Series resistor for one LED or a string: standard E12/E24 value, real current and power rating.

Equivalent of up to 8 resistors or capacitors in series or in parallel.

kVA, kVAR and phase angle from kW and power factor, plus the capacitor kVAR to reach a target.

How long a battery runs a load, from Ah, voltage, depth of discharge and efficiency.

Backup time of a home inverter or UPS battery bank, or the battery Ah needed for the hours you want.

Panels and system kW needed to cover your energy use, from your own peak sun hours.

Daily, monthly and yearly running cost of up to 8 appliances at your tariff.

X% of Y, X as a percent of Y, and the percentage change between two values.

A clean on-screen calculator with keyboard support, correct operator precedence and percent.

Trig in degrees or radians, logs, roots, powers, factorials, pi, e and Ans - typed or tapped.

Add, subtract, multiply and divide fractions and mixed numbers, with the simplified answer.

Mean, median, mode, range, variance, standard deviation and quartiles of any list of numbers.

Credit-weighted GPA for a term, plus the new cumulative GPA when you add prior results.

The score you need on the final exam to reach a target grade, plus best and worst cases.

Real or complex roots of ax^2 + bx + c = 0, with the discriminant, vertex and axis of symmetry.

Exact age in years, months and days, totals in months, weeks and days, and the next birthday.

Years, months and days between two dates or date-times, plus totals in days, weeks and hours.

Count working days between dates or add N business days, with your weekend and holidays.

Sunrise, sunset, solar noon, day length and twilight for any place and date.

Fajr, Sunrise, Dhuhr, Asr, Maghrib and Isha for any place, with the major calculation methods.

Fuel needed and trip cost from distance, economy and fuel price, split between passengers.

Monthly car payment with down payment, trade-in, sales tax and fees, plus the total cost.

Cost and energy to charge an electric car between two battery levels, with charging losses.

Diameter, sidewall and revolutions of a tyre size, and the speedometer error of a new size.

Solve speed, distance or time from the other two, in km, miles, metres or nautical miles.

Trip total, per person and per day from stay, food, transport, activities, flights and a buffer.

A car's estimated value year by year, by declining balance or straight line.

Body mass index with the WHO adult category and the healthy weight range for a height.

Basal metabolic rate from Mifflin-St Jeor or the revised Harris-Benedict equation.

Maintenance calories (TDEE) and daily targets for gradual weight loss or gain.

Body fat percentage from tape measurements with the US Navy method, plus ACE category.

Devine, Robinson, Miller and Hamwi ideal weights side by side, with the healthy BMI range.

An estimated daily fluid range from body weight and exercise time, from published guidance.

Daily grams of protein, carbohydrate and fat from calories and a macro split.

Estimated due date, weeks pregnant, trimester and key dates from LMP, conception or IVF.

Estimated ovulation day and fertile window for the next three cycles.

Estimated max heart rate and five training zones, with optional Karvonen zones.

Pace per km and per mile from distance and time, or finish time from a target pace.

Estimated 1RM from a set of 1-12 reps by Epley and Brzycki, with a training-load table.

Simplify width x height to a ratio and resize to a new width or height without distortion.