Browse public calculations, notebooks, and spreadsheet-style sheets created by the Numbox community. Unit-aware math you can open and edit.
Battery pack designer: Input · Value · Cell voltage · 3.6 V · Cell capacity · 3000 mAh · Series cells · 3 · Parallel cells · 2 · Load…
Savings growth: Input · Value · Start amount · 5000 EUR · Monthly saving · 200 EUR · Yearly return · 5% · Year · Balance · Interest earned…
Appliance energy cost: Appliance · Power · Daily use · Annual energy · Annual cost · Fridge · 45 W · 8 h · = B2 * C2 * 365 to kWh · = D2 *…
Freelance project estimate: Task · Hours · Hourly rate · Cost · Design · 12 · 80 EUR · = B2 * C2 · Development · 46 · 95 EUR · = B3 * C3 ·…
Unit price comparison: Product · Price · Amount · Price / l · Olive oil, small · 8.90 EUR · 750 ml · = B2 / C2 to EUR / l · Olive oil,…
Off-Grid Solar for Camper or Garden House: {"type":"doc","attrs":{"background":{"dim":11,"id":"aurora"}},"content":[{"type":"heading","attr…
Home Battery Size and Payback: {"type":"doc","attrs":{"background":{"dim":35,"color":"#0f0e11","url":"https://images.unsplash.com/photo-176…
DC Cable Size and Voltage Drop: {"type":"doc","attrs":{"background":{"dim":11,"id":"none"}},"content":[{"type":"heading","attrs":{"level":1…
Battery Runtime Calculator: {"type":"doc","attrs":{"background":{"dim":27,"url":"https://images.unsplash.com/photo-1555664424-778a1e5e1b48?…
Electric Car Payback vs Petrol Car: {"type":"doc","attrs":{"background":{"dim":28,"url":"https://images.unsplash.com/photo-1671785120538-c2…
Fact Check: CO2 Over the Lifetime, EV vs Petrol Car: {"type":"doc","attrs":{"background":{"dim":33,"url":"https://images.unsplash.com/photo…
From yearly electricity use to system size, number of modules, roof area and cost. Deutsch: Von deinem Jahresverbrauch zur Anlagengröße,…
Yield, savings and payback time of a plug-in solar system. Change modules, price and self-use share. Deutsch: Rechne mit eigenen Werten,…
Start from your monthly budget and work backwards to the maximum loan and home price.
Rough estimate of a reverse mortgage: loan limit, growing debt, remaining equity and monthly payout. Illustration only.
Monthly payment, total interest and the effect of an extra monthly payment. Change the inputs, results update.
boat motor test: small outboat motor and some batteries test calcs to see how much power we could generate and how much we probably would…
What if you used a microwave as a snowblower? xkcd's What If?: original: https://www.youtube.2com/2shorts/DDNMLh1I_jY --- Inputs &…
Reverse Mortgage Template (What can I afford?): REVERSE MORTAGE: What can I afford? Calculate maximum home price based on a target monthly…
Loan and Mortgage Calculator Template: Loan & Mortgage Calculator Calculate monthly payments, total interest, and total cost of a loan.…
555 Retriggerable Timing Resistor Calculation: console.log(getResistorForTime(1)); // → "273.1" (≈ 273 kΩ for 1 minute)…
esp32 c6 battery consumption: esp32 c6 consumption test the current fullBatteryCapacity = 3.6 V * 2510 mAh
Fact Check: DE 100% Solar: Let's calculate how much area Germany would need to be 100% solar powered === base assumptions from Elon's post…
Solar Bike Viability Estimation: solarbike average bikeBatteryCapacity bikeBatteryCapacity = 460 Wh
Bread Recipe With Math: This recipe needs quite some time, but it is simple and needs only _2 minutes_ of kneading. how much flower do you…
6V Solar Panel Calculations: electricity production with cloudy weather blackSquare = 0.9 mA * 1.1 V blueRectangle = 1 mA * 1 V
Fact Check: 100% USA Solar: Let's use numbox to check a real life example === start of Elons posts ===…