The TomatoAnswers tools are 74 free tomato calculators and planners that cover the whole growing year, from choosing a planting date to ripening the last fruit. Each one runs in your browser, needs no sign-up, and turns a common tomato question into a clear, personalized answer.
What Are the Tomato Tools?
The tomato tools are a free toolkit of calculators, checkers, planners, and converters for growing and using tomatoes. They answer the practical questions that come up each season, such as when to plant, how far apart to space, how much to water and feed, why leaves are spotting, and how big a harvest to expect. The figures draw on university extension and horticultural guidance, and every tool keeps your entries private in your own browser.
Planning & Planting Tools
Good tomatoes start with the right timing, site, and variety. These planners set your seed-starting and transplant dates, check whether a spot is warm and sunny enough, match a variety to your goals, work out how many plants to grow, and keep your beds on a healthy rotation.
Tomato Planting Date Calculator
Find your ideal seed-starting and transplant dates from your last spring frost.
Open tool →Fall Tomato Planting Calculator
Latest date to plant for a harvest before your first fall frost.
Open tool →Tomato Harvest Date Planner
Work back from the date you want ripe tomatoes.
Open tool →Tomato Growing Degree Days Calculator
Estimate days to maturity from your average temperatures.
Open tool →Tomato Seed Germination Calculator
How many days tomato seeds take to sprout at your soil temperature.
Open tool →Tomato Seed Starting Calculator
How many seeds to sow for the plants you want.
Open tool →Tomato Soil Temperature Checker
Is your soil warm enough to plant tomatoes yet?
Open tool →Tomato Seedling Pot-Up Checker
When to move seedlings into bigger pots, and how.
Open tool →Tomato Hardening-Off Scheduler
A day-by-day plan to acclimate seedlings before transplanting.
Open tool →Leggy Tomato Seedling Checker
Why seedlings stretch and how to fix and rescue them.
Open tool →Tomato Grow Light Distance Calculator
How high to hang a grow light over seedlings, by light type.
Open tool →Tomato Grow Light Cost Calculator
What your seedling lights cost to run for the season.
Open tool →Tomato Transplant Shock Checker
Wilting or pale after planting? Find the cause and fix.
Open tool →Tomato Transplant Depth Calculator
How much of the stem to bury, and whether to use the trench method.
Open tool →Tomato Seed Viability Checker
Whether old tomato seeds are still good, from age and storage.
Open tool →Tomato Temperature Checker
Check whether current temperatures are safe for planting or need frost protection.
Open tool →Tomato Sunlight Requirement Checker
Rate a spot for tomatoes from the hours of direct sun it gets.
Open tool →Determinate vs Indeterminate Tomato Chooser
Bush or vining? Five questions to pick the right type.
Open tool →Heirloom vs Hybrid Tomato Chooser
Flavor and seed saving or disease resistance? Seven questions.
Open tool →Tomato Variety Selector
Match a variety type to how you cook, where you grow, and your season.
Open tool →Tomato Plants Needed Calculator
Work out how many plants to grow to reach a harvest goal in pounds or jars.
Open tool →Tomato Plants Per Person Planner
How many plants to grow for your household and use.
Open tool →Tomato Crop Rotation Planner
See whether tomatoes can follow last season crops and what to plant next.
Open tool →Tomato Companion Planting Checker
Whether a plant is a good, cautious, or avoid neighbor for tomatoes.
Open tool →Spacing, Beds & Containers
Give every plant the room and soil it needs. These calculators space plants and rows, size a pot or a raised bed, estimate the soil and mulch to buy, and plan the support your row requires.
Tomato Plant Spacing Calculator
Get in-row and row spacing by variety and support, plus how many plants fit.
Open tool →Tomato Container Size Selector
Find the ideal pot size, width, and potting mix each variety needs.
Open tool →Raised-Bed Soil Volume Calculator
Cubic feet, yards, bags, and a tomato soil mix for your bed.
Open tool →Raised Bed Lumber Calculator
Boards, cut list, and real height for a raised bed.
Open tool →Tomato Stake Length Calculator
How tall your stakes should be, how deep, and how many ties.
Open tool →Tomato Trellis Calculator
Work out how much trellis or stake material and spacing your row needs.
Open tool →Tomato Mulch Calculator
Work out the cubic feet, yards, and bags of mulch to cover your bed.
Open tool →Soil, Feeding & Fertilizer
Feed the soil first, then the plant. These tools set your soil pH into the ideal range, work out how much fertilizer to apply, and time feeding from planting through harvest.
Tomato Soil Test Report Decoder
Turn your lab report into what to fix first and which fertilizer to buy.
Open tool →Tomato Soil pH Calculator
See how much lime or sulfur it takes to reach the ideal 6.0 to 6.8 pH.
Open tool →Tomato Fertilizer Calculator
Work out how much of your N-P-K fertilizer to apply by bed size or plant count.
Open tool →Tomato Feed Dilution Calculator
How much liquid feed to add to your watering can.
Open tool →Tomato Feeding Schedule Builder
Get a season-long feeding schedule by variety type and growing method.
Open tool →Watering & Irrigation
Water deeply and evenly to avoid cracking and blossom-end rot. These calculators find how much water tomatoes need each week and turn it into drip or soaker-hose run times.
Tomato Watering Calculator
Turn the weekly water target into gallons per plant, frequency, and per-session amounts.
Open tool →Tomato Overwatered vs Underwatered Checker
Wilting or yellow? Find out if it needs more water or less.
Open tool →Tomato Drip Irrigation Calculator
Turn your weekly water need into drip runtime in minutes per session.
Open tool →Tomato Self-Watering Container Calculator
How many days a reservoir lasts and when to refill.
Open tool →Tomato Hose Watering Time Calculator
Seconds per plant from a quick bucket test of your hose.
Open tool →Tomato Soaker Hose Calculator
Work out how long to run a soaker hose from your bed water and hose length.
Open tool →Tomato Rainfall Watering Calculator
How much more to water after rain, in inches and gallons.
Open tool →Tomato Rain Barrel Calculator
Rain your roof collects and how long it waters tomatoes.
Open tool →Plant Care & Protection
Keep plants healthy and productive through summer. These tools plan pruning, size shade cloth for heat, diagnose leaf, fruit, and pest problems, and match diseases to resistant varieties.
Tomato Pruning Guide
Get a pruning plan by variety, support, and goal, from stems to suckers.
Open tool →Tomato Shade Cloth Calculator
Get the shade percent and cloth size to protect tomatoes from heat.
Open tool →Tomato Fruit Set Temperature Checker
Whether day and night temps let flowers set fruit, or cause blossom drop.
Open tool →Tomato Frost Cloth Calculator
Fabric size, weight, and hoops to cover a bed before frost.
Open tool →Tomato Frost Protection Checker
Cover, harvest, or relax based on tonight low.
Open tool →Tomato Leaf Disease Detector
AI photo check for 9 leaf diseases and pests, private in your browser.
Open tool →Tomato Plant Problem Diagnosis
Match a leaf, fruit, or pest symptom to its likely cause and fix.
Open tool →Tomato Nutrient Deficiency Checker
Read yellow or purple leaves to find the missing nutrient.
Open tool →Tomato Leaf Curl Checker
Leaf roll, herbicide, virus, or mites: find why leaves curl.
Open tool →Tomato Fruit Problem Identifier
Cracks, black bottoms, scars, or spots: what it is and if it is safe to eat.
Open tool →Tomato Cracking Prevention Checker
Your fruit-splitting risk and how to prevent it.
Open tool →Tomato Sunscald Risk Checker
Your risk of pale, sun-damaged patches and how to prevent them.
Open tool →Tomato Blossom-End Rot Risk Checker
Your risk of the dark bottom patch and how to prevent it.
Open tool →Disease-Resistant Variety Matcher
Match a tomato disease to its resistance code and resistant varieties.
Open tool →Harvest, Kitchen & Conversions
Bring the crop in and make the most of it. These tools estimate your harvest, guide ripening and storage, scale recipes, plan a batch of sauce, and convert weights, cups, cans, and units.
Tomato Yield Per Plant Estimator
Estimate pounds, fruit count, and jars of sauce from your plants.
Open tool →Tomato Harvest Readiness Checker
Pick now, wait, or ripen indoors, by color stage and forecast.
Open tool →Tomato Ripening and Storage Guide
Get the best way to ripen or store tomatoes at every stage.
Open tool →Tomato Ripening Time Calculator
How many days green tomatoes take to ripen by temperature.
Open tool →Tomato Flower to Fruit Calculator
Days from flowering to a ripe tomato by type and weather.
Open tool →Tomato Measurement Converter
Convert tomato weights, cups, and can sizes for recipes, sauces, and canning.
Open tool →Garden Unit Converter
Convert fertilizer rate, area, and length between garden units.
Open tool →Tomato Recipe Converter
Scale a recipe by servings, or swap fresh and canned.
Open tool →Tomato Sauce Calculator
Pounds of tomatoes, and plants, for a batch of sauce.
Open tool →Tomato Paste Calculator
Paste yield from fresh tomatoes, thick or soft.
Open tool →Tomato Canning Yield Calculator
How many jars your harvest makes by product.
Open tool →Tomato Salsa Batch Calculator
Pounds of tomatoes, peppers, and onion for a batch of salsa.
Open tool →Tomato Canning Acid Calculator
Lemon juice or citric acid to add per jar, safely.
Open tool →Tomato Canning Time Calculator
USDA processing times by jar size, canner, and elevation.
Open tool →Dried Tomato Calculator
Fresh to dried pounds, drying time, and safe oil storage.
Open tool →Tomato Cost Calculator
See if growing your own beats buying, with your savings and cost per pound.
Open tool →How to Use the Tomato Tools Together
Most gardeners use several tools across a season. This is how they connect, stage by stage.
Which Tomato Tool Do You Need?
Start from your question and go straight to the tool that answers it.
| Your Question | Tool |
|---|---|
| When should I plant tomatoes? | Tomato Planting Date Calculator |
| How long do tomato seeds take to germinate? | Tomato Seed Germination Calculator |
| Are my old tomato seeds still good? | Tomato Seed Viability Checker |
| How high should my grow light be? | Tomato Grow Light Distance Calculator |
| How deep should I plant tomato seedlings? | Tomato Transplant Depth Calculator |
| How do I harden off tomato seedlings? | Tomato Hardening-Off Scheduler |
| What can I plant with tomatoes? | Tomato Companion Planting Checker |
| Is it warm enough to plant out? | Tomato Temperature Checker |
| Will frost kill my tomatoes tonight? | Tomato Frost Protection Checker |
| Does my spot get enough sun? | Tomato Sunlight Requirement Checker |
| Which variety should I grow? | Tomato Variety Selector, Disease-Resistant Variety Matcher |
| How many plants do I need? | Tomato Plants Needed Calculator |
| How many tomato plants per person? | Tomato Plants Per Person Planner |
| How far apart should I space plants? | Tomato Plant Spacing Calculator |
| What size pot does a tomato need? | Tomato Container Size Selector |
| How much soil for a raised bed? | Raised-Bed Soil Volume Calculator |
| How much fertilizer should I use? | Tomato Fertilizer Calculator, Tomato Feeding Schedule Builder |
| How much tomato feed per watering can? | Tomato Feed Dilution Calculator |
| How do I fix my soil pH? | Tomato Soil pH Calculator |
| How much and how often should I water? | Tomato Watering Calculator, Tomato Drip Irrigation Calculator, Tomato Soaker Hose Calculator |
| Do I need to water after rain? | Tomato Rainfall Watering Calculator |
| How should I prune this plant? | Tomato Pruning Guide |
| What is wrong with my tomato plant? | Tomato Plant Problem Diagnosis |
| Why do my tomatoes crack or split? | Tomato Cracking Prevention Checker |
| Why do my tomatoes get blossom-end rot? | Tomato Blossom-End Rot Risk Checker |
| Why won’t my tomatoes set fruit? | Tomato Fruit Set Temperature Checker |
| How big a harvest can I expect? | Tomato Yield Per Plant Estimator |
| What is wrong with my tomato fruit? | Tomato Fruit Problem Identifier |
| When should I plant to have tomatoes by a certain date? | Tomato Harvest Date Planner |
| Why are my tomato seedlings leggy? | Leggy Tomato Seedling Checker |
| How much frost cloth do I need for my tomatoes? | Tomato Frost Cloth Calculator |
| How often do I refill a self-watering tomato planter? | Tomato Self-Watering Container Calculator |
| When should I pot up tomato seedlings? | Tomato Seedling Pot-Up Checker |
| Is my soil warm enough to plant tomatoes? | Tomato Soil Temperature Checker |
| Why are my new tomato transplants wilting? | Tomato Transplant Shock Checker |
| Should I grow determinate or indeterminate tomatoes? | Determinate vs Indeterminate Tomato Chooser |
| Should I grow heirloom or hybrid tomatoes? | Heirloom vs Hybrid Tomato Chooser |
| How tall should tomato stakes be? | Tomato Stake Length Calculator |
| How long should I water tomatoes with a hose? | Tomato Hose Watering Time Calculator |
| What disease does my tomato leaf have? | Tomato Leaf Disease Detector |
| When should I plant tomatoes for a fall harvest? | Fall Tomato Planting Calculator |
| Is my tomato overwatered or underwatered? | Tomato Overwatered vs Underwatered Checker |
| Why are my tomato leaves curling? | Tomato Leaf Curl Checker |
| How do I read my soil test results? | Tomato Soil Test Report Decoder |
| When should I pick my tomatoes? | Tomato Harvest Readiness Checker |
| Why are my tomato leaves yellow or purple? | Tomato Nutrient Deficiency Checker |
| Is it cheaper to grow my own tomatoes? | Tomato Cost Calculator |
| How do I ripen green tomatoes? | Tomato Ripening and Storage Guide |
| How long from flower to ripe tomato? | Tomato Flower to Fruit Calculator |
| How long do green tomatoes take to ripen? | Tomato Ripening Time Calculator |
| How many pounds is a cup of tomatoes? | Tomato Measurement Converter, Garden Unit Converter |
| How many jars will my tomato harvest make? | Tomato Canning Yield Calculator |
| Will my variety ripen in my climate? | Tomato Growing Degree Days Calculator |
| Why do my tomatoes get pale, sunburned patches? | Tomato Sunscald Risk Checker |
| How many tomatoes do I need for salsa? | Tomato Salsa Batch Calculator |
| How many tomato seeds should I sow? | Tomato Seed Starting Calculator |
| How much lemon juice or acid for canning tomatoes? | Tomato Canning Acid Calculator |
| How long do I process canned tomatoes? | Tomato Canning Time Calculator |
| How many fresh tomatoes make dried tomatoes? | Dried Tomato Calculator |
| How many tomatoes do I need for paste? | Tomato Paste Calculator |
| How much rain will my rain barrel catch? | Tomato Rain Barrel Calculator |
| How much do grow lights cost to run? | Tomato Grow Light Cost Calculator |
| How much lumber do I need for a raised bed? | Raised Bed Lumber Calculator |
How the Tools Work
Each tool takes a few inputs, applies a documented rule or formula, and returns a result you can act on. The methods and reference figures come from university extension services and horticultural bodies, including Iowa State University Extension, the Royal Horticultural Society, and The Old Farmer’s Almanac. The tools give sound planning estimates, not guarantees; for the most precise numbers, a soil test and your local extension office are the best guide. Content is reviewed by Aiza Anwar. Last reviewed September 24, 2026.
Tomato Tools FAQs
What tomato tools are available?
There are 74 free tools covering the whole season: planting date, temperature, sunlight, and variety selection; spacing, container and bed sizing, soil volume, trellis, and mulch; soil pH, fertilizer, and feeding; watering, drip, and soaker-hose timing; pruning, shade cloth, problem diagnosis, and disease-resistant matching; and yield, ripening and storage, plus measurement, garden-unit, recipe, and sauce tools.
Are the tomato tools free?
Yes. Every tool is completely free to use, with no sign-up, subscription, or download required.
Do the tools work on mobile?
Yes. All 74 tools are mobile-friendly and run directly in your phone, tablet, or desktop browser.
Do I need an account or an app?
No. The tools run in your browser, and your entries stay on your device. Nothing is sent to a server or saved to an account.
How accurate are the tomato calculators?
They give reliable planning estimates based on extension and horticultural guidance. Real results vary with your variety, soil, and weather, so treat them as a strong starting point rather than a guarantee; a soil test gives the most precise figures.
Which tomato tool should a beginner start with?
Start with the planting date calculator, the variety selector, the plant spacing calculator, and the watering calculator. Together they cover timing, choice, layout, and care for a first crop.
Can I use these tools for other vegetables?
Several general ones help with any crop, including the spacing, soil volume, mulch, watering, and garden-unit tools. The variety, disease-resistance, and yield tools are tomato-specific.
Are the tools based on reliable sources?
Yes. The methods and figures follow university extension services, the Royal Horticultural Society, and The Old Farmer’s Almanac, and the content is reviewed by Aiza Anwar.
How often are the tools updated?
The tools are maintained and reviewed for accuracy. The current set was last reviewed on September 24, 2026, and new tools are added over time.
Explore tomato guides: Growing · When to Plant · Varieties · Problems & Solutions · Recipes · Preserving · Nutrition · FAQs